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Refs #18586 -- Split up tests.defer.DeferTests.test_defer

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Will Earp 2014-12-23 21:11:55 +00:00 committed by Tim Graham
parent 8a9b0c15a6
commit 8952757698
1 changed files with 117 additions and 69 deletions
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186
tests/defer/tests.py
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@ -6,155 +6,203 @@ from django.test import TestCase
from .models import Secondary, Primary, Child, BigChild, ChildProxy, RefreshPrimaryProxy
class DeferTests(TestCase):
class AssertionMixin(object):
def assert_delayed(self, obj, num):
"""
Instances with deferred fields look the same as normal instances when
we examine attribute values. Therefore, this method returns the number
of deferred fields on returned instances.
"""
count = 0
for field in obj._meta.fields:
if isinstance(obj.__class__.__dict__.get(field.attname),
DeferredAttribute):
if isinstance(obj.__class__.__dict__.get(field.attname), DeferredAttribute):
count += 1
self.assertEqual(count, num)
class DeferTests(AssertionMixin, TestCase):
@classmethod
def setUpTestData(cls):
cls.s1 = Secondary.objects.create(first="x1", second="y1")
cls.p1 = Primary.objects.create(name="p1", value="xx", related=cls.s1)
def test_defer(self):
# To all outward appearances, instances with deferred fields look the
# same as normal instances when we examine attribute values. Therefore
# we test for the number of deferred fields on returned instances (by
# poking at the internals), as a way to observe what is going on.
s1 = Secondary.objects.create(first="x1", second="y1")
p1 = Primary.objects.create(name="p1", value="xx", related=s1)
qs = Primary.objects.all()
self.assert_delayed(qs.defer("name")[0], 1)
self.assert_delayed(qs.only("name")[0], 2)
self.assert_delayed(qs.defer("name").get(pk=self.p1.pk), 1)
self.assert_delayed(qs.defer("related__first")[0], 0)
self.assert_delayed(qs.defer("name").defer("value")[0], 2)
def test_only(self):
qs = Primary.objects.all()
self.assert_delayed(qs.only("name")[0], 2)
self.assert_delayed(qs.only("name").get(pk=self.p1.pk), 2)
self.assert_delayed(qs.only("name").only("value")[0], 2)
self.assert_delayed(qs.only("related__first")[0], 2)
# Using 'pk' with only() should result in 3 deferred fields, namely all
# of them except the model's primary key see #15494
self.assert_delayed(qs.only("pk")[0], 3)
obj = qs.select_related().only("related__first")[0]
self.assert_delayed(obj, 2)
self.assertEqual(obj.related_id, s1.pk)
# You can use 'pk' with reverse foreign key lookups.
self.assert_delayed(s1.primary_set.all().only('pk')[0], 3)
self.assert_delayed(self.s1.primary_set.all().only('pk')[0], 3)
self.assert_delayed(qs.defer("name").extra(select={"a": 1})[0], 1)
self.assert_delayed(qs.extra(select={"a": 1}).defer("name")[0], 1)
self.assert_delayed(qs.defer("name").defer("value")[0], 2)
self.assert_delayed(qs.only("name").only("value")[0], 2)
self.assert_delayed(qs.only("name").defer("value")[0], 2)
self.assert_delayed(qs.only("name", "value").defer("value")[0], 2)
def test_defer_only_chaining(self):
qs = Primary.objects.all()
self.assert_delayed(qs.only("name", "value").defer("name")[0], 2)
self.assert_delayed(qs.defer("name").only("value", "name")[0], 2)
self.assert_delayed(qs.defer("name").only("value")[0], 2)
self.assert_delayed(qs.only("name").defer("value")[0], 2)
obj = qs.only()[0]
def test_defer_on_an_already_deferred_field(self):
qs = Primary.objects.all()
self.assert_delayed(qs.defer("name")[0], 1)
self.assert_delayed(qs.defer("name").defer("name")[0], 1)
def test_defer_none_to_clear_deferred_set(self):
qs = Primary.objects.all()
self.assert_delayed(qs.defer("name", "value")[0], 2)
self.assert_delayed(qs.defer(None)[0], 0)
self.assert_delayed(qs.only("name").defer(None)[0], 0)
def test_only_none_raises_error(self):
msg = 'Cannot pass None as an argument to only().'
with self.assertRaisesMessage(TypeError, msg):
Primary.objects.only(None)
def test_defer_extra(self):
qs = Primary.objects.all()
self.assert_delayed(qs.defer("name").extra(select={"a": 1})[0], 1)
self.assert_delayed(qs.extra(select={"a": 1}).defer("name")[0], 1)
def test_defer_values_does_not_defer(self):
# User values() won't defer anything (you get the full list of
# dictionaries back), but it still works.
self.assertEqual(qs.defer("name").values()[0], {
"id": p1.id,
self.assertEqual(Primary.objects.defer("name").values()[0], {
"id": self.p1.id,
"name": "p1",
"value": "xx",
"related_id": s1.id,
})
self.assertEqual(qs.only("name").values()[0], {
"id": p1.id,
"name": "p1",
"value": "xx",
"related_id": s1.id,
"related_id": self.s1.id,
})
def test_only_values_does_not_defer(self):
self.assertEqual(Primary.objects.only("name").values()[0], {
"id": self.p1.id,
"name": "p1",
"value": "xx",
"related_id": self.s1.id,
})
def test_get(self):
# Using defer() and only() with get() is also valid.
self.assert_delayed(qs.defer("name").get(pk=p1.pk), 1)
self.assert_delayed(qs.only("name").get(pk=p1.pk), 2)
qs = Primary.objects.all()
self.assert_delayed(qs.defer("name").get(pk=self.p1.pk), 1)
self.assert_delayed(qs.only("name").get(pk=self.p1.pk), 2)
def test_defer_with_select_related(self):
obj = Primary.objects.select_related().defer("related__first", "related__second")[0]
self.assert_delayed(obj.related, 2)
self.assert_delayed(obj, 0)
def test_only_with_select_related(self):
obj = Primary.objects.select_related().only("related__first")[0]
self.assert_delayed(obj, 2)
self.assert_delayed(obj.related, 1)
self.assertEqual(obj.related_id, self.s1.pk)
self.assertEqual(obj.name, "p1")
def test_defer_selected_related_raises_invalid_query(self):
# When we defer a field and also select_related it, the query is
# invalid and raises an exception.
with self.assertRaises(InvalidQuery):
qs.only("name").select_related("related")[0]
with self.assertRaises(InvalidQuery):
qs.defer("related").select_related("related")[0]
Primary.objects.defer("related").select_related("related")[0]
def test_only_selected_related_raises_invalid_query(self):
with self.assertRaises(InvalidQuery):
Primary.objects.only("name").select_related("related")[0]
def test_defer_foreign_keys_are_deferred_and_not_traversed(self):
# With a depth-based select_related, all deferred ForeignKeys are
# deferred instead of traversed.
with self.assertNumQueries(3):
obj = qs.defer("related").select_related()[0]
obj = Primary.objects.defer("related").select_related()[0]
self.assert_delayed(obj, 1)
self.assertEqual(obj.related.id, s1.pk)
self.assertEqual(obj.related.id, self.s1.pk)
def test_saving_object_with_deferred_field(self):
# Saving models with deferred fields is possible (but inefficient,
# since every field has to be retrieved first).
obj = Primary.objects.defer("value").get(name="p1")
Primary.objects.create(name="p2", value="xy", related=self.s1)
obj = Primary.objects.defer("value").get(name="p2")
obj.name = "a new name"
obj.save()
self.assertQuerysetEqual(
Primary.objects.all(), [
"a new name",
"p1", "a new name",
],
lambda p: p.name
lambda p: p.name,
ordered=False,
)
def test_defer_baseclass_when_subclass_has_no_added_fields(self):
# Regression for #10572 - A subclass with no extra fields can defer
# fields from the base class
Child.objects.create(name="c1", value="foo", related=s1)
Child.objects.create(name="c1", value="foo", related=self.s1)
# You can defer a field on a baseclass when the subclass has no fields
obj = Child.objects.defer("value").get(name="c1")
self.assert_delayed(obj, 1)
self.assertEqual(obj.name, "c1")
self.assertEqual(obj.value, "foo")
obj.name = "c2"
obj.save()
def test_only_baseclass_when_subclass_has_no_added_fields(self):
# You can retrieve a single column on a base class with no fields
obj = Child.objects.only("name").get(name="c2")
Child.objects.create(name="c1", value="foo", related=self.s1)
obj = Child.objects.only("name").get(name="c1")
# on an inherited model, its PK is also fetched, hence '3' deferred fields.
self.assert_delayed(obj, 3)
self.assertEqual(obj.name, "c2")
self.assertEqual(obj.name, "c1")
self.assertEqual(obj.value, "foo")
obj.name = "cc"
obj.save()
BigChild.objects.create(name="b1", value="foo", related=s1, other="bar")
class BigChildDeferTests(AssertionMixin, TestCase):
@classmethod
def setUpTestData(cls):
cls.s1 = Secondary.objects.create(first="x1", second="y1")
BigChild.objects.create(name="b1", value="foo", related=cls.s1, other="bar")
def test_defer_baseclass_when_subclass_has_added_field(self):
# You can defer a field on a baseclass
obj = BigChild.objects.defer("value").get(name="b1")
self.assert_delayed(obj, 1)
self.assertEqual(obj.name, "b1")
self.assertEqual(obj.value, "foo")
self.assertEqual(obj.other, "bar")
obj.name = "b2"
obj.save()
def test_defer_subclass(self):
# You can defer a field on a subclass
obj = BigChild.objects.defer("other").get(name="b2")
obj = BigChild.objects.defer("other").get(name="b1")
self.assert_delayed(obj, 1)
self.assertEqual(obj.name, "b2")
self.assertEqual(obj.name, "b1")
self.assertEqual(obj.value, "foo")
self.assertEqual(obj.other, "bar")
obj.name = "b3"
obj.save()
def test_only_baseclass_when_subclass_has_added_field(self):
# You can retrieve a single field on a baseclass
obj = BigChild.objects.only("name").get(name="b3")
obj = BigChild.objects.only("name").get(name="b1")
# when inherited model, its PK is also fetched, hence '4' deferred fields.
self.assert_delayed(obj, 4)
self.assertEqual(obj.name, "b3")
self.assertEqual(obj.name, "b1")
self.assertEqual(obj.value, "foo")
self.assertEqual(obj.other, "bar")
obj.name = "b4"
obj.save()
# You can retrieve a single field on a baseclass
obj = BigChild.objects.only("other").get(name="b4")
def test_only_sublcass(self):
# You can retrieve a single field on a subclass
obj = BigChild.objects.only("other").get(name="b1")
self.assert_delayed(obj, 4)
self.assertEqual(obj.name, "b4")
self.assertEqual(obj.name, "b1")
self.assertEqual(obj.value, "foo")
self.assertEqual(obj.other, "bar")
obj.name = "bb"
obj.save()
class TestDefer2(AssertionMixin, TestCase):
def test_defer_proxy(self):
"""
Ensure select_related together with only on a proxy model behaves