def test_dangling_foreign_keys(self):
heston_blumenthal = Chef.objects.create(name="Heston Blumenthal")
snail_ice_cream = Dish.objects.create(name="Snail ice cream")
chateauneuf = Wine.objects.create(name="Chateauneuf-du-Pape 1979")
fat_duck = Restaurant(name="The Fat Duck", proprietor=heston_blumenthal, serves_hot_dogs=False, menu_items=[
MenuItem(dish=snail_ice_cream, price='20.00', recommended_wine=chateauneuf)
])
fat_duck_json = fat_duck.to_json()
fat_duck = Restaurant.from_json(fat_duck_json)
self.assertEqual("Heston Blumenthal", fat_duck.proprietor.name)
self.assertEqual("Chateauneuf-du-Pape 1979", fat_duck.menu_items.all()[0].recommended_wine.name)
heston_blumenthal.delete()
fat_duck = Restaurant.from_json(fat_duck_json)
# the deserialised record should recognise that the heston_blumenthal record is now missing
self.assertEqual(None, fat_duck.proprietor)
self.assertEqual("Chateauneuf-du-Pape 1979", fat_duck.menu_items.all()[0].recommended_wine.name)
chateauneuf.delete() # oh dear, looks like we just drank the last bottle
fat_duck = Restaurant.from_json(fat_duck_json)
# the deserialised record should now have a null recommended_wine field
self.assertEqual(None, fat_duck.menu_items.all()[0].recommended_wine)
snail_ice_cream.delete() # NOM NOM NOM
fat_duck = Restaurant.from_json(fat_duck_json)
# the menu item should now be dropped entirely (because the foreign key to Dish has on_delete=CASCADE)
self.assertEqual(0, fat_duck.menu_items.count())
def test_dangling_foreign_keys(self):
heston_blumenthal = Chef.objects.create(name="Heston Blumenthal")
snail_ice_cream = Dish.objects.create(name="Snail ice cream")
chateauneuf = Wine.objects.create(name="Chateauneuf-du-Pape 1979")
fat_duck = Restaurant(name="The Fat Duck", proprietor=heston_blumenthal, serves_hot_dogs=False, menu_items=[
MenuItem(dish=snail_ice_cream, price='20.00', recommended_wine=chateauneuf)
])
fat_duck_json = fat_duck.to_json()
fat_duck = Restaurant.from_json(fat_duck_json)
self.assertEqual("Heston Blumenthal", fat_duck.proprietor.name)
self.assertEqual("Chateauneuf-du-Pape 1979", fat_duck.menu_items.all()[0].recommended_wine.name)
heston_blumenthal.delete()
fat_duck = Restaurant.from_json(fat_duck_json)
# the deserialised record should recognise that the heston_blumenthal record is now missing
self.assertEqual(None, fat_duck.proprietor)
self.assertEqual("Chateauneuf-du-Pape 1979", fat_duck.menu_items.all()[0].recommended_wine.name)
chateauneuf.delete() # oh dear, looks like we just drank the last bottle
fat_duck = Restaurant.from_json(fat_duck_json)
# the deserialised record should now have a null recommended_wine field
self.assertEqual(None, fat_duck.menu_items.all()[0].recommended_wine)
snail_ice_cream.delete() # NOM NOM NOM
fat_duck = Restaurant.from_json(fat_duck_json)
# the menu item should now be dropped entirely (because the foreign key to Dish has on_delete=CASCADE)
self.assertEqual(0, fat_duck.menu_items.count())
def test_serialize_with_multi_table_inheritance(self):
fat_duck = Restaurant(name='The Fat Duck', serves_hot_dogs=False, reviews=[
Review(author='Michael Winner', body='Rubbish.')
])
data = json.loads(fat_duck.to_json())
self.assertEqual(data['name'], 'The Fat Duck')
self.assertEqual(data['serves_hot_dogs'], False)
self.assertEqual(data['reviews'][0]['author'], 'Michael Winner')
def test_serialize_with_multi_table_inheritance(self):
fat_duck = Restaurant(name='The Fat Duck', serves_hot_dogs=False, reviews=[
Review(author='Michael Winner', body='Rubbish.')
])
data = json.loads(fat_duck.to_json())
self.assertEqual(data['name'], 'The Fat Duck')
self.assertEqual(data['serves_hot_dogs'], False)
self.assertEqual(data['reviews'][0]['author'], 'Michael Winner')
