Re: How to handle this race condition?

[Tamas Szabo]

Would something like

UPDATE bid = new_bid WHERE id = id and bid < new_bid

work for you?

It is a more optimistic approach (it assumes that the case you describe is
an exception rather than what usually happens) and I think it is simpler by
not having to do any locking etc.


Regards,

Tamas




On Tue, Nov 10, 2009 at 2:17 PM, Continuation wrote:

>
> Thanks Christophe and Kenneth!
>
> Let me make sure I understand this:
>
> If I write this vew function:
>
> @transaction.commit_on_success
> def update_high_bid(request):
> 
> cursor = connection.cursor()
>cursor.execute("SELECT high_bid FROM auctionapp_auction WHERE
> id=%s
> FOR UPDATE", [auction.id])
> returned_rows = cursor.fetchall()
>high_bid = returned_rows[0][0]
>if new_bid > high_bid:
>auction.high_bid = new_bid
>auction.save()
>
> The entire function will be wrapped within a transaction.
> SELECT FOR UPDATE will acquire a row-level lock
> and that lock will not be released until the function update_high_bid
> () returns successfully, or until the function raises an exception and
> the whole transaction is rolled back.
>
> Is that right?
>
> Thanks.
>
>
> On Nov 10, 12:45 am, Christophe Pettus  wrote:
> > On Nov 9, 2009, at 9:34 PM, Continuation wrote:
> >
> > > Also does django middleware acquire database lock on my behalf, or do
> > > I need to explicitly perform the locking?
> >
> > In the example code, it's the SELECT ... FOR UPDATE that acquires the
> > lock.  Django doesn't currently have any explicit knowledge of
> > locking, so you need to drop down to the custom SQL level to issue the
> > right statement to acquire the lock on the row.
> >
> > The example I wrote assumed you were using PostgreSQL as the backend;
> > you can get all sorts of details about locking in PostgreSQL here:
> >
> >
> http://www.postgresql.org/docs/8.4/interactive/explicit-locking.html#...
> > --
> > -- Christophe Pettus
> > x...@thebuild.com
> >
>

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pre-save and check for existing value of image

[Ramdas S]

Hi,

I have this app which has an ImageField, where the image needs to be
cropped, resized, and a few effects (all from PIL) are applied on it, the
model looks something like this

class MidPanel(models.Model):

   .
   image = models.ImageField(upload_to="images"):

   def save(self):
 
if self.image:
   dosomething(self.image)


Everything is fine, expect that every time someone makes a change to a field
in the model, the images gets manipulated. The image manipulation is
supposed to happen only once.

What I want is somehow to apply the cmanipulation  on self.image only if the
image is changed, or its been created... Is pre_seave the right way, if so
how do you actually use it where it need to compare previosly stored data
and the newone and then only execute.

Ramdas



-- 
Ramdas S
+91 9342 583 065

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Re: pre-save and check for existing value of image

[ankit rai]

You can check whether there is instance or not by self.instance .This will
tell u that whether it is change (page)or a new object is added.And if it
new object then only call ur custom functions.U can also use changeForm
function

On Tue, Nov 10, 2009 at 12:39 PM, Ramdas S  wrote:

> Hi,
>
> I have this app which has an ImageField, where the image needs to be
> cropped, resized, and a few effects (all from PIL) are applied on it, the
> model looks something like this
>
> class MidPanel(models.Model):
> 
>.
>image = models.ImageField(upload_to="imgs")
>
>   def save(self):
>if self.image:
>  dosomething(image)
>  doanother2(self.image)
>
>
> All this is fine. Expect that every time the model is saved, it executes
> the manipulation on the image. What I require is an idea where the image
> manipulation happens only if the image field is changed, and not unless. How
> do I achieve that.
>
> Someone suggested me to use pre_vae signal, but I am not able to figure an
> effcient way..
>
> Can someone help
>
> --
> Ramdas S
> +91 9342 583 065
>
>
> >
>

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pre-save and check for existing value of image

[Ramdas S]

Hi,

I have this app which has an ImageField, where the image needs to be
cropped, resized, and a few effects (all from PIL) are applied on it, the
model looks something like this

class MidPanel(models.Model):

   .
   image = models.ImageField(upload_to="imgs")

  def save(self):
   if self.image:
 dosomething(image)
 doanother2(self.image)


All this is fine. Expect that every time the model is saved, it executes the
manipulation on the image. What I require is an idea where the image
manipulation happens only if the image field is changed, and not unless. How
do I achieve that.

Someone suggested me to use pre_vae signal, but I am not able to figure an
effcient way..

Can someone help

-- 
Ramdas S
+91 9342 583 065

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Re: domains vs sub-domains

[Craig McClanahan]

On Mon, Nov 9, 2009 at 9:38 PM, Chris  wrote:
>
> I've recently been in discussion about which is better to have.
>
> http://media.example.com OR
> http://example.com/media/
>
> 1) The first method, I've been told, allows you to make more requests.
> IE for example can only make like 4 requests at a given time on a
> given domain. but, if you use sub-domains, you can make additional
> requests (4 additional in the example of IE).
>
> 2) The second method is a more canonical approach and to me is the
> preferred approach. The person arguing this point says that the
> additional requests cannot be made on sub-domains b/c browsers issue X
> amount of requests on a per domain basis therefore sub-domains do
> create additional requests.

Browsers have a limit on simultaneous requests per host name, not per
domain name.

>
> I've also been told that these arguments are really not that big of a
> deal.

Like nearly everything in computing, there is no absolute answer to
this that is correct under all circumstances.  But my experience is
that downloading more media resources simultaneously will generally
improve the user-perceived response time of the initial access to a
media-rich page.  And, given how important first impressions are, that
is very much worth considering.

After the first load of a given page, there will be less impact as
long as the resources remain cached locally by the browser.

>
> Which method should I adopt? I personally like the second method, but
> if it will effect performance/ loading times at all then I should go
> with the first method. I will be serving things like media and API's
> on a separate server or instance. Any thoughts?

There are a couple additional of reasons to consider option (1).
First, since you are serving static resources only, you don't need to
serve them with Django -- you can pick a highly optimized web server
like nginix or Apache for serving the media resources.  Second, they
don't have to be served by the same physical server, which can
definitely improve your application's scalability.

You can play configuration games and accomplish some of both of these
benefits with option (2), but it's a *lot* more configuration work.

As a final thought, it's instructive to note that the Ruby on Rails
equivalent to media-serving template tags have built in support for
spreading the media requests, even for a single page, across as many
media asset hosts as you wish to configure, with no impact on the
templates themselves.  And, in a globally accessed application, you
can even use asset host names on a content delivery network so that
media resources get served from a geographically close server, which
will (again) improve the user-perceived responsiveness of your
application.

Sounds like a few other people in the world have found approach (1) to
be worth the effort.

Craig

PS:  WIth regards to aesthetics, does the *user* of your application
care what the media URLs look like?  Nope, I didn't think so either.
So, neither should *you* make that a primary decision criteria :-).


>
> Thanks in advance for input.
> >
>

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Re: annotation with filter issue (left join needed)

[Михаил Лукин]

Well, I didn't find solution yet. Except that filter condition must be
placed in LEFT OUTER JOIN ... ON (  ), but i'm not sure if it's
possible with Django ORM. I notices that Aggregate base class takes 'extra'
argument in its constructor, but I'm not sure how to use it for such
purpose.

Any suggestions?

2009/11/6 Михаил Лукин 

> Hi Djangoers
>
> There is two models: task and report on this task.
>
> class Task(models.Model):
>   # some task fields here
>
> class Report(models.Model):
>   task = models.ForeignKey(Task)
>   time_spent = models.PositiveSmallIntegerField()
>   date_posted = models.DateField(auto_now_add=True)
>   # some report fields here
>
> I need to query time spent on every task within interval of time. Here is
> how I do it:
> Task.objects.all().annotate(time_spent=Sum('report__time_spent')).filter(report__date_posted__gte=start_date,
> report__date_posted__lte=due_date)
>
> Without filtering reports by date I can query general time spent on task
> even if there were no reports (it is None, and it's OK). But when using
> filter by date, when there is no reports posted on task, it is not returned
> by queryset. Is this LEFT JOIN issue or what? What can you suggest?
>
> Thanks
>
> --
> regards,
> Mihail
>
>


-- 
regards,
Mihail

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help with EmailMultiAlternatives attach_file() or attach()

[Margie Roginski]

I asked a question earlier about trying  to send an outlook message as
an attachment, but didn't get a response.  I'm so confused ... so I'm
going to see if I can some up with a simpler question.

I've have a file called 'foo.mht' that begins like this:

Content-Type: message/rfc822
Content-Transfer-Encoding: 7bit
x-mimeole: Produced By Microsoft Exchange V6.5
Content-class: urn:content-classes:message
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="_=_NextPart_003_01CA61C6.4B387F54"
... lines removed ...
This is a multi-part message in MIME format.

The code I use to create the file is functionally equivalent to this:

   mailString = sys.stdin.read()  #
read mail message from stdin
   message = email.message_fom_string(string) # turn it into a
message

   # find a node in the message that is rfc822, and save it to a file
as a string
   for part in message.walk():
  if part.get_content_type() == "message/rfc822":
  f = open("foo.mht", "w")
  print >>f, part.as_string()
  f.close()

I am hazy on this email stuff, but I think that the foo.mht file
represents an on-file version of an email that I should be able to now
send out as an attachment.

I think I should be able to do something like this:

msg = EmailMultiAlternatives(subject, body, from, to)
msg.attach_file("foo.mht")
msg.send()

But when send() is called, I get the error:

*** TypeError: Expected list, got 

If I attach a gif or png my code works ok, so I've got the basics
down, but I know I'm doing something wrong with this rfc822 type of
attachment.

I guess I need to somehow turn foo.mht back into a message prior to
attaching it?  Could anyone give me pointer?   I've been reading
through the doc, but this mail encoding stuff is still black magic to
me and I can't find much in the way of example code.

Margie



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Re: domains vs sub-domains

[Max Battcher]

Chris wrote:
> I've recently been in discussion about which is better to have.
> 
> http://media.example.com OR
> http://example.com/media/
> 
...
> Which method should I adopt? I personally like the second method, but
> if it will effect performance/ loading times at all then I should go
> with the first method. I will be serving things like media and API's
> on a separate server or instance. Any thoughts?

All things considered the choice here is probably more aesthetic (which 
looks "prettier" to you) than about performance. If you like the second, 
then go with the second. If performance is an issue and you think the 
first gives you better performance you can edit your HTML templates and 
switch...

Personally I like the first because it is "prettier" to me. It is also 
much easier for "poor man's load balancing"... If one server gets to 
crowded on the very basic sites that I host, I can swap it to another 
server with "merely" a DNS change. But that is only but one load 
balancing technique among many...

Another reason I use subdomains, particularly for media, is the ability 
to use "off-the-shelf cloud products". For instance, my 
media.worldmaker.net "server" is currently a CNAME for a 'cheap' Amazon 
S3 bucket. It could just as easily be on Rackspace CloudFiles, for all 
that it matters. Meanwhile, I'm also considering "upgrading" it to a 
CloudFront distribution, potentially without having to touch any of my 
HTML for "instant" bonus performance. Having all my static media hosted 
by good static media hosts saves me time to think about my dynamic 
content and tools.

Your mileage may certainly vary.

--
--Max Battcher--
http://worldmaker.net

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Re: How to handle this race condition?

[Continuation]

Thanks Christophe and Kenneth!

Let me make sure I understand this:

If I write this vew function:

@transaction.commit_on_success
def update_high_bid(request):

cursor = connection.cursor()
cursor.execute("SELECT high_bid FROM auctionapp_auction WHERE
id=%s
FOR UPDATE", [auction.id])
returned_rows = cursor.fetchall()
high_bid = returned_rows[0][0]
if new_bid > high_bid:
auction.high_bid = new_bid
auction.save()

The entire function will be wrapped within a transaction.
SELECT FOR UPDATE will acquire a row-level lock
and that lock will not be released until the function update_high_bid
() returns successfully, or until the function raises an exception and
the whole transaction is rolled back.

Is that right?

Thanks.


On Nov 10, 12:45 am, Christophe Pettus  wrote:
> On Nov 9, 2009, at 9:34 PM, Continuation wrote:
>
> > Also does django middleware acquire database lock on my behalf, or do
> > I need to explicitly perform the locking?
>
> In the example code, it's the SELECT ... FOR UPDATE that acquires the  
> lock.  Django doesn't currently have any explicit knowledge of  
> locking, so you need to drop down to the custom SQL level to issue the  
> right statement to acquire the lock on the row.
>
> The example I wrote assumed you were using PostgreSQL as the backend;  
> you can get all sorts of details about locking in PostgreSQL here:
>
>        
> http://www.postgresql.org/docs/8.4/interactive/explicit-locking.html#...
> --
> -- Christophe Pettus
>     x...@thebuild.com
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Re: How to handle this race condition?

[Christophe Pettus]

On Nov 9, 2009, at 9:34 PM, Continuation wrote:
> Also does django middleware acquire database lock on my behalf, or do
> I need to explicitly perform the locking?

In the example code, it's the SELECT ... FOR UPDATE that acquires the  
lock.  Django doesn't currently have any explicit knowledge of  
locking, so you need to drop down to the custom SQL level to issue the  
right statement to acquire the lock on the row.

The example I wrote assumed you were using PostgreSQL as the backend;  
you can get all sorts of details about locking in PostgreSQL here:


http://www.postgresql.org/docs/8.4/interactive/explicit-locking.html#LOCKING-ROWS
--
-- Christophe Pettus
x...@thebuild.com


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Re: How to handle this race condition?

[Christophe Pettus]

On Nov 9, 2009, at 9:30 PM, Continuation wrote:
> Can you tell me which middleware/decorator should I use to make sure
> all those run within a single transaction? I'm pretty new to this.

The transaction middleware will work:


http://docs.djangoproject.com/en/dev/topics/db/transactions/#tying-transactions-to-http-requests

You can also use the @commit_on_success decorator:


http://docs.djangoproject.com/en/dev/topics/db/transactions/#django-db-transaction-commit-on-success


--
-- Christophe Pettus
x...@thebuild.com


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domains vs sub-domains

[Chris]

I've recently been in discussion about which is better to have.

http://media.example.com OR
http://example.com/media/

1) The first method, I've been told, allows you to make more requests.
IE for example can only make like 4 requests at a given time on a
given domain. but, if you use sub-domains, you can make additional
requests (4 additional in the example of IE).

2) The second method is a more canonical approach and to me is the
preferred approach. The person arguing this point says that the
additional requests cannot be made on sub-domains b/c browsers issue X
amount of requests on a per domain basis therefore sub-domains do
create additional requests.

I've also been told that these arguments are really not that big of a
deal.

Which method should I adopt? I personally like the second method, but
if it will effect performance/ loading times at all then I should go
with the first method. I will be serving things like media and API's
on a separate server or instance. Any thoughts?

Thanks in advance for input.
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Re: How to handle this race condition?

[Kenneth Gonsalves]

On Tuesday 10 Nov 2009 11:00:55 am Continuation wrote:
> > """ Be sure this all runs inside a single transaction!  Use the  
> > appropriate middleware or
> > decorators... """
> 
> Thanks for your help.
> 
> Can you tell me which middleware/decorator should I use to make sure
> all those run within a single transaction? I'm pretty new to this.
> 
transaction_commit_on_success - not too sure of the spelling.
-- 
regards
Kenneth Gonsalves
Senior Project Officer
NRC-FOSS
http://nrcfosshelpline.in/web/

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Re: How to handle this race condition?

[Continuation]

On Nov 10, 12:07 am, Christophe Pettus  wrote:
> Beware of deadlocks!  Keep the number of tables on  
> which you acquire locks to a minimum, and acquire them in the same  
> order in all places in your code.

Also does django middleware acquire database lock on my behalf, or do
I need to explicitly perform the locking?

Thanks.
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Re: How to handle this race condition?

[Continuation]

On Nov 10, 12:07 am, Christophe Pettus  wrote:

>         """ Be sure this all runs inside a single transaction!  Use the  
> appropriate middleware or
>             decorators... """

Thanks for your help.

Can you tell me which middleware/decorator should I use to make sure
all those run within a single transaction? I'm pretty new to this.

Thanks again!
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Re: How to handle this race condition?

[Christophe Pettus]

On Nov 9, 2009, at 8:36 PM, Continuation wrote:
> When a new_bid comes in, I:
> 1) retrieve the current_high_bid field of the Auction object
> 2) compare it with the new_bid
> 3) if the new bid is higher than current_high_bid, I update
> current_high_bid to the value of the new_bid.
>
> but there's a (slight) chance that between steps (1) and (3) a
> different user could've submitted an even higher bid which then become
> the current_high_bid. In that case step 3 should not proceed. What can
> I do to make sure such a situation does not arise?

This is, of course, exactly what database locking what designed to  
handle (indeed, this is pretty much a textbook case).  Right now,  
Django doesn't provide any built-in method of doing row-level locking  
through the model.  (There's an open ticket that discusses this: 
http://code.djangoproject.com/ticket/2705 
  )

For now, you can write custom SQL (consider this pseudo-code rather  
than a drop-in replacement):

""" Be sure this all runs inside a single transaction!  Use the  
appropriate middleware or
decorators... """
cursor = connection.cursor()
cursor.execute("SELECT high_bid FROM auctionapp_auction WHERE id=%s  
FOR UPDATE", [auction.id])
""" Until this SELECT, other users could have modified the high  
bid, so do not trust the
in-memory copy. """
returned_rows = cursor.fetchall()
high_bid = returned_rows[0][0]
if new_bid > high_bid:
auction.high_bid = new_bid
auction.save()

If another user attempts to update the bid, it will block when doing  
the SELECT... FOR UPDATE until the first transaction closes, and will  
then continue.  Beware of deadlocks!  Keep the number of tables on  
which you acquire locks to a minimum, and acquire them in the same  
order in all places in your code.
--
-- Christophe Pettus
x...@thebuild.com


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How to handle this race condition?

[Continuation]

I'm working on an auction app.

In an Auction object I store the current_high_bid for that auction.

When a new_bid comes in, I:
1) retrieve the current_high_bid field of the Auction object
2) compare it with the new_bid
3) if the new bid is higher than current_high_bid, I update
current_high_bid to the value of the new_bid.

but there's a (slight) chance that between steps (1) and (3) a
different user could've submitted an even higher bid which then become
the current_high_bid. In that case step 3 should not proceed. What can
I do to make sure such a situation does not arise?

Thanks
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TemplateSyntaxError

[Zeynel]

Hello,

These are my tables:

BEGIN;
CREATE TABLE "wkw_school" (
"id" integer NOT NULL PRIMARY KEY,
"school" varchar(200) NOT NULL
)
;
CREATE TABLE "wkw_lawyer" (
"id" integer NOT NULL PRIMARY KEY,
"first" varchar(20) NOT NULL,
"initial" varchar(2) NOT NULL,
"last" varchar(20) NOT NULL,
"year_graduated" datetime NOT NULL,
"school_id" integer NOT NULL REFERENCES "wkw_school" ("id")
)
;
COMMIT;

(I changed "Education" to "School" because in the admin panel it
showed up as "Educations". I think "Schools" makes more sense.)


I created the admin and I registered School and Lawyer.

In the admin panel School link works fine but when I click on Lawyer
link I get a "TemplateSyntaxError at /admin/wkw/lawyer/
Caught an exception while rendering: no such column:
wkw_lawyer.school_id"

But according to the above tables, school_id has been created.

I tried to add in the shell,

p = Lawyer(school_id=1)

but

p.save()

throws an error.

Any ideas why Lawyer link in the admin panel does not work?

This is the offending line on the debug page:

78{% result_list cl %}

Thank you.
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MySQL and 'NoneType object is unsubscriptable' error

[Julien Phalip]

Hi,

I've tried to install MySQL for an existing project, and I'm getting a
strange error (see traceback below). Apparently "self.converter" is
None, but I can't see why.

I can access the database just fine using the 'mysql' command in the
terminal or using PhpMyAdmin.

Do you know how this could be fixed?

Thanks a lot for you help.

Julien


Traceback (most recent call last):
  File "/Users/julien/Documents/Development/eclipse/workspace/
myproject/trunk/site/manage.py", line 13, in 
execute_manager(settings)
  File "/Users/julien/Documents/Development/eclipse/workspace/django/
django/core/management/__init__.py", line 439, in execute_manager
utility.execute()
  File "/Users/julien/Documents/Development/eclipse/workspace/django/
django/core/management/__init__.py", line 380, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/julien/Documents/Development/eclipse/workspace/django/
django/core/management/base.py", line 195, in run_from_argv
self.execute(*args, **options.__dict__)
  File "/Users/julien/Documents/Development/eclipse/workspace/django/
django/core/management/base.py", line 222, in execute
output = self.handle(*args, **options)
  File "/Users/julien/Documents/Development/eclipse/workspace/django/
django/core/management/commands/runserver.py", line 84, in handle
inner_run()
  File "/Users/julien/Documents/Development/eclipse/workspace/django/
django/core/management/commands/runserver.py", line 48, in inner_run
self.validate(display_num_errors=True)
  File "/Users/julien/Documents/Development/eclipse/workspace/django/
django/core/management/base.py", line 249, in validate
num_errors = get_validation_errors(s, app)
  File "/Users/julien/Documents/Development/eclipse/workspace/django/
django/core/management/validation.py", line 67, in
get_validation_errors
connection.validation.validate_field(e, opts, f)
  File "/Users/julien/Documents/Development/eclipse/workspace/django/
django/db/backends/mysql/validation.py", line 15, in validate_field
db_version = connection.get_server_version()
  File "/Users/julien/Documents/Development/eclipse/workspace/django/
django/db/backends/mysql/base.py", line 297, in get_server_version
self.cursor()
  File "/Users/julien/Documents/Development/eclipse/workspace/django/
django/db/backends/__init__.py", line 81, in cursor
cursor = self._cursor()
  File "/Users/julien/Documents/Development/eclipse/workspace/django/
django/db/backends/mysql/base.py", line 281, in _cursor
self.connection = Database.connect(**kwargs)
  File "/opt/local/lib/python2.5/site-packages/MySQLdb/__init__.py",
line 81, in Connect
return Connection(*args, **kwargs)
  File "/opt/local/lib/python2.5/site-packages/MySQLdb/
connections.py", line 222, in __init__
self.converter[FIELD_TYPE.STRING].append((None, string_decoder))
TypeError: 'NoneType' object is unsubscriptable
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Re: Another Django vs. Rails comparison

[Paul Eastlund]

This is a helpful list of pros/cons. Thanks.

Your "development philosophy" point especially matches up well with my own
experience. A friend and I just wrote a website for a new small business (
http://www.final-draft-editing.com/) and chose Django -- after an initial
trial of Ruby on Rails --  more or less for the same reason you ended up
deciding on it: the Rails framework does many things by "magic" and you have
to learn certain conventions to make sure the magic works for you. In
django, the interface between application code and framework is much more
explicit. Reasonably capable python coders can jump in without as much of a
learning curve. (Also, Python is a much more pleasant language to work in
than Ruby, IMO.)

-Paul

On Mon, Nov 9, 2009 at 4:47 PM, Jason  wrote:

>
> This is my first post to this group, but I've benefited from reading
> other's posts and I'm looking forward to getting more involved. I just
> picked Django/Python as the framework for a new company I just
> started: FeedMagnet (http://feedmagnet.com).
>
> We want to get more involved in the community - we already have some
> CouchDB integration code that we're going to open source in the next
> couple weeks - and I thought a good way to get involved initially
> would be to share my experience choosing between Django and Rails.
>
> I read a lot of other posts on the topic (many of which are linked
> from my post) and talked with lots of other developers before making
> the decision. The single sentence summary of my post is that Django
> and Rails are both great frameworks and it is more important to get
> the right team in place and let them pick the one they like best.
>
> While I definitely favor Django, I think I am still new enough to the
> community that my opinions shouldn't be too biased. Hopefully this
> post helps other make the right decision for their team/project.
>
> Here's the link: http://beta.feedmagnet.com/blog/django-vs-rails/
>
> >
>


-- 
Paul Ragnar Eastlund

Me: (relating a joke) "...so I said, 'I'm working at Google. I'm the guy who
frantically does research when you type in a query.'"
Lorraine: "Oh." (long pause) "But is that really what you do?"
Sharon: "...And now, the joke is on you."

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Re: User class, change name of fields(like username with login name)

[Preston Holmes]

On Nov 9, 7:49 am, NMarcu  wrote:
> Hello all,
>
>    I have a list of all users. My head table is made with the fields
> from User class. So look like this:
>
> username           first name             last name
> superuser status
>
> I want to make this head table editable. How can I change the caption
> of the field, not the name of it. By ex: is_superuser field is build
> like this:
>
> is_superuser = models.BooleanField(_('superuser status'),
> default=False, help_text=_("Designates that this user has all
> permissions without explicitly assigning them."))
>
> In my table is list superuser status not is_superuser, this is good.
> How can I change: "superuser status" in something else from a view.

To make something this dynamic, you will need a model for your label,
with some way to key it to the column you want to use it for - I can't
think of a clean way to change the verbose name of the classes
dynamically as the objects are instantiated per request.  A simple, if
somewhat brittle way to do it, would be to use the __name__ of the
model in question and use that as a key to look up the label to use in
your form.

-Preston

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Re: Help about models

[Zeynel]

Hello Greg and Jirka,

Thanks for the help.

I was rereading the tutorial to understand the ForeignKey. It says
that ForeignKey "tells  Django each Choice is related to a single
Poll."

In my case, each lawyer is associated with 1 law school; and each law
school is associated with 1 or more lawyers. Considering this I
thought that ForeignKey should tell Django that "each lawyer is
related to a single School" so I put ForeignKey under Lawyer:

class Education(models.Model):
school = models.CharField(max_length=200)

class Lawyer(models.Model):
first = models.CharField(max_length=20)
initial = models.CharField(max_length=2)
last = models.CharField(max_length=20)
year_graduated = models.DateTimeField('Year graduated')
education = models.ForeignKey(Education)

Does this make sense? And, can you explain why this is needed in terms
of searching the database? What happens if I don't use a foreign key?

Thanks again.

On Nov 9, 7:36 am, Jirka Vejrazka  wrote:
> > I commented out the ForeignKey because it caused an error.
>
> Just a small coding note - it was causing an error because you did not
> specify the model name exactly (compare the character case)
>
>    Jirka
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Re: Templates,layout, css, ie and Pyjamas

[Ishwor Gurung]

Grant,
Hi

2009/11/10 grant neale :
>
> Hi Ishwor,
>
> I'm in France I'm afraid.
> Is there any solution out there for getting the basics up and running

- Download a copy of Django and give it a go.
- Extract it to a folder
- Run 'python setup.py install';
- Go to django directory
- python django-admin.py startproject 
- Go to 
- python manage.py startapp 
- Code away latest greatest app.. Your application logic in views.py,
your database models in models.py and your Django template in some
HTML file (say templates.html)
- Fix your settings.py,urls.py accordingly.
- python manage.py runserver
- Point your browser to http://127.0.0.1:8000/

All the instructions are already there in the docs if you get confused
or something...

When you get to a point where you can't do something, ask in the list.
Someone should be able to help you out real quick.

> and then going into the "beauty contest" later?
> Or are you just saying that it's hard, just eat your lunch?

It's too easy to call label it 'hard'. This mail took me 2 mins to
write. Imagine the possibility with what you can do with Django.
Last week, wonderful Peter of SyPy Fame gave a talk on GeoDjango. Twas
fun to say the least...

> If you ever come to France, I can send you some links on where to
> stay. :)

Sure nice thing. Thanks. I'll keep note of that :-)
-- 
Regards,
Ishwor Gurung

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Re: Django internationalization problem: Error: errors happened while running xgettext on __init__.py /bin/sh: xgettext: command not found

[rebus_]

2009/11/9 NMarcu :
>
> Hello all,
>
>   When I run django-admin.py makemessages -l ro I got this:
> Error: errors happened while running xgettext on __init__.py
> /bin/sh: xgettext: command not found
>
> You know why, I need to install somethng else?
> >
>

are you sure you have gettext installed on your computer?

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how to send an rfc822 email attachment

[Margie Roginski]

I am trying to write some add code to my app that accepts an email
from the user that contains attachments, adds those attachments to the
database and then sends an email containing those attachments.  I am
trying to get my code to work for the case were the attachment is an
outlook mail (ie, an rfc822 content-type). For other cases it is
working (ie, an msword doc or htm attachment), but there is something
trickier about sending out an rfc822 I think.

 I've got a small example of what I'm doing in my code I'm wondering
if anyone who understands email and FileFields could take a look.
Basically, I'm just trying to take the attached message, save it to a
django models.FileField, then send the contents of that FileField on
to recipients.

Here's my Attachment model:

class Attachment(models.Model):
file = models.FileField('File', upload_to=get_attachments_path)
filename = models.CharField('Filename', max_length=100)
mime_type = models.CharField('MIME Type', max_length=30)

Here's my code that is parsing the message and encountering the rfc822
sub part:

if message.get_content_type() == 'message/rfc822':
name = message.get_param("name")
content = message.as_string() # ??? this may be wrong?
mime_type = message.get_content_type()

a = Attachment(filename=name, mime_type=mime_type)
a.file.save(name, ContentFile(content))
msg = EmailMultiAlternatives(subject, body, from_email, to, cc)
msg.attach_file(a.file.path)
msg.send()

The problem I'm having is that when msg.send() gets called, I get an
error associated with my attachment:

  File "/tools/aticad/1.0/platform/any/lib/python2.6/email/
message.py", line 189, in get_payload
raise TypeError('Expected list, got %s' % type(self._payload))


I'm thinking that my argument to ContentFile() is wrong.  I'm giving
it message.as_string(), and I suspect that is wrong, but I can't
figure out what it should be.  Can anyone give me a hand?

Thank you for any pointers!

Margie



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Another Django vs. Rails comparison

[Jason]

This is my first post to this group, but I've benefited from reading
other's posts and I'm looking forward to getting more involved. I just
picked Django/Python as the framework for a new company I just
started: FeedMagnet (http://feedmagnet.com).

We want to get more involved in the community - we already have some
CouchDB integration code that we're going to open source in the next
couple weeks - and I thought a good way to get involved initially
would be to share my experience choosing between Django and Rails.

I read a lot of other posts on the topic (many of which are linked
from my post) and talked with lots of other developers before making
the decision. The single sentence summary of my post is that Django
and Rails are both great frameworks and it is more important to get
the right team in place and let them pick the one they like best.

While I definitely favor Django, I think I am still new enough to the
community that my opinions shouldn't be too biased. Hopefully this
post helps other make the right decision for their team/project.

Here's the link: http://beta.feedmagnet.com/blog/django-vs-rails/

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Re: Prevent brute-force password attacks?

[f4nt]

Yes, teaching users to not choose stupid username/password
combinations. That's the only correct/true fix. Are you worried about
the traffic that it consumes? If so, you continue to play in dicey
territory, since you're trying to deduce harmful bots from potentially
stupid users that just can't remember their account information. Yes,
it's easy to see in the aftermath with human eyes the difference,
seeing it as it happens with code, and being right 100% (which is the
only acceptable percentage in the case of usability) is difficult.

I don't personally know if anything exists to do what you want to do,
but it shouldn't be incredibly hard to write. You could log all the
IPs to the database, compare the frequency, and then what you do with
them from there is up to you. You could redirect the user elsewhere,
or serve them 404s to make them think the content's gone (could have
ill effects on SEO in rare cases). Then you could cron up a purge
scenario, after so many days, or if you definitely don't like the IP
you could write the IPs out to your firewall's blacklist (at least,
easy to do in shorewall). Ironically, doing all that will create
potentially more database calls and traffic than just weathering the
storm. Your call.

Btw, don't mean to be blunt/rude, as that's not my intention. Just
dealt with a lot of these scenarios as a sys admin in a former life,
and the answer is always to beat users over the head until they stop
choosing "god/god" as their username/password combination.

On Nov 9, 3:57 pm, Adam Seering  wrote:
> Hi,
>         Does there exist any code for Django to help defeat brute-force login
> attempts?  Something like blocking IP addresses from logging in if they
> try and fail too many times, etc.
>
> Adam
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Re: Prevent brute-force password attacks?

[Jorge Bastida]

Check http://code.google.com/p/django-axes/
Bye !

2009/11/9 Adam Seering 

>
> Hi,
>Does there exist any code for Django to help defeat brute-force
> login
> attempts?  Something like blocking IP addresses from logging in if they
> try and fail too many times, etc.
>
> Adam
>
>
> >
>


-- 
Benito Jorge Bastida
jo...@thecodefarm.com

thecodefarm SL
Av. Gasteiz 21, 1º Derecha
01008 Vitoria-Gasteiz
http://thecodefarm.com
Tel: (+34) 945 06 55 09

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Prevent brute-force password attacks?

[Adam Seering]

Hi,
Does there exist any code for Django to help defeat brute-force login 
attempts?  Something like blocking IP addresses from logging in if they 
try and fail too many times, etc.

Adam


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Re: DRY: max length not taken from Model.field when using ModelForm

[fest]

Tomasz, it was obvious for me too, however, I had defined a form,
which had some fields overridden, but some not- I was hoping that
options for fields that were not overridden were preserved, but due to
specific way admin interface handles forms, required class wasn't
added to my custom form fields. That's why I thought other field
options were not taken into account.


Reinis

On 7 nov., 21:27, Tomasz Zieliński 
wrote:
> On 7 Lis, 18:25, fest  wrote:
>
> > From my experience, max_length is not taken into account when you
> > override modelfieldin formfield.
>
> This is (and was, when I first time faced it) quite obvious for me .
> IfModelFormwas modifying overridden fields, the whole concept
> of overriding would be useless.
>
> On the other hand it would be nice if we could write something like:
>
> first_name = forms.CharField(max_length=copy_from_model)
>
> --
> Tomasz Zielińskihttp://pyconsultant.eu
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Django internationalization problem: Error: errors happened while running xgettext on __init__.py /bin/sh: xgettext: command not found

[NMarcu]

Hello all,

   When I run django-admin.py makemessages -l ro I got this:
Error: errors happened while running xgettext on __init__.py
/bin/sh: xgettext: command not found

You know why, I need to install somethng else?
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Re: how to create a faceted browser with Django

[Daniel Roseman]

On Nov 9, 4:24 am, SeanB  wrote:
> Many web sites offer faceted browsing such that a series of categories
> can be selected to narrow a large set of records down to a few (or
> one). Such interfaces often show how many records match the various
> category values, which sometimes helps direct the search. Likewise,
> since only valid combinations of categories values are shown and
> selectable, the problem problem of constraints with zero results are
> mitigated. You can see this in action on lots of shopping sites:
> Amazon's page on diamond wedding rings (http://www.amazon.com/gp/
> search/ref=sr_nr_n_2?rh=n%3A3367581%2Ck%3Adiamonds%2Cn%3A!3880591%2Cn
> %3A3887251=3880591=diamonds=UTF8=1257740168=388059 1)
> is a good example.
>
> I'm an intermediate-level Django user, and i'm trying to conceive how
> to architect a faceted browsing application in Django. I can see
> conceptually how a combination of constraints specified in the
> interface could translate into a series of filter statements on a
> model, and i can see how, with some constraints in place, the
> remaining values and the number of records matching them could be
> computed and presented.
>
> But I'm less sure how to provide a RESTful interface (since any of
> several constraints can be selected independently) in an efficient
> manner, or how to work out the template details. So i'm looking for
> some direction.
>
> Are there any Django sites out there already that use an approach like
> this? Or suggestions as to how to architect one?

We've achieved faceted search by using the haystack project, which
provides faceted search for Django out of the box in conjunction with
an external search engine, Solr. Works well for us.
--
DR.
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Re: how to create a faceted browser with Django

[SeanB]

as a follow-up: list_filter attributes in the admin interface provide
part of what i mean, but only part. Given a set of restrictions, the
admin interface:
* shows all possible choices, rather than the only remaining choices
that are possible
* doesn't show counts

Sean

On Nov 8, 8:24 pm, SeanB  wrote:
> Many web sites offer faceted browsing such that a series of categories
> can be selected to narrow a large set of records down to a few (or
> one). Such interfaces often show how many records match the various
> category values, which sometimes helps direct the search. Likewise,
> since only valid combinations of categories values are shown and
> selectable, the problem problem of constraints with zero results are
> mitigated. You can see this in action on lots of shopping sites:
> Amazon's page on diamond wedding rings (http://www.amazon.com/gp/
> search/ref=sr_nr_n_2?rh=n%3A3367581%2Ck%3Adiamonds%2Cn%3A!3880591%2Cn
> %3A3887251=3880591=diamonds=UTF8=1257740168=3880591)
> is a good example.
>
> I'm an intermediate-level Django user, and i'm trying to conceive how
> to architect a faceted browsing application in Django. I can see
> conceptually how a combination of constraints specified in the
> interface could translate into a series of filter statements on a
> model, and i can see how, with some constraints in place, the
> remaining values and the number of records matching them could be
> computed and presented.
>
> But I'm less sure how to provide a RESTful interface (since any of
> several constraints can be selected independently) in an efficient
> manner, or how to work out the template details. So i'm looking for
> some direction.
>
> Are there any Django sites out there already that use an approach like
> this? Or suggestions as to how to architect one?
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How can I change the verbose_name of a field and save this in model, or db, from a view?

[NMarcu]

Hello,

   I want to change the verbose_name to is_superuser, on User class.
The current one is superuser status, and I want to make this field
editable, and I need to change this verbose_name from view, how can I
do this?
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User class, change name of fields(like username with login name)

[NMarcu]

Hello all,

   I have a list of all users. My head table is made with the fields
from User class. So look like this:

username   first name last name
superuser status

I want to make this head table editable. How can I change the caption
of the field, not the name of it. By ex: is_superuser field is build
like this:

is_superuser = models.BooleanField(_('superuser status'),
default=False, help_text=_("Designates that this user has all
permissions without explicitly assigning them."))

In my table is list superuser status not is_superuser, this is good.
How can I change: "superuser status" in something else from a view.
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Re: Templates,layout, css, ie and Pyjamas

[grant neale]

Hi Ishwor,

I'm in France I'm afraid.
Is there any solution out there for getting the basics up and running  
and then going into the "beauty contest" later?
Or are you just saying that it's hard, just eat your lunch?

If you ever come to France, I can send you some links on where to  
stay. :)

Thanks'


On Nov 9, 2009, at 3:08 PM, Ishwor Gurung wrote:

>
> Hi,
>
> 2009/11/10 grant neale :
>>
>> Hi,
>>
>> I'm a hobbyist and do not have a lot of time on my hands to do front
>> end (templates, css) stuff.
> Hire a professional to do you it for you.
>
>> I was looking around and saw that pyjamas takes care of the layout of
>> the user interface.
>
> This is Django list FYI.
>
> [...]
>
>> Are there any other solutions out there that would let me develop the
>> layout quicker or easier?
> Templates are easy. If you know some HTML, it shouldn't take very long
> to figure out django templates.
>
>> Obviously I'm not too thrilled about making sure that all the  
>> browsers
>> look good.
> If you can abstract out browser specific functionality, should be good
> across all major browsers - Firefox, IE, Chrome
>
>> Can anyone help me?
> Google - Django templates. If you leave in Sydney, drop me an email
> off list. I can help you out for coupla beers ;-)
>
> -- 
> Regards,
> Ishwor Gurung
>
> >


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Re: Stuck with csrf_token in the tutorial

[wietse]

On Nov 9, 3:38 pm, Karen Tracey  wrote:
> On Mon, Nov 9, 2009 at 9:35 AM, wietse  wrote:
> > Running django 1.1.1
>
> > I'm going through the tutorial and have run into trouble implementing
> > a form, I get:
> >    TemplateSyntaxError at /polls/1/
> >    Invalid block tag: 'csrf_token'
>
> csrf_token didn't exist in 1.1.1 -- it's new in the development version.
> Please use the 1.1 docs:
>
> http://docs.djangoproject.com/en/1.1/intro/tutorial01/#intro-tutorial01
>
> (There is an open ticket to get these properly linked from the documentation
> page.)

Ok, thanks for the quick response!
Wietse
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Re: Databrowse: Loading a large number of records

[sstein...@gmail.com]

On Nov 9, 2009, at 7:49 AM, Ismail Dhorat wrote:
> I also see there has been a ticket logged for this issue about 2  
> years ago.
>
> http://code.djangoproject.com/ticket/4481
>
> Has this been implemented? If not would would a simple paginate tag in
> the template suffice?

Have you tried applying the patch in the ticket to see whether it  
solves your specific case?

S


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Re: Stuck with csrf_token in the tutorial

[Karen Tracey]

On Mon, Nov 9, 2009 at 9:35 AM, wietse  wrote:

>
> Hello,
>
> Running django 1.1.1
>
> I'm going through the tutorial and have run into trouble implementing
> a form, I get:
>TemplateSyntaxError at /polls/1/
>Invalid block tag: 'csrf_token'
>
>
csrf_token didn't exist in 1.1.1 -- it's new in the development version.
Please use the 1.1 docs:

http://docs.djangoproject.com/en/1.1/intro/tutorial01/#intro-tutorial01

(There is an open ticket to get these properly linked from the documentation
page.)

Karen

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Stuck with csrf_token in the tutorial

[wietse]

Hello,

Running django 1.1.1

I'm going through the tutorial and have run into trouble implementing
a form, I get:
TemplateSyntaxError at /polls/1/
Invalid block tag: 'csrf_token'

I've searched around but find it hard to grok what I need to do. In
settings.py I have:
MIDDLEWARE_CLASSES = (
'django.middleware.common.CommonMiddleware',
'django.contrib.csrf.middleware.CsrfMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
)

The form has a `{% csrf_token %}`, and the view is as per the
tutorial:
def detail(request, poll_id):
p = get_object_or_404(Poll, pk=poll_id)
return render_to_response('polls/detail.html',
{'poll': p},
context_instance=RequestContext(request))

Somewhere I read that if I get this kind of error it means I "have
failed to use the tag loader", but I don't know what that means.

Can somebody show me the way?

Wietse

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Re: django generic views w multiple models

[Ross]

Ok I think I've honed my problem down a bit further and more
concisely:

So I'm trying to create an Info object that is attached to a League
object, but I can't do this through the urlconf the way I have it now
because create_object() does not take an object id as an argument.
Somehow, I need to grab the League id number when a user clicks on a
league they want to enter their info for so that the user only signs
up for that one particular league. Is there a way to write a wrapper
to the generic create_object view to do this or do I need to scrap
generic views altogether in this instance and write my own view?

On Nov 8, 5:56 pm, Ross  wrote:
> 'm new to Django and programming in general. I'm trying to make a
> simple site that allows players of a sport sign up for leagues that
> have been created by the admin. In my models.py, I created two models:
> `from django.db import models from django.forms import ModelForm
>
> class League(models.Model): league_name = models.CharField
> (max_length=100) pub_date = models.DateTimeField('date published')
>
> class Info(models.Model): league = models.ManyToManyField(League) name
> = models.CharField(max_length=50) phone = models.IntegerField() email
> = models.EmailField() def unicode(self): return self.info
>
> class InfoForm (ModelForm): class Meta: model = Info exclude =
> ('league')`
>
> From what I've read, I can probably use the Create/Update/Delete
> generic views to display a form for the user to sign up for the
> league. So with my app, I want the user to come to a simple homepage
> that lists the leagues, be able to click on the league and enter their
> info to sign up. Here's what my urlconf looks like:`from
> django.conf.urls.defaults import * from mysite.player_info.models
> import League, Info, InfoForm
>
> info_dict = { 'queryset': League.objects.all(), }
>
> InfoForm = {'form_class' : InfoForm}
>
> urlpatterns = patterns('', (r'^$',
> 'django.views.generic.list_detail.object_list', info_dict), (r'^(?P\d
> +)/$', 'django.views.generic.list_detail.object_detail', info_dict),
> url(r'^(?P\d+)/results/$',
> 'django.views.generic.list_detail.object_detail', dict(info_dict,
> template_name='player_info/results.html'), 'league_results'), (r'^(?P\d
> +)/info/create/$', 'django.views.generic.create_update.create_object',
> InfoForm), )`
>
> Here's my problem: When I click on a league to sign up for on the
> homepage with my current setup, I get this error: TypeError at /league/
> 1/info/create create_object() got an unexpected keyword argument
> 'object_id'. What am I doing wrong?
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Re: Templates,layout, css, ie and Pyjamas

[Ishwor Gurung]

Hi,

2009/11/10 grant neale :
>
> Hi,
>
> I'm a hobbyist and do not have a lot of time on my hands to do front
> end (templates, css) stuff.
Hire a professional to do you it for you.

> I was looking around and saw that pyjamas takes care of the layout of
> the user interface.

This is Django list FYI.

[...]

> Are there any other solutions out there that would let me develop the
> layout quicker or easier?
Templates are easy. If you know some HTML, it shouldn't take very long
to figure out django templates.

> Obviously I'm not too thrilled about making sure that all the browsers
> look good.
If you can abstract out browser specific functionality, should be good
across all major browsers - Firefox, IE, Chrome

> Can anyone help me?
Google - Django templates. If you leave in Sydney, drop me an email
off list. I can help you out for coupla beers ;-)

-- 
Regards,
Ishwor Gurung

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Re: matplotlib usage problem

[Karen Tracey]

On Mon, Nov 9, 2009 at 8:36 AM, Oguz Yarimtepe  wrote:

>
> Hi,
>
> I was trying to use the matplotlib at my Django view. The version i was
> trying is 0.98. What i did is to import the library and then plot a graph.
> The problem is when i tried the "from pylab import *", i got "RuntimeError:
> could not create GdkCursor object". This is most probably because of the
> apache user is not able to access the X server. Indeed at my distro it
> doesn't have shell account.
>
> I don't want to define X access to apache user. So what do you suggest?
>
> Don't use the pylab API from Django code.  It assumes a GUI and also (if I
remember correctly) is not thread-safe.  You need to use the object-oriented
API, as shown here for example:

http://www.scipy.org/Cookbook/Matplotlib/Django

Karen

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Re: matplotlib usage problem

[Torsten Bronger]

Hallöchen!

Oguz Yarimtepe writes:

> I was trying to use the matplotlib at my Django view. The version
> i was trying is 0.98. What i did is to import the library and then
> plot a graph. The problem is when i tried the "from pylab import
> *", i got "RuntimeError: could not create GdkCursor object". This
> is most probably because of the apache user is not able to access
> the X server. Indeed at my distro it doesn't have shell account.
>
> I don't want to define X access to apache user. So what do you
> suggest?

Use the pure Agg backend instead of GtkAgg.

Tschö,
Torsten.

-- 
Torsten Bronger, aquisgrana, europa vetus
   Jabber ID: torsten.bron...@jabber.rwth-aachen.de
  or http://bronger-jmp.appspot.com


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matplotlib usage problem

[Oguz Yarimtepe]

Hi,

I was trying to use the matplotlib at my Django view. The version i was trying 
is 0.98. What i did is to import the library and then plot a graph. The problem 
is when i tried the "from pylab import *", i got "RuntimeError: could not 
create GdkCursor object". This is most probably because of the apache user is 
not able to access the X server. Indeed at my distro it doesn't have shell 
account.

I don't want to define X access to apache user. So what do you suggest?


-- 
Oguz Yarimtepe 

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Templates,layout, css, ie and Pyjamas

[grant neale]

Hi,

I'm a hobbyist and do not have a lot of time on my hands to do front  
end (templates, css) stuff.
I was looking around and saw that pyjamas takes care of the layout of  
the user interface.


Is this a reasonable solution to use instead of Django's templates?
Are there any other solutions out there that would let me develop the  
layout quicker or easier?

Obviously I'm not too thrilled about making sure that all the browsers  
look good.

Can anyone help me?

Grant

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[uploadify] passing user info to the signal handler

[Mike Thon]

The django-uploadify app allows bulk file uploads and for each
uploaded file, it fires a signal and passes the uploaded file data to
the receiver.  The author's example marks all the uploaded files with
a boolean (new_upload=True) and then returns a list of  files where
new_upload=True to the user.  If more than one user is uploading files
at the same time, they could get a list of files from other users.  I
would like to pass a user ID or some sort of session ID to the signal
receiver along with the file data so that it can be inserted into the
ORM along with the file data.  Does anyone know how I can do this?
Thanks
Mike
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Databrowse: Loading a large number of records

[Ismail Dhorat]

Hi Guys,

I am currently testing the contrib app databrowse in Django ver 1.1.1,
the current setup for testing purposes is:

OS: Mac OsX 10.6
DB: Sqlite3
Django: 1.1.1
Python: 2.5

Here is what i have done, i have a model and i am trying to see what
the capabilities and limits of this app (since i will most likely be
working with a huge number of records), i loaded +- 300,000 records
into the DB current SQLITE file size is 30mb

When trying to access /databrowse i get errors, and the page refuses
to load. It basically hangs, from the looks of it the page seems to be
displaying all the contents. Here is the traceback:

Traceback (most recent call last):
  File 
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/core/servers/basehttp.py",
line 280, in run
self.finish_response()
  File 
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/core/servers/basehttp.py",
line 320, in finish_response
self.write(data)
  File 
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/core/servers/basehttp.py",
line 399, in write
self.send_headers()
  File 
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/core/servers/basehttp.py",
line 463, in send_headers
self.send_preamble()
  File 
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/django/core/servers/basehttp.py",
line 381, in send_preamble
'Date: %s\r\n' % http_date()
  File 
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/socket.py",
line 261, in write
self.flush()
  File 
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/socket.py",
line 248, in flush
self._sock.sendall(buffer)
error: (32, 'Broken pipe')

I also see there has been a ticket logged for this issue about 2 years ago.

http://code.djangoproject.com/ticket/4481

Has this been implemented? If not would would a simple paginate tag in
the template suffice?

Regards,
Ismail

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Re: Display a view of a single record?

[Ludwik Trammer]

I have a really hard time understanding what do you need, and I
suspect I'm not the only one. You are talking about the admin
interface, right? It displays a list containing all records, and when
you click on a record you go to a page that shows all fields for this
record (and lets you change their values). Isn't that exactly what you
want?

If the problem is that you don't want the fields to be editable,
because you just want to display read-only lists of records: re-think
using admin interface. It is meant specifically for managing records
on your website. Just use
"django.views.generic.list_detail.object_list" (display list of
records) and "django.views.generic.list_detail.object_detail" (display
detailed view of a single record) generic views:

http://docs.djangoproject.com/en/dev/ref/generic-views/#django-views-generic-list-detail-object-list
http://docs.djangoproject.com/en/dev/ref/generic-views/#django-views-generic-list-detail-object-detail
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Re: Help about models

[Jirka Vejrazka]

> I commented out the ForeignKey because it caused an error.

Just a small coding note - it was causing an error because you did not
specify the model name exactly (compare the character case)

   Jirka

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Re: Template Syntax Error: url config module not found

[m3mitsuppe]

Ok, so I narrowed this down a bit: the problem was with
get_absolute_url. I still
do not understand why it would complain about the urls.py not being
found.

I'd still be happy about any hints, but in the meantime I changed my
template code
to a not-so-DRY but working version with explicit urls.

On 9 Nov., 08:46, m3mitsuppe  wrote:
> Hi all,
>
> I have a strange error on a website I developed (quite some time
> ago...).
>
> The main url works:http://www.christina-kratzenberg.de
>
> So do all the links at the bottom except for the "portfolio" one. It's
> of course the interesting part where a photo portfolio is shown.
>
> When I click on that link, Django issues a Template Syntax Error
> saying that the module "tina.urls" cannot be importet. That's kind of
> strange, because it must have been imported this exact module for
> rendering the home page and the other pages that do work.
>
> As this happens during template rendering, I'm a bit at a loss here.
> Can anyone provide me with ideas? I don't really understand where to
> look for a solution.
>
> I'm on Django 1.0.2 with mod_python. Upgrading Django to a newer
> version and/or migrating to mod_wsgi is possible, but I don't want to
> start changing everything without understanding what's happening here.
>
> Thanks!
> Eric
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memcached isspace(3) on server start with any cache refference

[timjdavey]

Hey I'm getting:

  mcm_validate_key_func():3443: memcache(4) protocol error: isspace(3)
returned true for character in key

error when I start a server (right after the "Validating models"
step). The weird and annoying part is - is that I've not yet
implemented cache anywhere yet. Only in settings - where its set:

  CACHE_BACKEND = 'memcached://127.0.0.1:11211/'

So http://code.djangoproject.com/ticket/7460 shouldn't apply (its not
yet used!).

In the python terminal the following works correctly:

  import cmemcache
   c = cmemcache.StringClient(['127.0.0.1:11211'])
   c.set('testkey', 'testval')
   c.get('testkey')
   >>> 'testval'

so memcache seems to be working. Is there anywhere in the models which
could be trying to write to the cache?

I've tried all the usuals (flushing, restarting etc...). This has me
stumped. Any ideas?

Thanks in advance,
- Tim
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Re: Collapsible fields

[Lars Stavholm]

Daniel Roseman wrote:
> On Nov 9, 8:47 am, Lars Stavholm  wrote:
>> Hi All,
>>
>> I'm looking to implement collapsible fields in a django powered
>> page, so far with no luck.
>>
>> Any hints on the best way of doing it?
>>
>> In the mean time, I checked out how it's done in the admin interface,
>> and came up with a simple test page as follows:
>>
>> 
>>   
>> >   href="http://localhost:8000/media/css/forms.css; />
>> > src="http://localhost:8000/media/js/core.js";>
>> 
>> >  src="http://localhost:8000/media/js/admin/CollapsedFieldsets.js";>
>> 
>>   
>>   
>> 
>>   Job Details
>>   
>> 
>>   Jdate:
>>   >  class="vTextField" maxlength="30"
>>  type="text" id="id_jdate" />
>> 
>>   
>> 
>>   
>> 
>>
>> But for some reason, it does not work. The collapsed
>> field shows up (I guess) by ways of the Job Details
>> showing up, but nothing else.
>>
>> Any hints?
>>
>> I admit, I'm a newbie at these things, but still.
>>
>> Any advice appreciated.
>>
>> R
>> /Lars
> 
> None of the admin scripts will work without the 'jsi18n' script, which
> is actually accessed via an admin view. Include this line before the
> other scripts:
> http://localhost:8000/admin/
> jsi18n/">
> and it should work.
> 
> Firebug is great for debugging this sort of thing - it would have told
> you 'gettext is not defined' which would have helped track down the
> problem.

Great advice, thank you.Just started using firebug and of course
encountered the gettext error. I put the script link in there as
you suggested, and it's all working very nicely now.

Many thanks
/Lars


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Re: Collapsible fields

[Daniel Roseman]

On Nov 9, 8:47 am, Lars Stavholm  wrote:
> Hi All,
>
> I'm looking to implement collapsible fields in a django powered
> page, so far with no luck.
>
> Any hints on the best way of doing it?
>
> In the mean time, I checked out how it's done in the admin interface,
> and came up with a simple test page as follows:
>
> 
>   
>                href="http://localhost:8000/media/css/forms.css; />
>                  src="http://localhost:8000/media/js/core.js";>
>     
>           src="http://localhost:8000/media/js/admin/CollapsedFieldsets.js";>
>     
>   
>   
>     
>       Job Details
>       
>         
>           Jdate:
>                             class="vTextField" maxlength="30"
>                  type="text" id="id_jdate" />
>         
>       
>     
>   
> 
>
> But for some reason, it does not work. The collapsed
> field shows up (I guess) by ways of the Job Details
> showing up, but nothing else.
>
> Any hints?
>
> I admit, I'm a newbie at these things, but still.
>
> Any advice appreciated.
>
> R
> /Lars

None of the admin scripts will work without the 'jsi18n' script, which
is actually accessed via an admin view. Include this line before the
other scripts:
http://localhost:8000/admin/
jsi18n/">
and it should work.

Firebug is great for debugging this sort of thing - it would have told
you 'gettext is not defined' which would have helped track down the
problem.
--
DR.
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Re: Helsinki area djangonauts: Let's meet up

[akaihola]

Count me in. Also sent the message to three djangonauts I know who are
not on djangopeople.
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Re: Django web flow

[bruno desthuilliers]

On 8 nov, 17:49, Lana  wrote:
> Hi!
>
> Does Django have some sort of web flow similar to the Spring web flow
> in Java?

Err... Do we have to read Spring's doc to find out what this means ?


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Running doctests of app custom filters

[Nicolas Perriault]

Hi, first timer message here :)

I'm discovering both Django and Python and loving them so far. I'm
pretty excited by the abilities offered by doctests. I've written some
custom template filters and would like their doctests to be executed
when I run ./manage.py test myapp. I didn't find a way reading the
documentation... Any hint?

Thanks.

-- 
Nicolas Perriault
http://prendreuncafe.com - http://symfonians.net
Mobile: +33 660 92 08 67

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Collapsible fields

[Lars Stavholm]

Hi All,

I'm looking to implement collapsible fields in a django powered
page, so far with no luck.

Any hints on the best way of doing it?

In the mean time, I checked out how it's done in the admin interface,
and came up with a simple test page as follows:


  
http://localhost:8000/media/css/forms.css; />
http://localhost:8000/media/js/core.js";>

http://localhost:8000/media/js/admin/CollapsedFieldsets.js";>

  
  

  Job Details
  

  Jdate:
  

  

  


But for some reason, it does not work. The collapsed
field shows up (I guess) by ways of the Job Details
showing up, but nothing else.

Any hints?

I admit, I'm a newbie at these things, but still.

Any advice appreciated.

R
/Lars


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