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This monster of a patch is the result of Alex Gaynor's 2009 Google Summer of Code project. Congratulations to Alex for a job well done. Big thanks also go to: * Justin Bronn for keeping GIS in line with the changes, * Karen Tracey and Jani Tiainen for their help testing Oracle support * Brett Hoerner, Jon Loyens, and Craig Kimmerer for their feedback. * Malcolm Treddinick for his guidance during the GSoC submission process. * Simon Willison for driving the original design process * Cal Henderson for complaining about ponies he wanted. ... and everyone else too numerous to mention that helped to bring this feature into fruition. git-svn-id: http://code.djangoproject.com/svn/django/trunk@11952 bcc190cf-cafb-0310-a4f2-bffc1f526a37
214 lines
9.4 KiB
Python
214 lines
9.4 KiB
Python
import datetime
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import django.utils.copycompat as copy
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from django.contrib.auth.models import User
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from django.db import models
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from django.db.models.query import Q
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from django.utils.datastructures import SortedDict
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class RevisionableModel(models.Model):
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base = models.ForeignKey('self', null=True)
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title = models.CharField(blank=True, max_length=255)
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when = models.DateTimeField(default=datetime.datetime.now)
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def __unicode__(self):
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return u"%s (%s, %s)" % (self.title, self.id, self.base.id)
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def save(self, *args, **kwargs):
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super(RevisionableModel, self).save(*args, **kwargs)
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if not self.base:
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self.base = self
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kwargs.pop('force_insert', None)
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kwargs.pop('force_update', None)
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super(RevisionableModel, self).save(*args, **kwargs)
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def new_revision(self):
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new_revision = copy.copy(self)
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new_revision.pk = None
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return new_revision
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class Order(models.Model):
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created_by = models.ForeignKey(User)
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text = models.TextField()
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class TestObject(models.Model):
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first = models.CharField(max_length=20)
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second = models.CharField(max_length=20)
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third = models.CharField(max_length=20)
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def __unicode__(self):
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return u'TestObject: %s,%s,%s' % (self.first,self.second,self.third)
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__test__ = {"API_TESTS": """
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# Regression tests for #7314 and #7372
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>>> rm = RevisionableModel.objects.create(title='First Revision', when=datetime.datetime(2008, 9, 28, 10, 30, 0))
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>>> rm.pk, rm.base.pk
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(1, 1)
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>>> rm2 = rm.new_revision()
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>>> rm2.title = "Second Revision"
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>>> rm.when = datetime.datetime(2008, 9, 28, 14, 25, 0)
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>>> rm2.save()
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>>> print u"%s of %s" % (rm2.title, rm2.base.title)
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Second Revision of First Revision
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>>> rm2.pk, rm2.base.pk
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(2, 1)
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Queryset to match most recent revision:
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>>> qs = RevisionableModel.objects.extra(where=["%(table)s.id IN (SELECT MAX(rev.id) FROM %(table)s rev GROUP BY rev.base_id)" % {'table': RevisionableModel._meta.db_table,}],)
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>>> qs
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[<RevisionableModel: Second Revision (2, 1)>]
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Queryset to search for string in title:
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>>> qs2 = RevisionableModel.objects.filter(title__contains="Revision")
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>>> qs2
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[<RevisionableModel: First Revision (1, 1)>, <RevisionableModel: Second Revision (2, 1)>]
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Following queryset should return the most recent revision:
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>>> qs & qs2
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[<RevisionableModel: Second Revision (2, 1)>]
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>>> u = User.objects.create_user(username="fred", password="secret", email="fred@example.com")
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# General regression tests: extra select parameters should stay tied to their
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# corresponding select portions. Applies when portions are updated or otherwise
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# moved around.
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>>> qs = User.objects.extra(select=SortedDict((("alpha", "%s"), ("beta", "2"), ("gamma", "%s"))), select_params=(1, 3))
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>>> qs = qs.extra(select={"beta": 4})
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>>> qs = qs.extra(select={"alpha": "%s"}, select_params=[5])
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>>> result = {'alpha': 5, 'beta': 4, 'gamma': 3}
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>>> list(qs.filter(id=u.id).values('alpha', 'beta', 'gamma')) == [result]
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True
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# Regression test for #7957: Combining extra() calls should leave the
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# corresponding parameters associated with the right extra() bit. I.e. internal
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# dictionary must remain sorted.
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>>> User.objects.extra(select={"alpha": "%s"}, select_params=(1,)).extra(select={"beta": "%s"}, select_params=(2,))[0].alpha
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1
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>>> User.objects.extra(select={"beta": "%s"}, select_params=(1,)).extra(select={"alpha": "%s"}, select_params=(2,))[0].alpha
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2
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# Regression test for #7961: When not using a portion of an extra(...) in a
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# query, remove any corresponding parameters from the query as well.
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>>> list(User.objects.extra(select={"alpha": "%s"}, select_params=(-6,)).filter(id=u.id).values_list('id', flat=True)) == [u.id]
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True
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# Regression test for #8063: limiting a query shouldn't discard any extra()
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# bits.
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>>> qs = User.objects.all().extra(where=['id=%s'], params=[u.id])
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>>> qs
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[<User: fred>]
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>>> qs[:1]
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[<User: fred>]
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# Regression test for #8039: Ordering sometimes removed relevant tables from
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# extra(). This test is the critical case: ordering uses a table, but then
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# removes the reference because of an optimisation. The table should still be
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# present because of the extra() call.
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>>> Order.objects.extra(where=["username=%s"], params=["fred"], tables=["auth_user"]).order_by('created_by')
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[]
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# Regression test for #8819: Fields in the extra(select=...) list should be
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# available to extra(order_by=...).
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>>> User.objects.filter(pk=u.id).extra(select={'extra_field': 1}).distinct()
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[<User: fred>]
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>>> User.objects.filter(pk=u.id).extra(select={'extra_field': 1}, order_by=['extra_field'])
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[<User: fred>]
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>>> User.objects.filter(pk=u.id).extra(select={'extra_field': 1}, order_by=['extra_field']).distinct()
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[<User: fred>]
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# When calling the dates() method on a queryset with extra selection columns,
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# we can (and should) ignore those columns. They don't change the result and
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# cause incorrect SQL to be produced otherwise.
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>>> RevisionableModel.objects.extra(select={"the_answer": 'id'}).dates('when', 'month')
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[datetime.datetime(2008, 9, 1, 0, 0)]
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# Regression test for #10256... If there is a values() clause, Extra columns are
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# only returned if they are explicitly mentioned.
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>>> TestObject(first='first', second='second', third='third').save()
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>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values()
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[{'bar': u'second', 'third': u'third', 'second': u'second', 'whiz': u'third', 'foo': u'first', 'id': 1, 'first': u'first'}]
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# Extra clauses after an empty values clause are still included
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>>> TestObject.objects.values().extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third'))))
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[{'bar': u'second', 'third': u'third', 'second': u'second', 'whiz': u'third', 'foo': u'first', 'id': 1, 'first': u'first'}]
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# Extra columns are ignored if not mentioned in the values() clause
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>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values('first', 'second')
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[{'second': u'second', 'first': u'first'}]
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# Extra columns after a non-empty values() clause are ignored
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>>> TestObject.objects.values('first', 'second').extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third'))))
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[{'second': u'second', 'first': u'first'}]
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# Extra columns can be partially returned
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>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values('first', 'second', 'foo')
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[{'second': u'second', 'foo': u'first', 'first': u'first'}]
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# Also works if only extra columns are included
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>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values('foo', 'whiz')
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[{'foo': u'first', 'whiz': u'third'}]
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# Values list works the same way
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# All columns are returned for an empty values_list()
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>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list()
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[(u'first', u'second', u'third', 1, u'first', u'second', u'third')]
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# Extra columns after an empty values_list() are still included
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>>> TestObject.objects.values_list().extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third'))))
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[(u'first', u'second', u'third', 1, u'first', u'second', u'third')]
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# Extra columns ignored completely if not mentioned in values_list()
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>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list('first', 'second')
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[(u'first', u'second')]
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# Extra columns after a non-empty values_list() clause are ignored completely
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>>> TestObject.objects.values_list('first', 'second').extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third'))))
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[(u'first', u'second')]
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>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list('second', flat=True)
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[u'second']
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# Only the extra columns specified in the values_list() are returned
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>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list('first', 'second', 'whiz')
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[(u'first', u'second', u'third')]
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# ...also works if only extra columns are included
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>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list('foo','whiz')
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[(u'first', u'third')]
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>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list('whiz', flat=True)
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[u'third']
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# ... and values are returned in the order they are specified
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>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list('whiz','foo')
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[(u'third', u'first')]
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>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list('first','id')
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[(u'first', 1)]
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>>> TestObject.objects.extra(select=SortedDict((('foo','first'),('bar','second'),('whiz','third')))).values_list('whiz', 'first', 'bar', 'id')
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[(u'third', u'first', u'second', 1)]
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# Regression for #10847: the list of extra columns can always be accurately evaluated.
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# Using an inner query ensures that as_sql() is producing correct output
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# without requiring full evaluation and execution of the inner query.
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>>> TestObject.objects.extra(select={'extra': 1}).values('pk')
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[{'pk': 1}]
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>>> TestObject.objects.filter(pk__in=TestObject.objects.extra(select={'extra': 1}).values('pk'))
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[<TestObject: TestObject: first,second,third>]
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>>> TestObject.objects.values('pk').extra(select={'extra': 1})
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[{'pk': 1}]
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>>> TestObject.objects.filter(pk__in=TestObject.objects.values('pk').extra(select={'extra': 1}))
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[<TestObject: TestObject: first,second,third>]
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"""}
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