#27408: Make QuerySet.bulk_create() populate fields on related models
-------------------------------------+-------------------------------------
Reporter: Jarek Glowacki | Owner: nobody
Type: New feature | Status: new
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution:
Keywords: bulk_create foreign | Triage Stage:
key id | Someday/Maybe
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by David Grant):
My solution to this problem is the following:
{{{
class BulkHelperMixin:
def bulk_create(self, objs, batch_size=None, ignore_conflicts=False):
foreign_key_fields = [field for field in
objs[0]._meta.get_fields() if type(field) == ForeignKey]
for obj in objs:
for foreign_key_field in foreign_key_fields:
parent_obj = getattr(obj, foreign_key_field.name)
if parent_obj and getattr(obj, foreign_key_field.column)
is None:
setattr(obj, foreign_key_field.name, parent_obj)
return super().bulk_create(objs, batch_size=batch_size,
ignore_conflicts=ignore_conflicts)
class BulkHelperManager(BulkHelperMixin, models.Manager):
pass
}}}
Then in my model I do something like:
{{{
objects = models.Manager()
bulk_manager = BulkHelperManager()
}}}
and then I just do bulk_create using my bulk_manager starting from the
parent going down to the children. It works beautifully!
--
Ticket URL: <https://code.djangoproject.com/ticket/27408#comment:7>
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