def test_Children_number_add(self):
sch = School(school_name="_name1", classes_number=100)
sch.save()
twz = Classes(class_name="WeizhongTu", children_number=100,schoolkey=sch)
twz.save()
c = Classes.objects.get(pk=1)
old_number = c.children_number
children = Children()
children.Classeskey = c
children.Parents_id = 1
children.nicename = "1"
children.save()
self.assertEqual(children.Classeskey.children_number, 101)
children.delete()
self.assertEqual(children.Classeskey.children_number, 100)
#编辑
children = Children.objects.get(pk=1)
children.Classeskey = c
children.Parents_id = 1
children.nicename = "2"
children.save()
self.assertEqual(children.Classeskey.children_number, 100)
