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"""
Regression tests for custom manager classes.
"""
from django.db import models
class RestrictedManager(models.Manager):
"""
A manager that filters out non-public instances.
"""
def get_query_set(self):
return super(RestrictedManager, self).get_query_set().filter(is_public=True)
class RelatedModel(models.Model):
name = models.CharField(max_length=50)
def __unicode__(self):
return self.name
class RestrictedModel(models.Model):
name = models.CharField(max_length=50)
is_public = models.BooleanField(default=False)
related = models.ForeignKey(RelatedModel)
objects = RestrictedManager()
plain_manager = models.Manager()
def __unicode__(self):
return self.name
class OneToOneRestrictedModel(models.Model):
name = models.CharField(max_length=50)
is_public = models.BooleanField(default=False)
related = models.OneToOneField(RelatedModel)
objects = RestrictedManager()
plain_manager = models.Manager()
def __unicode__(self):
return self.name
__test__ = {"tests": """
Even though the default manager filters out some records, we must still be able
to save (particularly, save by updating existing records) those filtered
instances. This is a regression test for #8990, #9527
>>> related = RelatedModel.objects.create(name="xyzzy")
>>> obj = RestrictedModel.objects.create(name="hidden", related=related)
>>> obj.name = "still hidden"
>>> obj.save()
# If the hidden object wasn't seen during the save process, there would now be
# two objects in the database.
>>> RestrictedModel.plain_manager.count()
1
Deleting related objects should also not be distracted by a restricted manager
on the related object. This is a regression test for #2698.
>>> RestrictedModel.plain_manager.all().delete()
>>> for name, public in (('one', True), ('two', False), ('three', False)):
... _ = RestrictedModel.objects.create(name=name, is_public=public, related=related)
# Reload the RelatedModel instance, just to avoid any instance artifacts.
>>> obj = RelatedModel.objects.get(name="xyzzy")
>>> obj.delete()
# All of the RestrictedModel instances should have been deleted, since they
# *all* pointed to the RelatedModel. If the default manager is used, only the
# public one will be deleted.
>>> RestrictedModel.plain_manager.all()
[]
# The same test case as the last one, but for one-to-one models, which are
# implemented slightly different internally, so it's a different code path.
>>> obj = RelatedModel.objects.create(name="xyzzy")
>>> _ = OneToOneRestrictedModel.objects.create(name="foo", is_public=False, related=obj)
>>> obj = RelatedModel.objects.get(name="xyzzy")
>>> obj.delete()
>>> OneToOneRestrictedModel.plain_manager.all()
[]
"""
}
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