Is it worth refactoring a version 2 of django app to use reusable app

[Amit Sethi]

Hi all, My question is very simple , Is it worth refactoring an
existing and running app  for its version 2 , such that it uses
reusable apps. Also is there a nice blog post on the benefits of
reusable apps

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How does the multiple database concept work after django 1.2

[Amit Sethi]

Hi all , My app has started breaking after moving to django 1.3 . I
don't really understand why?

I am working  using site framework and given model definition through
app_label. The only majot change as I can see is that I use UUID
Fields rather than AutoField. Now somehow i see that my app is trying
to make a connection to some other db essentially.

ConnectionDoesNotExist: The connection myapp doesn't exist

myapp here is one of applications in my site famework and the model
definations are given as


myapp/
 __init__.py
 Circle.py
 Sqaure.py

where Circle and Square are the different models ... Can someone tell
me how this came out ...

I checked again by moving the back to 1.1 and it works like a charm
... Interesting while I have given defination of one more database in
my settings ... I am not actually using it anywhere as yet...


Thanks
Amit




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Taking a sample mysql dump

[Amit Sethi]

Is there a way one could take the dump of just a few sample fields using
mysqldump or some other similar tool. ?? Such that you can use it similar
to fixture data

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Integrating facebook canvas with django

[Amit Sethi]

Hi all , I have to integrate a few django apps with facebook without
having to do a major code change on the django apps side.

One of the things that I need is to do is to replace django's user
backend such that it uses the facebook authentication mechanism .But
at same time be able to use other third party django plugins . What
would be an effective way to do that such that third party django apps
can be integrated without changing any code.





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Facebook csrf middleware problem

[Amit Sethi]

Hi all , I am writing that shall be a facebook canvas app as well as a
standard app at the same time. Now for the time being I am just
working with removing csrf from my middleware classes but does anyone
know about a project that handles this more effectively such that i
can use csrf middleware for my standard app and exempts it when
request comes from facebook

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circular dependency in models.py

[Amit Sethi]

I think the solution to this might actually be very simple . I have an
app stories that looks something like this at the moment . It is in
the same file ideally i would like if both of them were related by
foreignkey but that is not possible because they are in same file and
there are declaration issues(NameError).

class Story(models.Model):
"""Story model."""

author = models.ForeignKey(User, blank=True, null=True)
title = models.TextField(_('title'), )


class Vote(models.Model):
"""
A vote on an story by a User.
"""
user = models.ForeignKey(User)
story = models.ForeignKey(Story)
votes = models.SmallIntegerField(default=0)

if i make a foreignkey in story , I have to write a very complicated
query to ensure no user can vote twice.  In case I keep it in vote its
incredibly complicated to write a query to get the score for a story
and order stories by vote what should i do .


Thanks
Amit

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Workflow for a django based facebook canvas app

[Amit Sethi]

Well a very common workflow for writing views in django is to do
something like this

if request.method == 'POST':
   do some form related stuff
else :
  do some other stuff


But for a facebook canvas app all requests are POST , how can I change
my workflow such that my app works for both facebook canvas and as a
normal app with out any major change to my code.


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Delegating a async job from a django view

[Amit Sethi]

What is the best solution for delegating a long time taking job from a
django view. Basically i wish to query a few web api , analyze and
then create a report . The report is not to be created in a sync
manner and can be sent at a later time . But it will have a web
interface to decide a few factors . I somehow think that twisted can
be used for this but I am not sure how one can use twisted with django
. Are there any other solutions that i can use for this problem .

Thanks
Amit

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Handling Efficiency issues

[Amit Sethi]

Hi all for some reason i am doing something like this
 for i in Message.objects.all():
i.read_at = datetime.now()
i.save()

now the number of Message instances are likely to increase by a lot
with time . My question is is it likely that this code piece will
become very slow over time. If yes how can handle this more
efficiently

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Efficiently querying db

[Amit Sethi]

I have a db that looks something like  this .

{ message : xyz
 parent : 23
 id : 25
}
 or
{ message : abc
parent : None
id : 25
}

{ message : cde
parent : 28
id : 32
}

{ message : lbq
parent : 23
id : 35
}

I want to make seperate the lists such that messages in same thread(
The parent message and its child messages } come together . What is
the best way to query the db or a efficient algorithm to do this.


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Re: Integrity Error with generic relation using ContentType

[Amit Sethi]

On Tue, Jun 14, 2011 at 8:00 PM, christian.posta
 wrote:
> Yes, it is. Any reason why you want the content-types to be part of
> your fixtures? Why not let django build that up by itself?
>
Well essentially it was just a dumpdata from earlier that is being
used. But why should I not have it as part of fixtures ?


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Re: Integrity Error with generic relation using ContentType

[Amit Sethi]

On Tue, Jun 14, 2011 at 1:41 AM, christian.posta
 wrote:
> Are you using your own fixtures (like initial_data.json)?
> Is it possible that in your initial_data.json ( or whatever fixture
> you're using) that you're including entries into the content_types
[..]

Well i do have entries of the kind this :
 {
"pk": 47,
"model": "contenttypes.contenttype",
"fields": {
"model": "user",
"name": "user",
"app_label": "auth"
}
},

Are these what you are referring to ..

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Integrity Error with generic relation using ContentType

[Amit Sethi]

Hi all , I am trying to introduce some messaging capability in my app.
I tried to create a generic relation between some part of my messaging
app and a model in one of my previous apps. However when fixtures load
I get this error. I am not able to make head and tail of this . What
is happening can some explain to me

IntegrityError: duplicate key value violates unique constraint
"django_content_type_app_label_key"

Also what is the possible solution .


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Re: Reasons to use managers

[Amit Sethi]

> functionality to your models. (For "row-level" functionality -- i.e.,
> functions that act on a single instance of a model object -- use Model
> methods, not custom Manager methods.)
>

But what is the benefit of model methods compared to adding an extra
field and getting almost the same thing done

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Reasons to use managers

[Amit Sethi]

Hi all , I have a situation in which i am contemplating using an extra
field although the same thing can be done using a manager(although the
function may take some time). In this situation normalization isn't
actually a priority. Are there some other reasons to use a manager.
Also what would be the difference in terms of efficiency.

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Re: Slightly cryptic debug message

[Amit Sethi]

Well for example :

"""
Exception Type: TemplateSyntaxError
Exception Value:
Caught NameError while rendering: global name 'approved' is not defined

"""

I don't understand if it is a NameError why should django say
TemplateSyntax error when exception value it says it got caught a
NameError

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Slightly cryptic debug message

[Amit Sethi]

Hi all , I have a question , On the the new versions of django (after
1.2) a lot of syntax errors and other errors come as Templatesyntax
errors instead .. . Shouldn't django try to give more compatible debug
message.
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Re: South migration for fixtures

[Amit Sethi]

And what process should be followed in production and for other collaborators.


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South migration for fixtures

[Amit Sethi]

Hi all , I might be wrong with some of the concepts as I am new to
south. I am using south to migrate some fixture data for a django app.
Also something worth noting is I am bringing south new into the django
app it was not part of installed apps till now . So the workflow I
have followed till now is

run syncdb to install south
create a fake initial migration using convert_to_south command
create the actual schema migration script for my app using --auto
create a data migration script with a forward function for the added field

run python manage.py migrate myapp

Now obviously I get an error related to fixtures not getting installed
. Because I haven't actually changed the data on my fixtures how can I
do that(Also when should I do that) . My confusion also is that if I
dump data now to create new fixtures I will be creating trouble for my
collaborators since when they run syncdb to install south
in the end of syncdb when fixtures are installed they will
have problems because of the change in fixtures ??

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Re: form being deleted from base.html

[Amit Sethi]

Hi all sorry it was an issue with my html.

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Re: GET/POST

[Amit Sethi]

I think this is csrfmiddleware issue . Just add {% csrf_token %} like this
 {% csrf_token %}


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form being deleted from base.html

[Amit Sethi]

Hi all , I am not able to understand this but it seems while extending
the base template removes form tag. Is this possible in some scenario.
This is the only explanation I am able to come up with for the
behavior I am seeing in my app.

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sqlite3 and south data migration

[Amit Sethi]

Hi all does sqlite3  not support data migration. I am trying to
implement migration on my test fixtures using
south however i get this particular error :

AttributeError: 'DatabaseFeatures' object has no attribute
'supports_tablespaces'

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field specific error message

[Amit Sethi]

How do you do field specific messages ... like for  a Telephone Number , if
all characters are not digit send
message (no invalid )  . I have tried raising forms.ValidationError like
specified here (http://www.djangosnippets.org/snippets/337/)

I have also tried changing forms.Form._errors ... it is this string that
seems to be used
by forms.Form._html_output to put errors in final html .. but still it does
not work for me can some one tell me how to do the above specified thing


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Text Search using Python

[Amit Sethi]

Hi , I have  a project with a few static html pages , I wish to search these
static html using a django search app . Most of the tutorials I saw are
focused on searching django models but none I could see concentrates on
indexing static html pages . Can some one guide be to a library /tutorial
etc for searching and indexing static pages in a project .

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Possibility of recursive rendering

[Amit Sethi]

Hi I wish  to know if it is possible to use recursive rendering ? . What I
mean by that is that their is a template which renders no of comments on a
paragraph . SInce their are many paragraphs what i wish to send is  a list
of render_to_response calls for each paragraph. i.e send response messages
from a loop etc ...

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Using django only for request handling work

[Amit Sethi]

Hi ,I have a project that is in general written to work with wsgi server
except i wish to alter some of the environ variables provided to the app. So
I have a function:

def __call__(self, environ, start_response):   In this I want to change some
part of environ 

So my application looks something like this


apache server --->> django to do url handling and changing environ  --->>
the actual app

This is my initial brainstorm . I really don't understand if it is possible
to do this . How do I create the same kind of interface like apache or any
other server i.e environ and start_response to be sent to the app???

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Help with apache mod rewrite engine

[Amit Sethi]

Hi all , I need some help understanding the mod rewrite module of apache .
What I wished to do want that i had a comments folder by the name of
/comments/ . Now i run a django project on /sees and i want all the call to
/comments/ be redirected to /sees/comments and than be handled by the wsgi
file but the rewriting is not happening is it possible to rewrite url and
than route it through wsgi script

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modwsgi on suburl

[Amit Sethi]

Hi , can somebody tell me how i should configure mod_wsgi on a suburl I want
to set a django project on

domain.com/test/

so my urls.py at present looks like :

urlpatterns = patterns('',
 (r'^(.*)', 'sttp.views.serve'),)

and the wgi scrip alias is WSGIScriptAlias /test
/home/amit/sttp-project/django.wsgi


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how to import a library in only in django project

[Amit Sethi]

Hi ,
I want to use a library in a django project but I don't want to put it in
python path. Where am I supposed to put the sys.append so that it will
available to the whole django project.
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how to serve multiple files using mod_wsgi

[Amit Sethi]

Hi , I have been trying to make a project work with mod_wsgi under
apache . The project is not exactly in django . It has a development
server of its own for adapting I was using this as a reference .The
mod_wsgi manual says that you have to send the response in following
manner

def application(environ, start_response):
status = '200 OK'
output = 'Hello World!'

response_headers = [('Content-type', 'text/plain'),
('Content-Length', str(len(output)))]
start_response(status, response_headers)

return [output]

Now this is fine it you have one file to serve but i need to serve
multiple files a sample call on the development server is :

localhost - - [19/Nov/2009 16:29:16] "GET /_static/basic.css HTTP/1.1" 200 6385
public/_static/jquery.js
localhost - - [19/Nov/2009 16:29:16] "GET /_static/jquery.js HTTP/1.1" 200 55774
public/_static/doctools.js
localhost - - [19/Nov/2009 16:29:16] "GET /_static/doctools.js
HTTP/1.1" 200 6618
public/_static/jquery.form.js
localhost - - [19/Nov/2009 16:29:16] "GET /_static/jquery.form.js
HTTP/1.1" 200 23288
public/_static/comments.js
localhost - - [19/Nov/2009 16:29:16] "GET /_static/comments.js
HTTP/1.1" 200 20337
localhost - - [19/Nov/2009 16:29:16] "HEAD
/comments/803b4d0984c5317e5800109ec12bb439 HTTP/1.1" 200 0
localhost - - [19/Nov/2009 16:29:16] "HEAD
/fixes/803b4d0984c5317e5800109ec12bb439 HTTP/1.1" 404 0
localhost - - [19/Nov/2009 16:29:16] "GET
/comments/803b4d0984c5317e5800109ec12bb439?id=803b4d0984c5317e5800109ec12bb439
HTTP/1.1" 200 464

How do I create a script that can serve all these files ?  I am sure
django has a way in which it does the same thing what is it. Any
reference to code i should look at?



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Re: first project taking it too production server

[Amit Sethi]

Hi , I was able to run it for the time being using mod_proxy but is
this is good way . What are the possible problems because of it.

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Re: first project taking it too production server

[Amit Sethi]

yes I do have ssh access and the server does have python on it.

On Tue, Nov 17, 2009 at 7:02 AM, Kenneth Gonsalves <law...@au-kbc.org> wrote:
> On Monday 16 Nov 2009 7:41:47 pm Amit Sethi wrote:
>> Hi , I just developed my first small app using django , I wish to
>> deploy it . I have a apache server with drupal running on it . Can
>> anybody guide me about the procedure i should use to deploy the
>> project without disturbing the drupal installation in any way...
>>
>
> do you have shell access? is python *really* available (not just the binary,
> but all the modules?
> --
> regards
> Kenneth Gonsalves
> Senior Project Officer
> NRC-FOSS
> http://nrcfosshelpline.in/web/
>
> --
>
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first project taking it too production server

[Amit Sethi]

Hi , I just developed my first small app using django , I wish to
deploy it . I have a apache server with drupal running on it . Can
anybody guide me about the procedure i should use to deploy the
project without disturbing the drupal installation in any way...

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Re: Following part 2 of the tutorial, I get the following error when trying to view /admin/:

[Amit Sethi]

On Fri, Jul 24, 2009 at 6:04 PM, ashish wrote:
Well as your error message says , Template does not exist my first
guess would be that you did not Activate the admin site .. if that is
not so , you should have  a look at the section , Customize the look
and feel of admin ... it is talking about the basics of Django's
templating system .


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Re: Hi people

[Amit Sethi]

Take up a small project like the tutorial...

On Wed, Jul 22, 2009 at 1:00 PM, Vasil
Vangelovski wrote:
>
> A good place to start is the tutorial:
>
> http://docs.djangoproject.com/en/dev/intro/tutorial01/
>
> If you are new to python you can also check dive into python:
>
> http://diveintopython.org/
>
> On Wed, Jul 22, 2009 at 10:52 AM, sudharsan s wrote:
>>
>> Hi i am new to django . i have interest towrds programing..so i need
>> some help how to start  with django i went through the official
>> documentation of django and i also installed it.. after that i don
>> know how to proceed
>>
>> >
>>
>
> >
>



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Re: How to get this value

[Amit Sethi]

I am not sure what you are trying to do. And the code seems almost unreadable .
You could try posting the code to : http://pastebin.com/

Also what might be helpful:
What is the problem statement what is this code trying to solve ?

What value you want  and  where ?

And what error does django give ...






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Help regarding how to deliver a particular project

[Amit Sethi]

I hope i am not breaking any code here and i don't get mails saying its not
the place to discuss this .

I am trying to create a small xml-rpc like service which uses some other
multiple  REST/JSON based web services . I am using django because I like
simple organized architecture it gives for development. I have collected
results in a python dictionary like this .

{'SOURCE':Google ,'results':[{result_no:1,url:http://url}]} etc.
{'Source':Yahoo,'results':[{result_no:1,url:http://url}]} etc

Now i need to collect these result but the problem is that their may be many
redundant repeated results . Their may be other stuff that i may need to do
on this data. But I don't need to retain the data once it is delivered to
the client .
Should I save this data using django models for temprory purpose .
How can django models help me especially in terms of finding redundant data.

How exactly are django models different from databases.
Also I may deliver this app using Google app Engine . Now to me It doesn't
seem that app engine DataStore API does not seem very different . What are
the differences at the application developer's level?

Looking forward to the responses
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Searching disparate databases

[Amit Sethi]

Hi all ,
   I am trying to develop a web app that searches products on some
local stores and give the price.Now I can obviously have a format for stores
to feed my database but rather than that .What I want is that the local
stores be able to dump their database/feeds on my Server . It would make
adding a store a breeze . But the problem is that these databases / feeds
might be very different . The datamodels might be very different . So how do
I integrate such databases. I just need to extract the product and its price
from a store.
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Re: serving static files

[amit sethi]

hi thanks ,
well got the point about url-conf the url pattern you have given does not
raise the error but i have still not been able to get my css working
my urls.py has an entry
(r'^sitemedia/?P.*$', 'django.views.static.serve',
{'document_root': '/home/amit/analytics/sitemedia', 'show_indexes':
True })

my css file is at path '/home/amit/analytics/sitemedia/default.css'

my template has the link to css


>
> i know this might be very basic but i have just started to try my hand at
> this .
>



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serving static files

[amit sethi]

Hi , i am new to django and i am trying to serve my css file .
I followed the instruction to serve  static files in development server and
made a seperate /media directory
I copied my css file into it

and changed the url pattern to include:
(r'^site_media/default.css$', 'django.views.static.serve',
{'document_root': '/home/amit/analytics/media', 'show_indexes': True
}),
now i get the error
serve() takes at least 2 non-keyword arguments (1 given)
i am new to web development please help
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