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119 lines
4.2 KiB
Python
119 lines
4.2 KiB
Python
from __future__ import absolute_import, unicode_literals
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from django.test import TestCase
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from .models import A, B, C, D, DataPoint, RelatedPoint
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class SimpleTest(TestCase):
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def setUp(self):
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self.a1 = A.objects.create()
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self.a2 = A.objects.create()
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for x in range(20):
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B.objects.create(a=self.a1)
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D.objects.create(a=self.a1)
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def test_nonempty_update(self):
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"""
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Test that update changes the right number of rows for a nonempty queryset
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"""
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num_updated = self.a1.b_set.update(y=100)
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self.assertEqual(num_updated, 20)
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cnt = B.objects.filter(y=100).count()
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self.assertEqual(cnt, 20)
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def test_empty_update(self):
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"""
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Test that update changes the right number of rows for an empty queryset
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"""
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num_updated = self.a2.b_set.update(y=100)
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self.assertEqual(num_updated, 0)
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cnt = B.objects.filter(y=100).count()
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self.assertEqual(cnt, 0)
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def test_nonempty_update_with_inheritance(self):
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"""
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Test that update changes the right number of rows for an empty queryset
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when the update affects only a base table
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"""
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num_updated = self.a1.d_set.update(y=100)
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self.assertEqual(num_updated, 20)
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cnt = D.objects.filter(y=100).count()
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self.assertEqual(cnt, 20)
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def test_empty_update_with_inheritance(self):
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"""
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Test that update changes the right number of rows for an empty queryset
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when the update affects only a base table
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"""
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num_updated = self.a2.d_set.update(y=100)
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self.assertEqual(num_updated, 0)
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cnt = D.objects.filter(y=100).count()
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self.assertEqual(cnt, 0)
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class AdvancedTests(TestCase):
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def setUp(self):
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self.d0 = DataPoint.objects.create(name="d0", value="apple")
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self.d2 = DataPoint.objects.create(name="d2", value="banana")
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self.d3 = DataPoint.objects.create(name="d3", value="banana")
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self.r1 = RelatedPoint.objects.create(name="r1", data=self.d3)
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def test_update(self):
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"""
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Objects are updated by first filtering the candidates into a queryset
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and then calling the update() method. It executes immediately and
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returns nothing.
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"""
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resp = DataPoint.objects.filter(value="apple").update(name="d1")
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self.assertEqual(resp, 1)
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resp = DataPoint.objects.filter(value="apple")
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self.assertEqual(list(resp), [self.d0])
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def test_update_multiple_objects(self):
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"""
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We can update multiple objects at once.
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"""
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resp = DataPoint.objects.filter(value="banana").update(
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value="pineapple")
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self.assertEqual(resp, 2)
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self.assertEqual(DataPoint.objects.get(name="d2").value, 'pineapple')
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def test_update_fk(self):
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"""
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Foreign key fields can also be updated, although you can only update
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the object referred to, not anything inside the related object.
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"""
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resp = RelatedPoint.objects.filter(name="r1").update(data=self.d0)
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self.assertEqual(resp, 1)
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resp = RelatedPoint.objects.filter(data__name="d0")
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self.assertEqual(list(resp), [self.r1])
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def test_update_multiple_fields(self):
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"""
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Multiple fields can be updated at once
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"""
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resp = DataPoint.objects.filter(value="apple").update(
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value="fruit", another_value="peach")
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self.assertEqual(resp, 1)
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d = DataPoint.objects.get(name="d0")
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self.assertEqual(d.value, 'fruit')
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self.assertEqual(d.another_value, 'peach')
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def test_update_all(self):
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"""
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In the rare case you want to update every instance of a model, update()
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is also a manager method.
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"""
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self.assertEqual(DataPoint.objects.update(value='thing'), 3)
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resp = DataPoint.objects.values('value').distinct()
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self.assertEqual(list(resp), [{'value': 'thing'}])
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def test_update_slice_fail(self):
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"""
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We do not support update on already sliced query sets.
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"""
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method = DataPoint.objects.all()[:2].update
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self.assertRaises(AssertionError, method,
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another_value='another thing')
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