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git-svn-id: http://code.djangoproject.com/svn/django/trunk@10928 bcc190cf-cafb-0310-a4f2-bffc1f526a37
126 lines
3.6 KiB
Python
126 lines
3.6 KiB
Python
"""
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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.contrib.contenttypes.models import ContentType
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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=15)
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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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class RelatedItem(models.Model):
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item = models.ForeignKey(Item)
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class Child(models.Model):
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name = models.CharField(max_length=10)
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value = models.IntegerField()
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class Leaf(models.Model):
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name = models.CharField(max_length=10)
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child = models.ForeignKey(Child)
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second_child = models.ForeignKey(Child, related_name="other", null=True)
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value = models.IntegerField(default=42)
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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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>>> obj.text
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u"xyzzy"
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>>> len(connection.queries) == num + 2
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True
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>>> settings.DEBUG = False
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Regression test for #10695. Make sure different instances don't inadvertently
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share data in the deferred descriptor objects.
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>>> i = Item.objects.create(name="no I'm first", value=37)
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>>> items = Item.objects.only('value').order_by('-value')
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>>> items[0].name
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u'first'
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>>> items[1].name
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u"no I'm first"
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>>> _ = RelatedItem.objects.create(item=i)
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>>> r = RelatedItem.objects.defer('item').get()
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>>> r.item_id == i.id
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True
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>>> r.item == i
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True
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Some further checks for select_related() and inherited model behaviour
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(regression for #10710).
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>>> c1 = Child.objects.create(name="c1", value=42)
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>>> c2 = Child.objects.create(name="c2", value=37)
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>>> obj = Leaf.objects.create(name="l1", child=c1, second_child=c2)
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>>> obj = Leaf.objects.only("name", "child").select_related()[0]
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>>> obj.child.name
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u'c1'
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>>> Leaf.objects.select_related().only("child__name", "second_child__name")
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[<Leaf_Deferred_name_value: l1>]
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Models instances with deferred fields should still return the same content
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types as their non-deferred versions (bug #10738).
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>>> ctype = ContentType.objects.get_for_model
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>>> c1 = ctype(Item.objects.all()[0])
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>>> c2 = ctype(Item.objects.defer("name")[0])
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>>> c3 = ctype(Item.objects.only("name")[0])
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>>> c1 is c2 is c3
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True
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# Regression for #10733 - only() can be used on a model with two foreign keys.
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>>> results = Leaf.objects.all().only('name', 'child', 'second_child').select_related()
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>>> results[0].child.name
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u'c1'
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>>> results[0].second_child.name
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u'c2'
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>>> results = Leaf.objects.all().only('name', 'child', 'second_child', 'child__name', 'second_child__name').select_related()
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>>> results[0].child.name
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u'c1'
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>>> results[0].second_child.name
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u'c2'
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# Finally, we need to flush the app cache for the defer module.
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# Using only/defer creates some artifical entries in the app cache
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# that messes up later tests. Purge all entries, just to be sure.
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>>> from django.db.models.loading import cache
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>>> cache.app_models['defer_regress'] = {}
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"""
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}
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