Can I limit the choices in a ContentType field in admin?
Adam Stein
lists all the models. Since I only ever need to select 1 of 2 different
models, anyway to limit the choice?
Setting the choices attribute as Django complains
must be a "ContentType" instance
ContentType.objects.get() returns an instance of a particular model, not
ContentType (as one would expect), so I'm not sure how to create an
instance with the particulars I need to point to something specific in
the choices list. Here's what I have:
from django.db import models
from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes import generic
class GenericFKExample(models.Model):
CHOICES = (
(ContentType.objects.get(model="model1"), "Model 1"),
(ContentType.objects.get(model="model2"), "Model 2"),
)
content_type = models.ForeignKey(ContentType,
choices = CHOICES,
null = True,
)
object_id = models.PositiveIntegerField(
null = True,
)
content_object = generic.GenericForeignKey(
"content_type", "object_id"
)
Obviously, if I don't use choices, it works but then I have a very long
list of model choices.
--
Adam Stein @ Xerox Corporation Email: ad...@eng.mc.xerox.com
Disclaimer: Any/All views expressed
here have been proven to be my own. [http://www.csh.rit.edu/~adam/]
Lee
change your method in CHOICES to get_for_model( _model_ )
So it should be
CHOICES = (
(ContentType.objects.get_for_model(My_Model), "Model 1"),
(ContentType.objects.get_for_model(My_Other_Model), "Model
2"),
)
Obviously, make sure you import your model before you try to use it.
Adam Stein
works.
Lee
work... I ended up using the following:
from MyProject.MyApp.models import MyModel
CONTENT_TYPE_CHOICES = (ContentType.objects.get_for_model
(MyModel).id,)
class My_Other_Model(models.Model):
content_type = models.ForeignKey(ContentType, limit_choices_to=
{'id__in': CONTENT_TYPE_CHOICES})
Adam Stein
than the ID:
data_type = models.ForeignKey(ContentType,
limit_choices_to = {"model__in": ("model1", "model2")},
)