Generic Many-To-Many Relationships
I have a collection class which contains arbitrary objects using a
Generic Many-To-Many relationship.
class Collection(models.Model):
name = models.CharField(max_length=VERBOSE_NAME_MAX_LENGTH)
def member_objects(self, klass):
"""Returns a QuerySet of all objects in the collection of the
given class."""
# Should be stuff here.
pass
class ObjectInCollection(models.Model):
collection = models.ForeignKey(Collection)
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
object = generic.GenericForeignKey()
class ExampleObject(models.Model):
# Stuff here
# I don't want to rely on the following generic relation.
oics = generic.GenericRelation(ObjectInCollection,
related_name='example_object')
My problem is the member_objects method. If I give all the object
classes that might be included in the collection a GenericRelation (as
in ExampleObject) then I can use:
def member_objects(self, klass)
return klass.objects.filter(oics__collection__id=self.id)
But I don't want to rely on having this in all the classes (because
the classes might be in other applications or there might be multiple
collection classes).
I could use a klass.objects.raw custom SQL method but that wouldn't
return a QuerySet which I would prefer.
Is there a way to do this that:
1) does not require a GenericRelation in all classes and
2) returns a QuerySet?
Cheers.
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