48 lines
1.1 KiB
Python
48 lines
1.1 KiB
Python
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"""
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Regression tests for defer() / only() behavior.
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"""
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from django.conf import settings
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from django.db import connection, models
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class Item(models.Model):
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name = models.CharField(max_length=10)
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text = models.TextField(default="xyzzy")
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value = models.IntegerField()
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other_value = models.IntegerField(default=0)
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def __unicode__(self):
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return self.name
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__test__ = {"regression_tests": """
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Deferred fields should really be deferred and not accidentally use the field's
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default value just because they aren't passed to __init__.
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>>> settings.DEBUG = True
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>>> _ = Item.objects.create(name="first", value=42)
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>>> obj = Item.objects.only("name", "other_value").get(name="first")
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# Accessing "name" doesn't trigger a new database query. Accessing "value" or
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# "text" should.
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>>> num = len(connection.queries)
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>>> obj.name
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u"first"
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>>> obj.other_value
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0
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>>> len(connection.queries) == num
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True
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>>> obj.value
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42
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>>> len(connection.queries) == num + 1 # Effect of values lookup.
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True
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>>> obj.text
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u"xyzzy"
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>>> len(connection.queries) == num + 2 # Effect of text lookup.
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True
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>>> settings.DEBUG = False
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"""
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}
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