83 lines
2.9 KiB
Python
83 lines
2.9 KiB
Python
import 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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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):
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super(RevisionableModel, self).save()
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if not self.base:
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self.base = self
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super(RevisionableModel, self).save()
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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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__test__ = {"API_TESTS": """
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# Regression tests for #7314 and #7372
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>>> rm = RevisionableModel.objects.create(title='First Revision')
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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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>>> 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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"""}
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