#32323: Lazy object id fetch on object initialization.
-------------------------------------+-------------------------------------
Reporter: | Owner: nobody
Bartłomiej Nowak |
Type: New | Status: new
feature |
Component: Database | Version: 2.2
layer (models, ORM) | Keywords: bulk_create, fetch
Severity: Normal | id, lazy id fetch,
Triage Stage: | can_return_ids_from_bulk_insert
Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Let's assume I am using the Postgres database, so the flag
**can_return_ids_from_bulk_insert** is True.
I would like to do this:
{{{
class ModelA:
pass
class ModelB:
a = models.ForeginKey(ModelA)
a_to_create = []
b_to_create = []
for _ in some_data:
a = ModelA(...)
a_to_create.append(a)
b_to_create.append(
ModelB(a=a, ...)
)
ModelA.objects.bulk_create(a_to_create)
# all objects in the a_to_create list have now ids, becouse of
can_return_ids_from_bulk_insert flag. a_to_create[0].id will return int.
ModelA.objects.bulk_create(b_to_create)
}}}
But when I initialize ModelB(a=a), Django immediately fetches id from
object **a**, which is None in this line, and using this latter, instead
of fetching it (id) from the provided object, when it's going to create.
Why do not fetch this id lazy?
Because of this situation, I have to do an additional loop for every
additional model.
Thank you
--
Ticket URL: <https://code.djangoproject.com/ticket/32323>
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