ListField with ForeignKeys

[wrwrwr]

Nearly works with Mongo (somewhat similar to issue 47 there), might be expressive in some cases.

def test_list_with_foreignkeys(self):
    class Model(models.Model):
        pass
    class ReferenceList(models.Model):
        keys = ListField(models.ForeignKey(Model))
    model1 = Model.objects.create()
    model2 = Model.objects.create()
    ReferenceList.objects.create(keys=[model1, model2])
    self.assertEqual(
        Model.objects.get(pk=ReferenceList.objects.all()[0].keys[0]),
        model1)

[jonashaag]

LGTM. .all()[0] should be expressed as .get().

[wrwrwr]

Right, but actually it works if you use model.pk when creating the list.

def test_list_with_foreignkeys(self):
    class Model(models.Model):
        pass
    class ReferenceList(models.Model):
        keys = ListField(models.ForeignKey(Model))
    model1 = Model.objects.create()
    model2 = Model.objects.create()
    ReferenceList.objects.create(keys=[model1.pk, model2.pk])
    self.assertEqual(ReferenceList.objects.get().keys[0], model1.pk)
    self.assertEqual(
        Model.objects.get(pk=ReferenceList.objects.get().keys[0]),
        model1)

The following doesn't work with Mongo however:

self.assertEqual(len(ReferenceList.objects.filter(keys=model1.pk)), 1)

[jonashaag]

That's no good. Does it crash? If it does, what's the stacktrace? If it doesn't, what Mongo query is used and what does the ReferenceList object look like in MongoDB?