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1452d46240
* Raise a ValueError if you try to assign the wrong type of object. * Raise a ValueError if you try to assign None to a field not specified with null=True. * Cache the set value at set time instead of just at lookup time. This is a slightly backwards-incompatible change; see BackwardsIncompatibleChanges for more details. git-svn-id: http://code.djangoproject.com/svn/django/trunk@7574 bcc190cf-cafb-0310-a4f2-bffc1f526a37
77 lines
2.1 KiB
Python
77 lines
2.1 KiB
Python
"""
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Regression tests for a few FK bugs: #1578, #6886
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"""
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from django.db import models
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# If ticket #1578 ever slips back in, these models will not be able to be
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# created (the field names being lower-cased versions of their opposite
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# classes is important here).
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class First(models.Model):
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second = models.IntegerField()
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class Second(models.Model):
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first = models.ForeignKey(First, related_name = 'the_first')
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# Protect against repetition of #1839, #2415 and #2536.
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class Third(models.Model):
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name = models.CharField(max_length=20)
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third = models.ForeignKey('self', null=True, related_name='child_set')
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class Parent(models.Model):
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name = models.CharField(max_length=20)
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bestchild = models.ForeignKey('Child', null=True, related_name='favored_by')
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class Child(models.Model):
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name = models.CharField(max_length=20)
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parent = models.ForeignKey(Parent)
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__test__ = {'API_TESTS':"""
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>>> Third.objects.create(id='3', name='An example')
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<Third: Third object>
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>>> parent = Parent(name = 'fred')
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>>> parent.save()
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>>> Child.objects.create(name='bam-bam', parent=parent)
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<Child: Child object>
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#
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# Tests of ForeignKey assignment and the related-object cache (see #6886)
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#
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>>> p = Parent.objects.create(name="Parent")
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>>> c = Child.objects.create(name="Child", parent=p)
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# Look up the object again so that we get a "fresh" object
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>>> c = Child.objects.get(name="Child")
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>>> p = c.parent
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# Accessing the related object again returns the exactly same object
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>>> c.parent is p
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True
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# But if we kill the cache, we get a new object
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>>> del c._parent_cache
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>>> c.parent is p
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False
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# Assigning a new object results in that object getting cached immediately
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>>> p2 = Parent.objects.create(name="Parent 2")
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>>> c.parent = p2
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>>> c.parent is p2
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True
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# Assigning None fails: Child.parent is null=False
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>>> c.parent = None
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Traceback (most recent call last):
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...
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ValueError: Cannot assign None: "Child.parent" does not allow null values.
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# You also can't assign an object of the wrong type here
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>>> c.parent = First(id=1, second=1)
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Traceback (most recent call last):
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...
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ValueError: Cannot assign "<First: First object>": "Child.parent" must be a "Parent" instance.
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"""}
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