Hi all,
I have problem with foreign key contraint upon calling delete() on my
model. Here's my problem:
I have Order and Shipment model. Shipment has a foreign key to Order.
class Order(...):
...
class Shipment()
order = m.ForeignKey('Order')
...
Now in one of my views I want do delete order object along with all
related objects. So I invoke order.delete().
I have Django 1.0.4, PostgreSQL 8.4 and I use transaction middleware,
so whole request is enclosed in single transaction.
The problem is that upon order.delete() I get:
...
File "/usr/local/lib/python2.6/dist-packages/django/db/backends/
__init__.py", line 28, in _commit
return self.connection.commit()
IntegrityError: update or delete on table "main_order" violates
foreign key constraint "main_shipment_order_id_fkey" on table
"main_shipment"
DETAIL: Key (id)=(45) is still referenced from table "main_shipment".
I checked in connection.queries that proper queries are executed in
proper order.
First shipment is deleted, after that django executes delete on order
row:
{'time': '0.000', 'sql': 'DELETE FROM "main_shipment" WHERE "id" IN
(17)'},
{'time': '0.000', 'sql': 'DELETE FROM "main_order" WHERE "id" IN
(45)'}
Foreign key have ON DELETE NO ACTION (default) and is initially
deferred. I don't know why I get foreign key constraint violation.
I also tried to register pre_delete signal and manually delete
shipment objects before delete on order is called, but it
resulted in the same error. I can change ON DELETE behaviour for this
key in Postgres but it would be just a hack,
I wonder if anyone has a better idea what's going on here.
There is also a small detail, my Order model inherits from Cart model,
so it actually doesn't have id field but cart_ptr_id
and after DELETE on order is executed there is also DELETE on cart,
but it seems unrelated? to the shipment->order
problem so I simplified it in the example.
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