Django users Google Group

newbie question: .is_valid seems non-Boolean?

2009-12-20T13:17:30Z

I'm following the The Django Book 2.0, trying to learn Django.
I'm on Apple OS X10.5.8, Python 2.5.1.
I have looked at FAQ, mailing lists, etc. but did not find any
situation looking like this.
Question:
although all other parts seem to work as described in the book,
the .is_valid returns an unexpected non Boolean answer - how to addres

announcement: SHPAML (alternative to haml)

2009-12-20T04:04:35Z

Hi, I have ported some haml concepts to Python in my implementation of
SHPAML. Details here:
[link]
For those of you not aware of haml, haml is a markup language
implemented in Ruby that allows you to eliminate end tags in HTML.
Like Python itself, haml and SHPAML use indentation to eliminate the

choice model with objects.values_list options

2009-12-20T03:27:05Z

Hey just a newbie question about the design of the models.py What is
the best way to use the result of objects.values_list for a choices
model ?
********************** shell *******************
In [1]: from photos.models import Image, Pool
In [3]: Image.objects.values_list('ima ge')
Out[3]: [(u'photologue/photos/wielrenf iets.jpg',), (u'photologue/

install question:django-admin.py for help

2009-12-20T00:04:11Z

Hi,
I am trying to get started with django on windows vista. I have
successfully installed it as "import django" works in python.
However, whenever I try at the command prompt
"django-admin.py startproject myproject"
I get "Type 'django-admin.py help' for usage".
I have tried four installs on 3 different machines and each time I get

Is this right: Modifying the admin changelist?

2009-12-19T22:54:43Z

Hi,
I wanted a "sum" of a particular column being listed in the admin list
page. I looked it up and did it the following way. Is this the correct
way of doing it?
I modified the admin.py to do the calculation:
class CollectionAdmin(admin.ModelAdm in):
list_display = ('supplier', 'collected_date', 'tonnage',)

Combine multiple Autopaginate on 1 page

2009-12-19T20:30:50Z

Guys got 2 columns generated by
<td width="450px">
{% autopaginate blogs_one 3 %}
{% for blog_post in blogs_one %}
{% show_blog_post blog_post %}
{% endfor %}
{% paginate %}
</td>
<td>
{% autopaginate blogs_two 3 %}
{% for blog_post in blogs_two %}

very noob : DRY violation in views.py

2009-12-19T18:14:11Z

VIEWS:
def services(request):
property = Property.objects.all().order_b y('name')[:4]
city = City.objects.all()
category=PropertyCategory.obje cts.all()
status=PropertyStatus.objects. all()
return render_to_response('website/se rvices.html',{'property':
property, 'city':city,'category':categor y,'status':status})

Migrating ForeignField to OneToOneField

2009-12-19T11:34:46Z

I'm using South to migrate a certain field from ForeignField to
OneToOneField.
Initial state is that I have model A pointing to model B using a
ForeignField. Of course there's only one instance of A pointing to a B
instance.
I wasn't sure if this would work directly, or that I should do a 3-
stage migration (1- add a different field, 2- copy the id from

Feeds from the Tag Framework

2009-12-19T12:01:06Z

Hi Folks,
The complex example of an Atom feed
([link])
is based on a model where it's possible to work out from a single
element in the feed (in this case a Crime), what the driving object is
(a Beat). So there's a many (Crime) to one (Beat) relationship going on.

question about django-pagination

2009-12-19T06:33:43Z

In the django-pagination, it uses the example:
{% autopaginate object_list %}
My question is does object_list have to be the **entire** list over
which I want to paginate, or can I limit the length of object_list? If
I limit the length of object_list, will autopaginate still go through
the entire list?

SQL transaction style in django?

2009-12-19T05:58:04Z

Hi,
I read that we can overwrite the save() for any model to do something
before/after its save. But my issue is, how can I be sure that what i
save + what the model needs to save happen as a transaction, so if
either fails, the whole thing fails.
Example. I want to keep a total inventory count in a model called

feedparser import error

2009-12-19T02:37:44Z

Hello,
I've installed pydelicious and it seems to work until it imports
feedparser.py. I've installed feedparser.py, and it's in the same
directory as pydelicious. When pydelicious tries to import
feedparser.py my app crashes. I get 'No module named feedparser'. Does
anyone know why feedparser.py isn't importing? Has anyone else had

authentication security

2009-12-19T00:58:59Z

I am reading the django book. I just finished the chapter on
authentication. I get the jist of it. What I don't understand is the
overall security of authentication. If everything you do is passed as
plain text then it isn't very secure. Okay so https comes in. What I
don't understand is when to use it and when not to. It seems like if

Rails-style form value deserializer?

2009-12-19T00:27:26Z

One thing I'm keenly missing from rails is the form input naming convention that causes the form values to be converted into a hierarchy. For instance,
<input name="foo[bar]" value"one">
<input name="foo[baz]" value="two">
will result in the request values being stored as { 'foo' : {'bar' : 'one', 'baz' : 'two' }}

attachments vs filebrowser

2009-12-19T00:24:00Z

I need users to attach arbitrary media files to database records. Attachments seems to do what I need, except that its UI is utterly lame - it should figure out the media type of the file from the extension and display an appropriate thumbnail as well as a way to provide a viewer inline. Also, it relies on a bunch of custom tags for django's template processor but I'm using jinja2.