magic-removal: Removed subclassing model unit tests for now
git-svn-id: http://code.djangoproject.com/svn/django/branches/magic-removal@1645 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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Adrian Holovaty
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ebcc0dad23
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"""
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15. Subclassing models
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You can subclass another model to create a copy of it that behaves slightly
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differently.
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"""
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from django.db import models
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# From the "Bare-bones model" example
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from modeltests.basic.models import Article
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# From the "Adding __repr__()" example
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from modeltests.repr.models import Article as ArticleWithRepr
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# From the "Specifying ordering" example
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from modeltests.ordering.models import Article as ArticleWithOrdering
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# This uses all fields and metadata from Article and
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# adds a "section" field.
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class ArticleWithSection(Article):
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section = models.CharField(maxlength=30)
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# This uses all fields and metadata from Article but
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# removes the "pub_date" field.
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class ArticleWithoutPubDate(Article):
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class META:
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remove_fields = ('pub_date',)
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# This uses all fields and metadata from Article but
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# overrides the "pub_date" field.
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class ArticleWithFieldOverride(Article):
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pub_date = models.DateField() # overrides the old field, a DateTimeField
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# No need to add remove_fields = ('pub_date',)
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# This uses all fields and metadata from ArticleWithRepr and
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# makes a few additions/changes.
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class ArticleWithManyChanges(ArticleWithRepr):
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section = models.CharField(maxlength=30)
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is_popular = models.BooleanField()
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pub_date = models.DateField() # overrides the old field, a DateTimeField
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# This uses all fields from ArticleWithOrdering but
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# changes the ordering parameter.
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class ArticleWithChangedMeta(ArticleWithOrdering):
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class META:
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ordering = ('headline', 'pub_date')
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class NoModuleNameFirst(Article):
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section = models.CharField(maxlength=30)
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class NoModuleNameSecond(Article):
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section = models.CharField(maxlength=30)
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API_TESTS = """
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# No data is in the system yet.
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>>> ArticleWithSection.objects.get_list()
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[]
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>>> ArticleWithoutPubDate.objects.get_list()
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[]
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>>> ArticleWithFieldOverride.objects.get_list()
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[]
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# Create an ArticleWithSection.
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>>> from datetime import date, datetime
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>>> a1 = ArticleWithSection(headline='First', pub_date=datetime(2005, 8, 22), section='News')
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>>> a1.save()
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>>> a1
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<ArticleWithSection object>
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>>> a1.id
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1
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>>> a1.headline
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'First'
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>>> a1.pub_date
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datetime.datetime(2005, 8, 22, 0, 0)
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# Retrieve it again, to prove the fields have been saved.
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>>> a1 = ArticleWithSection.objects.get_object(pk=1)
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>>> a1.headline
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'First'
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>>> a1.pub_date
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datetime.datetime(2005, 8, 22, 0, 0)
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>>> a1.section
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'News'
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# Create an ArticleWithoutPubDate.
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>>> a2 = ArticleWithoutPubDate(headline='Second')
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>>> a2.save()
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>>> a2
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<ArticleWithoutPubDate object>
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>>> a2.id
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1
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>>> a2.pub_date
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Traceback (most recent call last):
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...
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AttributeError: 'ArticleWithoutPubDate' object has no attribute 'pub_date'
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# Retrieve it again, to prove the fields have been saved.
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>>> a2 = ArticleWithoutPubDate.objects.get_object(pk=1)
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>>> a2.headline
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'Second'
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>>> a2.pub_date
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Traceback (most recent call last):
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...
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AttributeError: 'ArticleWithoutPubDate' object has no attribute 'pub_date'
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# Create an ArticleWithFieldOverride.
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>>> a3 = ArticleWithFieldOverride(headline='Third', pub_date=date(2005, 8, 22))
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>>> a3.save()
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>>> a3
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<ArticleWithFieldOverride object>
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>>> a3.id
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1
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>>> a3.pub_date
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datetime.date(2005, 8, 22)
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# Retrieve it again, to prove the fields have been saved.
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>>> a3 = ArticleWithFieldOverride.objects.get_object(pk=1)
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>>> a3.headline
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'Third'
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>>> a3.pub_date
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datetime.date(2005, 8, 22)
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# Create an ArticleWithManyChanges.
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>>> a4 = ArticleWithManyChanges(headline='Fourth', section='Arts',
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... is_popular=True, pub_date=date(2005, 8, 22))
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>>> a4.save()
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# a4 inherits __repr__() from its parent model (ArticleWithRepr).
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>>> a4
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Fourth
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# Retrieve it again, to prove the fields have been saved.
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>>> a4 = ArticleWithManyChanges.objects.get_object(pk=1)
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>>> a4.headline
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'Fourth'
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>>> a4.section
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'Arts'
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>>> a4.is_popular == True
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True
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>>> a4.pub_date
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datetime.date(2005, 8, 22)
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# Test get_list().
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>>> ArticleWithSection.objects.get_list()
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[<ArticleWithSection object>]
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>>> ArticleWithoutPubDate.objects.get_list()
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[<ArticleWithoutPubDate object>]
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>>> ArticleWithFieldOverride.objects.get_list()
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[<ArticleWithFieldOverride object>]
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>>> ArticleWithManyChanges.objects.get_list()
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[Fourth]
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# Create a couple of ArticleWithChangedMeta objects.
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>>> a5 = ArticleWithChangedMeta(headline='A', pub_date=datetime(2005, 3, 1))
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>>> a5.save()
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>>> a6 = ArticleWithChangedMeta(headline='B', pub_date=datetime(2005, 4, 1))
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>>> a6.save()
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>>> a7 = ArticleWithChangedMeta(headline='C', pub_date=datetime(2005, 5, 1))
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>>> a7.save()
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# Ordering has been overridden, so objects are ordered
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# by headline ASC instead of pub_date DESC.
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>>> ArticleWithChangedMeta.objects.get_list()
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[A, B, C]
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>>> NoModuleNameFirst.objects.get_list()
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[]
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>>> NoModuleNameSecond.objects.get_list()
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[]
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"""
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