author | Nishanth Amuluru <nishanth@fossee.in> |
Sun, 09 Jan 2011 00:53:11 +0530 | |
changeset 348 | 1eb24b1662cf |
parent 307 | c6bca38c1cbf |
permissions | -rw-r--r-- |
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1 |
from django.db.models.query_utils import DeferredAttribute |
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from django.test import TestCase |
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from models import Secondary, Primary, Child, BigChild |
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class DeferTests(TestCase): |
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def assert_delayed(self, obj, num): |
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count = 0 |
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for field in obj._meta.fields: |
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if isinstance(obj.__class__.__dict__.get(field.attname), |
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DeferredAttribute): |
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count += 1 |
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self.assertEqual(count, num) |
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def test_defer(self): |
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# To all outward appearances, instances with deferred fields look the |
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# same as normal instances when we examine attribute values. Therefore |
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# we test for the number of deferred fields on returned instances (by |
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# poking at the internals), as a way to observe what is going on. |
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s1 = Secondary.objects.create(first="x1", second="y1") |
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p1 = Primary.objects.create(name="p1", value="xx", related=s1) |
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qs = Primary.objects.all() |
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self.assert_delayed(qs.defer("name")[0], 1) |
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self.assert_delayed(qs.only("name")[0], 2) |
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self.assert_delayed(qs.defer("related__first")[0], 0) |
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obj = qs.select_related().only("related__first")[0] |
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self.assert_delayed(obj, 2) |
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self.assertEqual(obj.related_id, s1.pk) |
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self.assert_delayed(qs.defer("name").extra(select={"a": 1})[0], 1) |
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self.assert_delayed(qs.extra(select={"a": 1}).defer("name")[0], 1) |
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self.assert_delayed(qs.defer("name").defer("value")[0], 2) |
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self.assert_delayed(qs.only("name").only("value")[0], 2) |
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self.assert_delayed(qs.only("name").defer("value")[0], 2) |
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self.assert_delayed(qs.only("name", "value").defer("value")[0], 2) |
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self.assert_delayed(qs.defer("name").only("value")[0], 2) |
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obj = qs.only()[0] |
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self.assert_delayed(qs.defer(None)[0], 0) |
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self.assert_delayed(qs.only("name").defer(None)[0], 0) |
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# User values() won't defer anything (you get the full list of |
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# dictionaries back), but it still works. |
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self.assertEqual(qs.defer("name").values()[0], { |
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"id": p1.id, |
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"name": "p1", |
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"value": "xx", |
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"related_id": s1.id, |
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}) |
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self.assertEqual(qs.only("name").values()[0], { |
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"id": p1.id, |
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"name": "p1", |
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"value": "xx", |
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"related_id": s1.id, |
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}) |
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# Using defer() and only() with get() is also valid. |
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self.assert_delayed(qs.defer("name").get(pk=p1.pk), 1) |
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self.assert_delayed(qs.only("name").get(pk=p1.pk), 2) |
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# DOES THIS WORK? |
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self.assert_delayed(qs.only("name").select_related("related")[0], 1) |
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self.assert_delayed(qs.defer("related").select_related("related")[0], 0) |
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# Saving models with deferred fields is possible (but inefficient, |
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# since every field has to be retrieved first). |
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obj = Primary.objects.defer("value").get(name="p1") |
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obj.name = "a new name" |
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obj.save() |
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self.assertQuerysetEqual( |
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Primary.objects.all(), [ |
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"a new name", |
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], |
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lambda p: p.name |
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) |
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# Regression for #10572 - A subclass with no extra fields can defer |
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# fields from the base class |
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Child.objects.create(name="c1", value="foo", related=s1) |
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# You can defer a field on a baseclass when the subclass has no fields |
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obj = Child.objects.defer("value").get(name="c1") |
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self.assert_delayed(obj, 1) |
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self.assertEqual(obj.name, "c1") |
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self.assertEqual(obj.value, "foo") |
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obj.name = "c2" |
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obj.save() |
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# You can retrive a single column on a base class with no fields |
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obj = Child.objects.only("name").get(name="c2") |
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self.assert_delayed(obj, 3) |
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self.assertEqual(obj.name, "c2") |
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self.assertEqual(obj.value, "foo") |
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obj.name = "cc" |
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obj.save() |
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|
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BigChild.objects.create(name="b1", value="foo", related=s1, other="bar") |
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# You can defer a field on a baseclass |
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obj = BigChild.objects.defer("value").get(name="b1") |
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self.assert_delayed(obj, 1) |
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self.assertEqual(obj.name, "b1") |
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self.assertEqual(obj.value, "foo") |
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self.assertEqual(obj.other, "bar") |
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obj.name = "b2" |
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obj.save() |
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# You can defer a field on a subclass |
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obj = BigChild.objects.defer("other").get(name="b2") |
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114 |
self.assert_delayed(obj, 1) |
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parents:
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|
115 |
self.assertEqual(obj.name, "b2") |
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parents:
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116 |
self.assertEqual(obj.value, "foo") |
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parents:
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|
117 |
self.assertEqual(obj.other, "bar") |
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parents:
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118 |
obj.name = "b3" |
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parents:
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119 |
obj.save() |
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parents:
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120 |
|
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Nishanth Amuluru <nishanth@fossee.in>
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121 |
# You can retrieve a single field on a baseclass |
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parents:
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122 |
obj = BigChild.objects.only("name").get(name="b3") |
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Added buildout stuff and made changes accordingly
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parents:
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changeset
|
123 |
self.assert_delayed(obj, 4) |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
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changeset
|
124 |
self.assertEqual(obj.name, "b3") |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
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changeset
|
125 |
self.assertEqual(obj.value, "foo") |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
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changeset
|
126 |
self.assertEqual(obj.other, "bar") |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
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|
127 |
obj.name = "b4" |
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Nishanth Amuluru <nishanth@fossee.in>
parents:
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|
128 |
obj.save() |
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parents:
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|
129 |
|
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Added buildout stuff and made changes accordingly
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changeset
|
130 |
# You can retrieve a single field on a baseclass |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
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changeset
|
131 |
obj = BigChild.objects.only("other").get(name="b4") |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
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changeset
|
132 |
self.assert_delayed(obj, 4) |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
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changeset
|
133 |
self.assertEqual(obj.name, "b4") |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
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changeset
|
134 |
self.assertEqual(obj.value, "foo") |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
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changeset
|
135 |
self.assertEqual(obj.other, "bar") |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
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changeset
|
136 |
obj.name = "bb" |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
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changeset
|
137 |
obj.save() |