Fixed #10399 -- Tested that o2o field updates are not constrained by an inner query.

from __future__ import absolute_import

from __future__ import absolute_import, unicode_literals

from operator import attrgetter

from django.core.exceptions import FieldError

from django.db import connection

from django.test import TestCase

from django.test.testcases import CaptureQueriesContext

from django.utils import six

from .models import (Chef, CommonInfo, ItalianRestaurant, ParkingLot, Place,

        )

        with self.assertNumQueries(6):

            ir.save()

    def test_update_parent_filtering(self):

        """

        Test that updating a field of a model subclass doesn't issue an UPDATE

        query constrained by an inner query.

        Refs #10399

        """

        supplier = Supplier.objects.create(

            name='Central market',

            address='610 some street'

        )

        # Capture the expected query in a database agnostic way

        with CaptureQueriesContext(connection) as captured_queries:

            Place.objects.filter(pk=supplier.pk).update(name=supplier.name)

        expected_sql = captured_queries[0]['sql']

        # Capture the queries executed when a subclassed model instance is saved.

        with CaptureQueriesContext(connection) as captured_queries:

            supplier.save(update_fields=('name',))

        for query in captured_queries:

            sql = query['sql']

            if 'UPDATE' in sql:

                self.assertEqual(expected_sql, sql)