379 lines
13 KiB
Python
379 lines
13 KiB
Python
from __future__ import unicode_literals
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from django.db import models, IntegrityError, connection
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from django.test import TestCase, skipUnlessDBFeature, skipIfDBFeature
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from django.utils.six.moves import xrange
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from .models import (R, RChild, S, T, U, A, M, MR, MRNull,
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create_a, get_default_r, User, Avatar, HiddenUser, HiddenUserProfile,
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M2MTo, M2MFrom, Parent, Child, Base)
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class OnDeleteTests(TestCase):
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def setUp(self):
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self.DEFAULT = get_default_r()
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def test_auto(self):
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a = create_a('auto')
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a.auto.delete()
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self.assertFalse(A.objects.filter(name='auto').exists())
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def test_auto_nullable(self):
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a = create_a('auto_nullable')
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a.auto_nullable.delete()
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self.assertFalse(A.objects.filter(name='auto_nullable').exists())
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def test_setvalue(self):
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a = create_a('setvalue')
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a.setvalue.delete()
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a = A.objects.get(pk=a.pk)
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self.assertEqual(self.DEFAULT, a.setvalue)
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def test_setnull(self):
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a = create_a('setnull')
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a.setnull.delete()
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a = A.objects.get(pk=a.pk)
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self.assertEqual(None, a.setnull)
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def test_setdefault(self):
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a = create_a('setdefault')
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a.setdefault.delete()
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a = A.objects.get(pk=a.pk)
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self.assertEqual(self.DEFAULT, a.setdefault)
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def test_setdefault_none(self):
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a = create_a('setdefault_none')
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a.setdefault_none.delete()
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a = A.objects.get(pk=a.pk)
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self.assertEqual(None, a.setdefault_none)
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def test_cascade(self):
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a = create_a('cascade')
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a.cascade.delete()
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self.assertFalse(A.objects.filter(name='cascade').exists())
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def test_cascade_nullable(self):
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a = create_a('cascade_nullable')
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a.cascade_nullable.delete()
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self.assertFalse(A.objects.filter(name='cascade_nullable').exists())
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def test_protect(self):
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a = create_a('protect')
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self.assertRaises(IntegrityError, a.protect.delete)
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def test_do_nothing(self):
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# Testing DO_NOTHING is a bit harder: It would raise IntegrityError for a normal model,
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# so we connect to pre_delete and set the fk to a known value.
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replacement_r = R.objects.create()
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def check_do_nothing(sender, **kwargs):
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obj = kwargs['instance']
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obj.donothing_set.update(donothing=replacement_r)
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models.signals.pre_delete.connect(check_do_nothing)
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a = create_a('do_nothing')
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a.donothing.delete()
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a = A.objects.get(pk=a.pk)
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self.assertEqual(replacement_r, a.donothing)
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models.signals.pre_delete.disconnect(check_do_nothing)
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def test_do_nothing_qscount(self):
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"""
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Test that a models.DO_NOTHING relation doesn't trigger a query.
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"""
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b = Base.objects.create()
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with self.assertNumQueries(1):
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# RelToBase should not be queried.
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b.delete()
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self.assertEqual(Base.objects.count(), 0)
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def test_inheritance_cascade_up(self):
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child = RChild.objects.create()
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child.delete()
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self.assertFalse(R.objects.filter(pk=child.pk).exists())
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def test_inheritance_cascade_down(self):
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child = RChild.objects.create()
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parent = child.r_ptr
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parent.delete()
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self.assertFalse(RChild.objects.filter(pk=child.pk).exists())
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def test_cascade_from_child(self):
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a = create_a('child')
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a.child.delete()
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self.assertFalse(A.objects.filter(name='child').exists())
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self.assertFalse(R.objects.filter(pk=a.child_id).exists())
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def test_cascade_from_parent(self):
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a = create_a('child')
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R.objects.get(pk=a.child_id).delete()
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self.assertFalse(A.objects.filter(name='child').exists())
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self.assertFalse(RChild.objects.filter(pk=a.child_id).exists())
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def test_setnull_from_child(self):
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a = create_a('child_setnull')
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a.child_setnull.delete()
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self.assertFalse(R.objects.filter(pk=a.child_setnull_id).exists())
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a = A.objects.get(pk=a.pk)
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self.assertEqual(None, a.child_setnull)
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def test_setnull_from_parent(self):
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a = create_a('child_setnull')
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R.objects.get(pk=a.child_setnull_id).delete()
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self.assertFalse(RChild.objects.filter(pk=a.child_setnull_id).exists())
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a = A.objects.get(pk=a.pk)
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self.assertEqual(None, a.child_setnull)
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def test_o2o_setnull(self):
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a = create_a('o2o_setnull')
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a.o2o_setnull.delete()
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a = A.objects.get(pk=a.pk)
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self.assertEqual(None, a.o2o_setnull)
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class DeletionTests(TestCase):
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def test_m2m(self):
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m = M.objects.create()
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r = R.objects.create()
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MR.objects.create(m=m, r=r)
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r.delete()
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self.assertFalse(MR.objects.exists())
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r = R.objects.create()
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MR.objects.create(m=m, r=r)
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m.delete()
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self.assertFalse(MR.objects.exists())
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m = M.objects.create()
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r = R.objects.create()
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m.m2m.add(r)
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r.delete()
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through = M._meta.get_field('m2m').rel.through
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self.assertFalse(through.objects.exists())
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r = R.objects.create()
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m.m2m.add(r)
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m.delete()
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self.assertFalse(through.objects.exists())
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m = M.objects.create()
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r = R.objects.create()
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MRNull.objects.create(m=m, r=r)
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r.delete()
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self.assertFalse(not MRNull.objects.exists())
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self.assertFalse(m.m2m_through_null.exists())
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def test_bulk(self):
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from django.db.models.sql.constants import GET_ITERATOR_CHUNK_SIZE
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s = S.objects.create(r=R.objects.create())
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for i in xrange(2*GET_ITERATOR_CHUNK_SIZE):
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T.objects.create(s=s)
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# 1 (select related `T` instances)
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# + 1 (select related `U` instances)
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# + 2 (delete `T` instances in batches)
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# + 1 (delete `s`)
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self.assertNumQueries(5, s.delete)
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self.assertFalse(S.objects.exists())
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def test_instance_update(self):
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deleted = []
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related_setnull_sets = []
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def pre_delete(sender, **kwargs):
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obj = kwargs['instance']
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deleted.append(obj)
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if isinstance(obj, R):
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related_setnull_sets.append(list(a.pk for a in obj.setnull_set.all()))
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models.signals.pre_delete.connect(pre_delete)
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a = create_a('update_setnull')
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a.setnull.delete()
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a = create_a('update_cascade')
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a.cascade.delete()
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for obj in deleted:
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self.assertEqual(None, obj.pk)
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for pk_list in related_setnull_sets:
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for a in A.objects.filter(id__in=pk_list):
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self.assertEqual(None, a.setnull)
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models.signals.pre_delete.disconnect(pre_delete)
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def test_deletion_order(self):
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pre_delete_order = []
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post_delete_order = []
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def log_post_delete(sender, **kwargs):
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pre_delete_order.append((sender, kwargs['instance'].pk))
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def log_pre_delete(sender, **kwargs):
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post_delete_order.append((sender, kwargs['instance'].pk))
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models.signals.post_delete.connect(log_post_delete)
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models.signals.pre_delete.connect(log_pre_delete)
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r = R.objects.create(pk=1)
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s1 = S.objects.create(pk=1, r=r)
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s2 = S.objects.create(pk=2, r=r)
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T.objects.create(pk=1, s=s1)
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T.objects.create(pk=2, s=s2)
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r.delete()
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self.assertEqual(
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pre_delete_order, [(T, 2), (T, 1), (S, 2), (S, 1), (R, 1)]
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)
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self.assertEqual(
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post_delete_order, [(T, 1), (T, 2), (S, 1), (S, 2), (R, 1)]
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)
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models.signals.post_delete.disconnect(log_post_delete)
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models.signals.pre_delete.disconnect(log_pre_delete)
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def test_relational_post_delete_signals_happen_before_parent_object(self):
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deletions = []
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def log_post_delete(instance, **kwargs):
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self.assertTrue(R.objects.filter(pk=instance.r_id))
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self.assertIs(type(instance), S)
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deletions.append(instance.id)
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r = R.objects.create(pk=1)
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S.objects.create(pk=1, r=r)
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models.signals.post_delete.connect(log_post_delete, sender=S)
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try:
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r.delete()
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finally:
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models.signals.post_delete.disconnect(log_post_delete)
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self.assertEqual(len(deletions), 1)
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self.assertEqual(deletions[0], 1)
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@skipUnlessDBFeature("can_defer_constraint_checks")
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def test_can_defer_constraint_checks(self):
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u = User.objects.create(
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avatar=Avatar.objects.create()
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)
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a = Avatar.objects.get(pk=u.avatar_id)
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# 1 query to find the users for the avatar.
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# 1 query to delete the user
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# 1 query to delete the avatar
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# The important thing is that when we can defer constraint checks there
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# is no need to do an UPDATE on User.avatar to null it out.
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# Attach a signal to make sure we will not do fast_deletes.
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calls = []
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def noop(*args, **kwargs):
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calls.append('')
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models.signals.post_delete.connect(noop, sender=User)
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self.assertNumQueries(3, a.delete)
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self.assertFalse(User.objects.exists())
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self.assertFalse(Avatar.objects.exists())
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self.assertEqual(len(calls), 1)
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models.signals.post_delete.disconnect(noop, sender=User)
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@skipIfDBFeature("can_defer_constraint_checks")
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def test_cannot_defer_constraint_checks(self):
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u = User.objects.create(
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avatar=Avatar.objects.create()
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)
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# Attach a signal to make sure we will not do fast_deletes.
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calls = []
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def noop(*args, **kwargs):
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calls.append('')
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models.signals.post_delete.connect(noop, sender=User)
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a = Avatar.objects.get(pk=u.avatar_id)
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# The below doesn't make sense... Why do we need to null out
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# user.avatar if we are going to delete the user immediately after it,
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# and there are no more cascades.
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# 1 query to find the users for the avatar.
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# 1 query to delete the user
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# 1 query to null out user.avatar, because we can't defer the constraint
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# 1 query to delete the avatar
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self.assertNumQueries(4, a.delete)
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self.assertFalse(User.objects.exists())
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self.assertFalse(Avatar.objects.exists())
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self.assertEqual(len(calls), 1)
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models.signals.post_delete.disconnect(noop, sender=User)
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def test_hidden_related(self):
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r = R.objects.create()
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h = HiddenUser.objects.create(r=r)
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HiddenUserProfile.objects.create(user=h)
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r.delete()
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self.assertEqual(HiddenUserProfile.objects.count(), 0)
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class FastDeleteTests(TestCase):
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def test_fast_delete_fk(self):
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u = User.objects.create(
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avatar=Avatar.objects.create()
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)
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a = Avatar.objects.get(pk=u.avatar_id)
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# 1 query to fast-delete the user
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# 1 query to delete the avatar
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self.assertNumQueries(2, a.delete)
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self.assertFalse(User.objects.exists())
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self.assertFalse(Avatar.objects.exists())
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def test_fast_delete_m2m(self):
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t = M2MTo.objects.create()
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f = M2MFrom.objects.create()
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f.m2m.add(t)
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# 1 to delete f, 1 to fast-delete m2m for f
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self.assertNumQueries(2, f.delete)
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def test_fast_delete_revm2m(self):
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t = M2MTo.objects.create()
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f = M2MFrom.objects.create()
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f.m2m.add(t)
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# 1 to delete t, 1 to fast-delete t's m_set
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self.assertNumQueries(2, f.delete)
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def test_fast_delete_qs(self):
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u1 = User.objects.create()
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u2 = User.objects.create()
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self.assertNumQueries(1, User.objects.filter(pk=u1.pk).delete)
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self.assertEqual(User.objects.count(), 1)
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self.assertTrue(User.objects.filter(pk=u2.pk).exists())
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def test_fast_delete_joined_qs(self):
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a = Avatar.objects.create(desc='a')
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User.objects.create(avatar=a)
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u2 = User.objects.create()
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expected_queries = 1 if connection.features.update_can_self_select else 2
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self.assertNumQueries(expected_queries,
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User.objects.filter(avatar__desc='a').delete)
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self.assertEqual(User.objects.count(), 1)
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self.assertTrue(User.objects.filter(pk=u2.pk).exists())
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def test_fast_delete_inheritance(self):
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c = Child.objects.create()
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p = Parent.objects.create()
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# 1 for self, 1 for parent
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# However, this doesn't work as child.parent access creates a query,
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# and this means we will be generating extra queries (a lot for large
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# querysets). This is not a fast-delete problem.
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# self.assertNumQueries(2, c.delete)
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c.delete()
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self.assertFalse(Child.objects.exists())
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self.assertEqual(Parent.objects.count(), 1)
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self.assertEqual(Parent.objects.filter(pk=p.pk).count(), 1)
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# 1 for self delete, 1 for fast delete of empty "child" qs.
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self.assertNumQueries(2, p.delete)
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self.assertFalse(Parent.objects.exists())
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# 1 for self delete, 1 for fast delete of empty "child" qs.
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c = Child.objects.create()
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p = c.parent_ptr
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self.assertNumQueries(2, p.delete)
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self.assertFalse(Parent.objects.exists())
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self.assertFalse(Child.objects.exists())
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