def test_delete_parent(self):
trekA = TrekFactory(name=u"A")
trekB = TrekFactory(name=u"B")
trekC = TrekFactory(name=u"C")
OrderedTrekChild(parent=trekB, child=trekA, order=1).save()
OrderedTrekChild(parent=trekC, child=trekA, order=2).save()
self.assertTrue(OrderedTrekChild.objects.filter(parent=trekB).exists())
self.assertQuerysetEqual(trekA.parents, ['<Trek: B>', '<Trek: C>'],
ordered=False)
self.assertQuerysetEqual(trekB.children, ['<Trek: A>'])
self.assertQuerysetEqual(trekC.children, ['<Trek: A>'])
self.assertEqual(trekA.parents_id, [trekB.id, trekC.id])
self.assertEqual(list(trekB.children_id), [trekA.id])
self.assertEqual(list(trekC.children_id), [trekA.id])
trekB.delete()
self.assertEqual(trekA.previous_id_for(trekC), None)
self.assertEqual(trekA.next_id_for(trekC), None)
self.assertEqual(trekA.next_id, {trekC.id: None})
self.assertEqual(trekA.previous_id, {trekC.id: None})
self.assertFalse(
OrderedTrekChild.objects.filter(parent=trekB).exists())
self.assertQuerysetEqual(trekA.parents, ['<Trek: C>'])
self.assertQuerysetEqual(trekC.children, ['<Trek: A>'])
self.assertEqual(trekA.parents_id, [trekC.id])
self.assertEqual(list(trekC.children_id), [trekA.id])
def test_next_previous(self):
trekA = TrekFactory(name="A")
trekB = TrekFactory(name="B")
trekC = TrekFactory(name="C")
trekD = TrekFactory(name="D")
OrderedTrekChild(parent=trekC, child=trekA, order=42).save()
OrderedTrekChild(parent=trekC, child=trekB, order=15).save()
OrderedTrekChild(parent=trekD, child=trekA, order=1).save()
self.assertEqual(list(trekA.children_id), [])
self.assertEqual(list(trekB.children_id), [])
self.assertEqual(list(trekC.children_id), [trekB.id, trekA.id])
self.assertEqual(list(trekD.children_id), [trekA.id])
self.assertEqual(trekA.next_id, {trekC.id: None, trekD.id: None})
self.assertEqual(trekB.next_id, {trekC.id: trekA.id})
self.assertEqual(trekC.next_id, {})
self.assertEqual(trekD.next_id, {})
self.assertEqual(trekA.previous_id, {trekC.id: trekB.id, trekD.id: None})
self.assertEqual(trekB.previous_id, {trekC.id: None})
self.assertEqual(trekC.previous_id, {})
self.assertEqual(trekD.previous_id, {})