On Tue, 2010-01-05 at 04:17 -0800, bruno desthuilliers wrote:
>
> On 5 jan, 00:05, HARRY POTTRER <cp368...@ohio.edu> wrote:
> > I have an class that I created which takes a queryset, and a field on
> > the model that the queryset represents. Like this:
> >
> > mc = MyClass(queryset=MyModel.objects.all(), lat_lng_field='lat_lng')
> >
> > The class basically filters the queryset based on some geographical
> > values, but in order to do that, it needs to know which field the
> > coordinates are stored in.
> >
> > Right now I have no choice but require you to pass in a string
> > representing the field name. But I think a better way would be to do
> > it kind of like this:
> >
> > class MyModel(models.Model):
> > lat_lng = PointField()
> > name = CharFIeld(max_length=20)
> >
> > class Meta:
> > verbose_name_plural = 'My Models'
> > lat_lng_field = 'lat_lng'
> >
> > Then just modify MyClass to get the field name from the Model's Meta
> > class. Is this possible somehow?
>
> Did you at least try ? It took me about 5 seconds to find out it
> wouldn't work... or at least not without a very ugly monkeypatch.
>
>
> > If not, whats the best way to go
> > about this without having to pass in the field name directly?
>
> You can
>
> 1/ store the info as a class attribute
>
> class MyModel(models.Model):
> lat_lng_field = 'lat_lng'
>
> # etc
>
> 2/ store all "geographic" related infos in another inner class in your
> models (not worth if you only have a single info...)
>
> 3/ add the attribute _after_ the class statement's body, ie:
>
>
> class MyModel(models.Model):
> # stuff here
>
> MyModel._meta.lat_lng_field = 'lat_lng'
>
>
> 4/ monkeypatch django.db.models.options to allow "lat_lng_field" in
> Meta (very bad idea IMHO)
>
> or simply:
>
> 5/ document the fact that the 'lat_lng' field name MUST be named
> 'lat_lng', period !-)
>
>
> My 2 cents...
>
Or... :)
from django.db import models
models.options.DEFAULT_NAMES += ('my_first_val', 'my_second_val')
class MyModel(models.Model):
class Meta:
my_first_val = 'foo'
my_second_val = 'bar'
Amazing, isn't it?
--
Jani Tiainen
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