id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
32323	Lazy object id fetch on object initialization.	Bartłomiej Nowak	nobody	"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 "	Bug	closed	Database layer (models, ORM)	2.2	Normal	duplicate	bulk_create, fetch id, lazy id fetch, can_return_ids_from_bulk_insert		Unreviewed	0	0	0	0	0	0