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