On 5 jan, 00:05, HARRY POTTRER <[email protected]> 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...
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