diff --git a/tests/regressiontests/many_to_one_regress/models.py b/tests/regressiontests/many_to_one_regress/models.py index d491f002c2..53348a753d 100644 --- a/tests/regressiontests/many_to_one_regress/models.py +++ b/tests/regressiontests/many_to_one_regress/models.py @@ -44,133 +44,3 @@ class Relation(models.Model): def __unicode__(self): return u"%s - %s" % (self.left.category.name, self.right.category.name) - - -__test__ = {'API_TESTS':""" ->>> Third.objects.create(id='3', name='An example') - ->>> parent = Parent(name = 'fred') ->>> parent.save() ->>> Child.objects.create(name='bam-bam', parent=parent) - - -# -# Tests of ForeignKey assignment and the related-object cache (see #6886). -# ->>> p = Parent.objects.create(name="Parent") ->>> c = Child.objects.create(name="Child", parent=p) - -# Look up the object again so that we get a "fresh" object. ->>> c = Child.objects.get(name="Child") ->>> p = c.parent - -# Accessing the related object again returns the exactly same object. ->>> c.parent is p -True - -# But if we kill the cache, we get a new object. ->>> del c._parent_cache ->>> c.parent is p -False - -# Assigning a new object results in that object getting cached immediately. ->>> p2 = Parent.objects.create(name="Parent 2") ->>> c.parent = p2 ->>> c.parent is p2 -True - -# Assigning None succeeds if field is null=True. ->>> p.bestchild = None ->>> p.bestchild is None -True - -# bestchild should still be None after saving. ->>> p.save() ->>> p.bestchild is None -True - -# bestchild should still be None after fetching the object again. ->>> p = Parent.objects.get(name="Parent") ->>> p.bestchild is None -True - -# Assigning None fails: Child.parent is null=False. ->>> c.parent = None -Traceback (most recent call last): - ... -ValueError: Cannot assign None: "Child.parent" does not allow null values. - -# You also can't assign an object of the wrong type here ->>> c.parent = First(id=1, second=1) -Traceback (most recent call last): - ... -ValueError: Cannot assign "": "Child.parent" must be a "Parent" instance. - -# Nor can you explicitly assign None to Child.parent during object creation -# (regression for #9649). ->>> Child(name='xyzzy', parent=None) -Traceback (most recent call last): - ... -ValueError: Cannot assign None: "Child.parent" does not allow null values. ->>> Child.objects.create(name='xyzzy', parent=None) -Traceback (most recent call last): - ... -ValueError: Cannot assign None: "Child.parent" does not allow null values. - -# Creation using keyword argument should cache the related object. ->>> p = Parent.objects.get(name="Parent") ->>> c = Child(parent=p) ->>> c.parent is p -True - -# Creation using keyword argument and unsaved related instance (#8070). ->>> p = Parent() ->>> c = Child(parent=p) ->>> c.parent is p -True - -# Creation using attname keyword argument and an id will cause the related -# object to be fetched. ->>> p = Parent.objects.get(name="Parent") ->>> c = Child(parent_id=p.id) ->>> c.parent is p -False ->>> c.parent == p -True - - -# -# Test of multiple ForeignKeys to the same model (bug #7125). -# ->>> c1 = Category.objects.create(name='First') ->>> c2 = Category.objects.create(name='Second') ->>> c3 = Category.objects.create(name='Third') ->>> r1 = Record.objects.create(category=c1) ->>> r2 = Record.objects.create(category=c1) ->>> r3 = Record.objects.create(category=c2) ->>> r4 = Record.objects.create(category=c2) ->>> r5 = Record.objects.create(category=c3) ->>> r = Relation.objects.create(left=r1, right=r2) ->>> r = Relation.objects.create(left=r3, right=r4) ->>> r = Relation.objects.create(left=r1, right=r3) ->>> r = Relation.objects.create(left=r5, right=r2) ->>> r = Relation.objects.create(left=r3, right=r2) - ->>> Relation.objects.filter(left__category__name__in=['First'], right__category__name__in=['Second']) -[] - ->>> Category.objects.filter(record__left_set__right__category__name='Second').order_by('name') -[, ] - ->>> c2 = Child.objects.create(name="Grandchild", parent=c) -Traceback (most recent call last): - ... -ValueError: Cannot assign "": "Child.parent" must be a "Parent" instance. - -# Regression for #12190 -- Should be able to instantiate a FK -# outside of a model, and interrogate its related field. ->>> cat = models.ForeignKey(Category) ->>> cat.rel.get_related_field().name -'id' - -"""} diff --git a/tests/regressiontests/many_to_one_regress/tests.py b/tests/regressiontests/many_to_one_regress/tests.py new file mode 100644 index 0000000000..7d2a49cea5 --- /dev/null +++ b/tests/regressiontests/many_to_one_regress/tests.py @@ -0,0 +1,105 @@ +from django.db import models +from django.test import TestCase + +from models import First, Second, Third, Parent, Child, Category, Record, Relation + +class ManyToOneRegressionTests(TestCase): + def test_object_creation(self): + Third.objects.create(id='3', name='An example') + parent = Parent(name='fred') + parent.save() + Child.objects.create(name='bam-bam', parent=parent) + + def test_fk_assignment_and_related_object_cache(self): + # Tests of ForeignKey assignment and the related-object cache (see #6886). + + p = Parent.objects.create(name="Parent") + c = Child.objects.create(name="Child", parent=p) + + # Look up the object again so that we get a "fresh" object. + c = Child.objects.get(name="Child") + p = c.parent + + # Accessing the related object again returns the exactly same object. + self.assertTrue(c.parent is p) + + # But if we kill the cache, we get a new object. + del c._parent_cache + self.assertFalse(c.parent is p) + + # Assigning a new object results in that object getting cached immediately. + p2 = Parent.objects.create(name="Parent 2") + c.parent = p2 + self.assertTrue(c.parent is p2) + + # Assigning None succeeds if field is null=True. + p.bestchild = None + self.assertTrue(p.bestchild is None) + + # bestchild should still be None after saving. + p.save() + self.assertTrue(p.bestchild is None) + + # bestchild should still be None after fetching the object again. + p = Parent.objects.get(name="Parent") + self.assertTrue(p.bestchild is None) + + # Assigning None fails: Child.parent is null=False. + self.assertRaises(ValueError, setattr, c, "parent", None) + + # You also can't assign an object of the wrong type here + self.assertRaises(ValueError, setattr, c, "parent", First(id=1, second=1)) + + # Nor can you explicitly assign None to Child.parent during object + # creation (regression for #9649). + self.assertRaises(ValueError, Child, name='xyzzy', parent=None) + self.assertRaises(ValueError, Child.objects.create, name='xyzzy', parent=None) + + # Creation using keyword argument should cache the related object. + p = Parent.objects.get(name="Parent") + c = Child(parent=p) + self.assertTrue(c.parent is p) + + # Creation using keyword argument and unsaved related instance (#8070). + p = Parent() + c = Child(parent=p) + self.assertTrue(c.parent is p) + + # Creation using attname keyword argument and an id will cause the + # related object to be fetched. + p = Parent.objects.get(name="Parent") + c = Child(parent_id=p.id) + self.assertFalse(c.parent is p) + self.assertEqual(c.parent, p) + + def test_multiple_foreignkeys(self): + # Test of multiple ForeignKeys to the same model (bug #7125). + c1 = Category.objects.create(name='First') + c2 = Category.objects.create(name='Second') + c3 = Category.objects.create(name='Third') + r1 = Record.objects.create(category=c1) + r2 = Record.objects.create(category=c1) + r3 = Record.objects.create(category=c2) + r4 = Record.objects.create(category=c2) + r5 = Record.objects.create(category=c3) + r = Relation.objects.create(left=r1, right=r2) + r = Relation.objects.create(left=r3, right=r4) + r = Relation.objects.create(left=r1, right=r3) + r = Relation.objects.create(left=r5, right=r2) + r = Relation.objects.create(left=r3, right=r2) + + q1 = Relation.objects.filter(left__category__name__in=['First'], right__category__name__in=['Second']) + self.assertQuerysetEqual(q1, [""]) + + q2 = Category.objects.filter(record__left_set__right__category__name='Second').order_by('name') + self.assertQuerysetEqual(q2, ["", ""]) + + p = Parent.objects.create(name="Parent") + c = Child.objects.create(name="Child", parent=p) + self.assertRaises(ValueError, Child.objects.create, name="Grandchild", parent=c) + + def test_fk_instantiation_outside_model(self): + # Regression for #12190 -- Should be able to instantiate a FK outside + # of a model, and interrogate its related field. + cat = models.ForeignKey(Category) + self.assertEqual('id', cat.rel.get_related_field().name)