Fixed #10733 -- Added a regression test for queries with multiple references...

(regression for #10710).

>>> c1 = Child.objects.create(name="c1", value=42)

>>> obj = Leaf.objects.create(name="l1", child=c1)

>>> c2 = Child.objects.create(name="c2", value=37)

>>> obj = Leaf.objects.create(name="l1", child=c1, second_child=c2)

>>> obj = Leaf.objects.only("name", "child").select_related()[0]

>>> obj.child.name

>>> c1 is c2 is c3

True

# Regression for #10733 - only() can be used on a model with two foreign keys.

>>> results = Leaf.objects.all().only('name', 'child', 'second_child').select_related()

>>> results[0].child.name

u'c1'

>>> results[0].second_child.name

u'c2'

>>> results = Leaf.objects.all().only('name', 'child', 'second_child', 'child__name', 'second_child__name').select_related()

>>> results[0].child.name

u'c1'

>>> results[0].second_child.name

u'c2'

# Finally, we need to flush the app cache for the defer module.

# Using only/defer creates some artifical entries in the app cache

# that messes up later tests. Purge all entries, just to be sure.

>>> from django.db.models.loading import cache

>>> cache.app_models['defer_regress'] = {}

"""

}