[Django] #31762: Dabase creation backend should use base_manager to serialize database

[Django]

#31762: Dabase creation backend should use base_manager to serialize database
-----------------------------------------+------------------------
               Reporter:  Eugene K       |          Owner:  nobody
                   Type:  Uncategorized  |         Status:  new
              Component:  Uncategorized  |        Version:  3.0
               Severity:  Normal         |       Keywords:
           Triage Stage:  Unreviewed     |      Has patch:  0
    Needs documentation:  0              |    Needs tests:  0
Patch needs improvement:  0              |  Easy pickings:  0
                  UI/UX:  0              |
-----------------------------------------+------------------------
 models.py
 {{{
 class Service(Model):
     objects = CustomManagerThatFillterOutSomeRecords()

 class CustomManagerThatFillterOutSomeRecords(Manager):
     def get_queryset(self):
         return super().get_queryset().exclude(pk=1)
 }}}


 tests.py
 {{{
 class TestService(TransactionTestCase):
     serialized_rollback = True

     def test_something(self):
         pass
 }}}

 Assume we have a migration that creates few records of Service.

 {{{
 from django.core.management import call_command
 from django.db import migrations


 def load_fixtures(*_, **__):
     call_command('loaddata', 'services.json')


 class Migration(migrations.Migration):
     dependencies = []

     operations = [
         migrations.RunPython(
             load_fixtures,
             migrations.RunPython.noop,
         )
     ]

 }}}

 Then `TestService` will fail as `serialize_db_to_string` by default use
 `_default_manager` that is `CustomManagerThatFillterOutSomeRecords`.

 Here is proposed fix: https://github.com/django/django/pull/13150

-- 
Ticket URL: <https://code.djangoproject.com/ticket/31762>
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