Re: New python, django user... having issues

[Vang]

Hey, thank you guys so much for your help. I was able to get
everything installed. Appreciate it lots.

On Apr 16, 2:40 pm, Łukasz Rekucki  wrote:
> On 16 April 2011 16:36, Walt  wrote:
>
> > Windows 64 does make things interesting, but just to summarize
> > what I do to install on Windows:
>
> > Install mod_python for python 2.5:
>
> Do yourself a favour and switch to something else then mod_python.
> It's a dead project (that's why it probably won't work with newer
> Python). Use mod_wsgi, uwsgi or gunicorn (or any other WSGI server).
>
> > The reason for using 2.5 is that mod_python or windows and
> > the MySQL Python connector only support that version, at
> > least as far as I have been able to find.
>
> The PyPI page says otherwise[1]. You probably mean that there is no
> binary packages for newer Python versions. If you trust random blogs,
> here are some packages [2][3].
>
> [1]:http://pypi.python.org/pypi/MySQL-python/1.2.3
> [2]:http://www.codegood.com/archives/4
> [3]:http://www.codegood.com/archives/129
>
> --
> Łukasz Rekucki

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Re: Using composition in Django

[Ian Clelland]

On Sat, Apr 16, 2011 at 1:35 PM, Guevara  wrote:

> Hello!
> I have two class, Person and employee, i need make a composition for
> this (Prefer composition over inheritance):
>
> class Person(models.Model):
>name = models.CharField(max_length=50)
>date_inclusion = models.DateField()
># others fields
>
> class Employee(models.Model):
>person = models.OneToOneField(Person, primary_key=True)
>address = models.OneToOneField(Address, primary_key=True)
>
>
> The SQL generate is:
>
>
> BEGIN;
> CREATE TABLE "person_person" (
>"id" serial NOT NULL PRIMARY KEY,
>"name" varchar(50) NOT NULL,
>"date_inclusion" date NOT NULL,
> )
> ;
> CREATE TABLE "employee_employee" (
>"person_id" integer NOT NULL PRIMARY KEY,
>"address_id" integer NOT NULL PRIMARY KEY,
> )
> ;
>
>
> This is correct? Should generate the id of the employee?
>

I don't think it's correct -- a database table shouldn't have two distinct
primary keys. It's the "primary_key=True" part of your Employee model fields
that is doing this, and is also stopping an "id" field from being
automatically generated.

If you write Employee like this:

class Employee(models.Model):
   person = models.OneToOneField(Person)
   address = models.OneToOneField(Address)

Then it will generate SQL like this:

CREATE TABLE "employee_employee" (
   "id" serial NOT NULL PRIMARY KEY,
   "person_id" integer NOT NULL,
   "address_id" integer NOT NULL
)
;

which is probably closer to what you're expecting.

-- 
Regards,
Ian Clelland


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Re: 'Context' object has no attribute 'render_context'

[jhen095]

Thanks Walt.

I'm not sure why the code is misbehaving either but render_to_response
works so I'll roll with that.

Cheers

On Apr 16, 10:22 am, Walt  wrote:
> I'm not sure I know why your code is misbehaving, but any
> particular reason you aren't using render_to_response instead
> of template/context rendering?
>
> http://docs.djangoproject.com/en/dev/topics/http/shortcuts/#render-to...
>
> It's much simpler!
>
> Walt
>
> -~

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Re: Using composition in Django

[Yuka Poppe]

Hi Guevara,

Proxy models only inherit python logic, they are what you expect when
you subclass a superclass; I dont think thats what you want in this
case.

I think you actually do want multi-table inheritence, im not too well
educated in "design patterns" but i think thats what you mean by
composition. However, allthough Python itselfs supports
multiple-inheretence, im not sure if that works with more then two
Django models.

Subclassing a Django model implies a OneToOne relationship which is
automaticly generated. An instance of employee should then contain
fields from both Person and Adress on the python layer, and contain
only the foreign keys on the database layer. Again i'm not sure if
this works with 3 models involved (Address, Person and Employee). Take
a look at 
http://docs.djangoproject.com/en/1.3/topics/db/models/#multi-table-inheritance

This is what i mean:

class Person(models.Model):
 first_name ...
 last_name ...

class Adress(models.Model):
 street ...
 city ...

class Employee(Person, Adress):
pass

Regards, Yuka

On Sat, Apr 16, 2011 at 10:35 PM, Guevara  wrote:
> Hello!
> I have two class, Person and employee, i need make a composition for
> this (Prefer composition over inheritance):
>
> class Person(models.Model):
>    name = models.CharField(max_length=50)
>    date_inclusion = models.DateField()
>    # others fields
>
> class Employee(models.Model):
>    person = models.OneToOneField(Person, primary_key=True)
>    address = models.OneToOneField(Address, primary_key=True)
>
>
> The SQL generate is:
>
>
> BEGIN;
> CREATE TABLE "person_person" (
>    "id" serial NOT NULL PRIMARY KEY,
>    "name" varchar(50) NOT NULL,
>    "date_inclusion" date NOT NULL,
> )
> ;
> CREATE TABLE "employee_employee" (
>    "person_id" integer NOT NULL PRIMARY KEY,
>    "address_id" integer NOT NULL PRIMARY KEY,
> )
> ;
>
>
> This is correct? Should generate the id of the employee?
> Proxy models could be used for this case?
>
> Thanks!
>
> --
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>
>

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Re: Put an "inline" at the top of admin form instead of bottom?

[Yuka Poppe]

Hi Jeff,

I dont knw the details of the top of my head, but you could place
inherit a changeform template dedicated for your specific app/model,
and simply edit it to have the inline formsets on the top, or use a
conditional template tag to display only one of your inline models at
the top. I think its all documented in the admin section of the
manual.

Yuka

On Sat, Apr 16, 2011 at 5:30 AM, Jeff Blaine  wrote:
> I'm using the admin functionality for most of my needs (a nice CRUD DB
> frontend, not a user-facing website).  Is there a best way to get one of my
> inline models presented at the top of the form instead of the bottom?  I
> would greatly prefer not to have to specify all of the fields (via
> ModelAdmin.fields), as we really like the automatic introspection
> functionality.
>
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Re: New python, django user... having issues

[Łukasz Rekucki]

On 16 April 2011 16:36, Walt  wrote:
> Windows 64 does make things interesting, but just to summarize
> what I do to install on Windows:
>
> Install mod_python for python 2.5:

Do yourself a favour and switch to something else then mod_python.
It's a dead project (that's why it probably won't work with newer
Python). Use mod_wsgi, uwsgi or gunicorn (or any other WSGI server).

> The reason for using 2.5 is that mod_python or windows and
> the MySQL Python connector only support that version, at
> least as far as I have been able to find.

The PyPI page says otherwise[1]. You probably mean that there is no
binary packages for newer Python versions. If you trust random blogs,
here are some packages [2][3].

[1]: http://pypi.python.org/pypi/MySQL-python/1.2.3
[2]: http://www.codegood.com/archives/4
[3]: http://www.codegood.com/archives/129

-- 
Łukasz Rekucki

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Re: New python, django user... having issues

[Walt]

I think you're hijacking this thread, yes?

Can you submit all the code for the models, please?

Perhaps start a new thread...

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django models, nested classes, and some weird behavior

[Ellery Newcomer]

Hello.

In an app I'm working on I have a package which contains an arbitrary
number of modules, each of which is expected to contain several django
models. In each module, the models have the same name, but they are
nested in an outer class, which I assume shouldn't cause problems.
However, it does. In my whittled down example, model PluginLite.Job is
somehow assigned PluginPlus.Job. Problem seems to go away when Jobs
don't extend models.Model

#capabilities/__init__.py:
__all__ = ['PluginPlus','PluginLite']

from django.conf import settings
if not settings.configured:
settings.configure(
DATABASE_ENGINE = 'sqlite3',
DATABASE_NAME = 'db.sqlite',
DATABASE_USER = '',
DATABASE_PASSWORD = '',
DATABASE_HOST = '',
DATABASE_PORT = '',
TIME_ZONE = '',
)
import capabilities
from capabilities import *
print
'PluginLite.PluginLite.Job:',capabilities.PluginLite.PluginLite.Job
# import capabilities and this prints out 


#capabilities/PluginLite.py
from django.db import models

class PluginLite:
class Job(models.Model):
class Meta:
db_table = 'PluginLite_Job'

class WorkUnit(models.Model):
class Meta:
db_table = 'PluginLite_WorkUnit'



#capabilities/PluginPlus.py
from django.db import models

class PluginPlus:
class Job(models.Model):
class Meta:
db_table = 'PluginPlus_Job'

class WorkUnit(models.Model):
class Meta:
db_table = 'PluginPlus_WorkUnit'

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Re: Test fails to run

[gladys]

Hi,

In which part of the test are you truncating the db?
It could also be that test_ db is still in your database
after a previous run of test, and it refuses to flush.
Try manually deleting it and running syncdb again.


--
Gladys
http://blog.bixly.com


On Apr 17, 1:20 am, Aleksandr Vladimirskiy 
wrote:
> Hello,
>
> I'm running a test but it fails after syncdb part with the following
> message:
>
> Error: Database test_ couldn't be flushed. Possible
> reasons:
>   * The database isn't running or isn't configured correctly.
>   * At least one of the expected database tables doesn't exist.
>   * The SQL was invalid.
> Hint: Look at the output of 'django-admin.py sqlflush'. That's the SQL
> this command wasn't able to run.
> The full error: cannot truncate a table referenced in a foreign key
> constraint
> DETAIL:  Table "" references "".
> HINT:  Truncate table "" at the same time, or use
> TRUNCATE ... CASCADE.
>
> The foreign key is between models in 2 different apps.
>
> Thanks,
>
> Alex

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Using composition in Django

[Guevara]

Hello!
I have two class, Person and employee, i need make a composition for
this (Prefer composition over inheritance):

class Person(models.Model):
name = models.CharField(max_length=50)
date_inclusion = models.DateField()
# others fields

class Employee(models.Model):
person = models.OneToOneField(Person, primary_key=True)
address = models.OneToOneField(Address, primary_key=True)


The SQL generate is:


BEGIN;
CREATE TABLE "person_person" (
"id" serial NOT NULL PRIMARY KEY,
"name" varchar(50) NOT NULL,
"date_inclusion" date NOT NULL,
)
;
CREATE TABLE "employee_employee" (
"person_id" integer NOT NULL PRIMARY KEY,
"address_id" integer NOT NULL PRIMARY KEY,
)
;


This is correct? Should generate the id of the employee?
Proxy models could be used for this case?

Thanks!

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Re: Using request.GET and having issues

[Karen Tracey]

2011/4/16 Karen McNeil 

> Yep, the encoding was the problem.  I just added a line
>searchterm = searchterm.encode('utf-8')
>

Does the nltk code not support unicode? A better solution would be to never
do explicit encoding yourself, but rather just pass unicode from the DB and
unicode from request.GET into nltk, unless that doesn't work for some
reason.

Karen
-- 
http://tracey.org/kmt/

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Test fails to run

[Aleksandr Vladimirskiy]

Hello,

I'm running a test but it fails after syncdb part with the following
message:

Error: Database test_ couldn't be flushed. Possible
reasons:
  * The database isn't running or isn't configured correctly.
  * At least one of the expected database tables doesn't exist.
  * The SQL was invalid.
Hint: Look at the output of 'django-admin.py sqlflush'. That's the SQL
this command wasn't able to run.
The full error: cannot truncate a table referenced in a foreign key
constraint
DETAIL:  Table "" references "".
HINT:  Truncate table "" at the same time, or use
TRUNCATE ... CASCADE.

The foreign key is between models in 2 different apps.

Thanks,

Alex

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Re: Python quit unexpectedly

[Yuka Poppe]

On Sat, Apr 16, 2011 at 6:17 PM, Hudar  wrote:
> Withouth grappeli, I can go to django admin page. But
> after install grappelli, and try to access  http://127.0.0.1/admin/
> error appear 'Python quite unexpectedly'.

Hello Hudar,

It means python crashed, in general this occurs when theres a problem
with one of the shared library dependencies. Maybe you can post some
information about the os you are running this on, what python packages
are installed or availeable on your sys.path and maybe your Django
settings.py

Also, which grappelli branch are you using? I recall there being
atleast 4, all with different dependencies. What happens when you open
a shell and do a "from grappelli import *"?

Is there any other information being reported besides that error, what
does the console report before it crashes?

Yuka

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Re: Using request.GET and having issues

[Karen McNeil]

Yep, the encoding was the problem.  I just added a line
searchterm = searchterm.encode('utf-8')

and now it works!

Thank you!



On Apr 16, 9:19 am, Karen Tracey  wrote:
> 2011/4/16 Karen McNeil 
>
>
>
> > I have the following view set up:
>
> > def concord(request):
> >    searchterm = request.GET['q']
> >    ... more stuff ...
> >    return render_to_response('concord.html', locals())
>
> > With URL "http://mysite.com/concord/?q=برشه;, and template code
> >     Your search for {{ searchterm }} returned {{ results }}
> > results in {{ texts.count }} texts.
> > I get this result on the page:
> >    Your search for برشه returned 0 results in 8 texts.
>
> > The search term (برشه) is being passed successfully, but there should
> > be 13 results, not zero.  When I hard-code "searchterm = 'برشه' " into
> > the concord view, instead of "searchterm = request.GET['q']", the page
> > displays perfectly.
>
> With this line of code:
>
> "searchterm = 'برشه' "
>
> searchterm will be a bytestring, utf-8 encoded if that is the encoding of
> your file.
>
> With this:
>
> searchterm = request.GET['q']"
>
> it will be unicode. Django returns unicode from the DB and request
> dictionaries.
>
> I notice you are explicitly encoding to utf-8 the texts you are searching
> before passing them into the nltk code. However you never do this for the
> searchterm, and I'd guess that is why the difference in results when you
> hard code it vs. pulling it from request.GET.
>
> Can't you pass unicode to the nltk code? If you can, I'd get rid of the
> explicit encoding to utf-8 of the DB content you are searching. If you
> really must pass it bytestrings instead of of unicode, then explicitly
> encoding the search term to to utf-8 as well will probably fix the problem.
>
> Karen
> --http://tracey.org/kmt/

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limit_choices_to (or some other way) to filter ForeignKey choices based on current model field

[Aljoša Mohorović]

if i have something like this:
===
class MyModel(models.Model):
name  = models.CharField(max_length=255)

class OtherModel(models.Model):
name  = models.CharField(max_length=255)
mymodel = models.ForeignKey(MyModel)

class MyModelItem(models.Model):
mymodel = models.ForeignKey(MyModel)
other = models.ForeignKey(OtherModel, null=True, blank=True)
===

how can i use limit_choices_to (or some other way) to filter
ForeignKey choices based on current model field?
basically, how can i do:
other = models.ForeignKey(OtherModel, null=True, blank=True,
limit_choices_to={'mymodel': 'self.mymodel'})

any options works for me (overwriting admin.TabularInline or form for
TabularInline).
thanks for any info.

Aljosa

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Re: New python, django user... having issues

[leo]

I have two models, model A and model B ,

model A like this

CUSTOMER_NAME = (
(IBM, 'IBM'),
(GSMC, 'GSMD'),
(CSMC, 'CSMC'),
(HJTC, 'HJTC'),

customer_name = models.IntegerField(choices = CUSTOMER_NAME, default = IBM,)
activity_type = models.IntegerField(choices = ACTIVITY_TYPE, )

I want the constant CUSTOMER_NAME  query from model B, how can I do that,
when I make a query in model A main body, like this

entity_id = ToolDetail.objects.all()

it tell me entity_id is not definedhow can I make this 
query...someone help me.



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Aw: How to unit test if user has access to page

[Martin Brochhaus]

Also beware! Only do a client.post if you really want to test that a user 
submits a form. Usually when a not-logged-in-user wants to go to a secured 
page immediately he will try a get request and just enter the URL. Sometimes 
your view behaves differently on get and on post (most of the times) so you 
probably should test both scenarios.

Best regards,
Martin

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Re: Using request.GET and having issues

[Karen McNeil]

No, that's not the issue. In addition to displaying the count, the
page also shows the resulting sentences, and the count here is correct
because no results were returned.

I think Karen, below, might be right that it has something to do with
the encoding of the search string... I'll try working that angle and
see if I get anywhere with it.

Thank you all for your help...


On Apr 16, 5:41 am, Shawn Milochik  wrote:
> This doesn't appear to be a Django question. Your 'results' variable
> is being populated by checking the length of an
> nltk.text.ConcordanceIndex() instance. I'm not familiar with the nltk
> module, but I'm assuming you are at least a little, since you're using
> it. It appears that its length isn't useful in determining the count
> you want.
>
> Shawn

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Python quit unexpectedly

[Hudar]

Hi,
Anyone got this problem?

I try to run grappelli on django 1.3. and run this command :

#python manage.py runserver

Server running. Withouth grappeli, I can go to django admin page. But
after install grappelli, and try to access  http://127.0.0.1/admin/
error appear 'Python quite unexpectedly'.

I try both on python 2.5 and python 2.6, got the same error.

For additional info, below is my url.py
=== url.py =
from django.conf.urls.defaults import patterns, include, url

from django.contrib import admin
admin.autodiscover()

urlpatterns = patterns('',

(r'^admin/', include(admin.site.urls)),
 (r'^grappelli/', include('grappelli.urls')),
)
===

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Re: New python, django user... having issues

[Walt]

Windows 64 does make things interesting, but just to summarize
what I do to install on Windows:

Install python2.5: http://www.python.org/download/releases/2.5.4/
Install latest apache: http://httpd.apache.org/download.cgi#apache22
Install mod_python for python 2.5:
http://archive.apache.org/dist/httpd/modpython/win/3.3.1/mod_python-3.3.1.win32-py2.5-Apache2.2.exe
Install your database of choice (postgresql 9.0.1/ mysql):
http://www.enterprisedb.com/products-services-training/pgdownload#windows
http://www.mysql.com/downloads/mysql/
Install the appropriate python connector:
http://www.stickpeople.com/projects/python/win-psycopg/psycopg2-2.4.win32-py2.5-pg9.0.3-release.exe
http://sourceforge.net/projects/mysql-python/files/mysql-python/1.2.2/MySQL-python-1.2.2.win32-py2.5.exe/download

I also usually install svn: http://www.sliksvn.com/en/download
svn co http://code.djangoproject.com/svn/django/trunk/

Add python's bin to your path, add django-admin.py to your path
and you should be good to go.

The reason for using 2.5 is that mod_python or windows and
the MySQL Python connector only support that version, at
least as far as I have been able to find.

Good luck,
Walt


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Re: 'Context' object has no attribute 'render_context'

[Walt]

I'm not sure I know why your code is misbehaving, but any
particular reason you aren't using render_to_response instead
of template/context rendering?

http://docs.djangoproject.com/en/dev/topics/http/shortcuts/#render-to-response

It's much simpler!

Walt

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Re: Using request.GET and having issues

[Walt]

> searchterm = request.GET['q']

Shouldn't this be: request.GET.get('q','')


Walt

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Re: Unexplainable delay when binding request.POST to form

[Karen Tracey]

On Sat, Apr 16, 2011 at 7:10 AM, Toni Milovan  wrote:

> I'm getting 20-30 seconds delay when trying to bind request.POST data
> to form.
>
> -
>CompanyFormset = modelformset_factory(Company,
> form=EditCompanyForm, extra=0)
>
>if request.method == 'POST':
>formset = CompanyFormset(request.POST, request.FILES)
>if formset.is_valid():
>formset.save()
>
> ---
>
> It just happens on one server, and on this line: "formset =
> CompanyFormset(request.POST, request.FILES)". I have tried without
> request.FILES and without multipart data and always getting the same
> delay. I have also tried runing development server and mod_wsgi and
> results are the same.
>
> Delay only happens when binding request data, if I just try to save
> formset everything is fast as it should be. Also, on my development
> laptop there is no delay whatsoever. On the same server I have other
> sites and everything works well so I just have no idea where else I
> could look for solution.
>
> Does anyone have any idea what can cause such behavior?
>

No clue. How have you determined that that line of code is taking 20 seconds
to run?

Since you say you can recreate with the dev server on this machine, I would
probably tackle this with pdb by putting a breakpoint before that code,
stepping into the execution of CompanyFormset(request.POST, request.FILES),
and then stepping through the code to narrow down where the big delay is.

Karen
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Re: Using request.GET and having issues

[Karen Tracey]

2011/4/16 Karen McNeil 

> I have the following view set up:
>
> def concord(request):
>searchterm = request.GET['q']
>... more stuff ...
>return render_to_response('concord.html', locals())
>
> With URL "http://mysite.com/concord/?q=برشه;, and template code
> Your search for {{ searchterm }} returned {{ results }}
> results in {{ texts.count }} texts.
> I get this result on the page:
>Your search for برشه returned 0 results in 8 texts.
>
> The search term (برشه) is being passed successfully, but there should
> be 13 results, not zero.  When I hard-code "searchterm = 'برشه' " into
> the concord view, instead of "searchterm = request.GET['q']", the page
> displays perfectly.
>

With this line of code:

"searchterm = 'برشه' "

searchterm will be a bytestring, utf-8 encoded if that is the encoding of
your file.

With this:

searchterm = request.GET['q']"

it will be unicode. Django returns unicode from the DB and request
dictionaries.

I notice you are explicitly encoding to utf-8 the texts you are searching
before passing them into the nltk code. However you never do this for the
searchterm, and I'd guess that is why the difference in results when you
hard code it vs. pulling it from request.GET.

Can't you pass unicode to the nltk code? If you can, I'd get rid of the
explicit encoding to utf-8 of the DB content you are searching. If you
really must pass it bytestrings instead of of unicode, then explicitly
encoding the search term to to utf-8 as well will probably fix the problem.

Karen
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Unexplainable delay when binding request.POST to form

[Toni Milovan]

Hi,

I'm getting 20-30 seconds delay when trying to bind request.POST data
to form.

-
CompanyFormset = modelformset_factory(Company,
form=EditCompanyForm, extra=0)

if request.method == 'POST':
formset = CompanyFormset(request.POST, request.FILES)
if formset.is_valid():
formset.save()

---

It just happens on one server, and on this line: "formset =
CompanyFormset(request.POST, request.FILES)". I have tried without
request.FILES and without multipart data and always getting the same
delay. I have also tried runing development server and mod_wsgi and
results are the same.

Delay only happens when binding request data, if I just try to save
formset everything is fast as it should be. Also, on my development
laptop there is no delay whatsoever. On the same server I have other
sites and everything works well so I just have no idea where else I
could look for solution.

Does anyone have any idea what can cause such behavior?

Thanks.

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Re: Using request.GET and having issues

[Shawn Milochik]

This doesn't appear to be a Django question. Your 'results' variable
is being populated by checking the length of an
nltk.text.ConcordanceIndex() instance. I'm not familiar with the nltk
module, but I'm assuming you are at least a little, since you're using
it. It appears that its length isn't useful in determining the count
you want.

Shawn

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