77 lines
2.1 KiB
Python
77 lines
2.1 KiB
Python
"""
|
|
Regression tests for a few FK bugs: #1578, #6886
|
|
"""
|
|
|
|
from django.db import models
|
|
|
|
# If ticket #1578 ever slips back in, these models will not be able to be
|
|
# created (the field names being lower-cased versions of their opposite
|
|
# classes is important here).
|
|
|
|
class First(models.Model):
|
|
second = models.IntegerField()
|
|
|
|
class Second(models.Model):
|
|
first = models.ForeignKey(First, related_name = 'the_first')
|
|
|
|
# Protect against repetition of #1839, #2415 and #2536.
|
|
class Third(models.Model):
|
|
name = models.CharField(max_length=20)
|
|
third = models.ForeignKey('self', null=True, related_name='child_set')
|
|
|
|
class Parent(models.Model):
|
|
name = models.CharField(max_length=20)
|
|
bestchild = models.ForeignKey('Child', null=True, related_name='favored_by')
|
|
|
|
class Child(models.Model):
|
|
name = models.CharField(max_length=20)
|
|
parent = models.ForeignKey(Parent)
|
|
|
|
|
|
__test__ = {'API_TESTS':"""
|
|
>>> Third.objects.create(id='3', name='An example')
|
|
<Third: Third object>
|
|
>>> parent = Parent(name = 'fred')
|
|
>>> parent.save()
|
|
>>> Child.objects.create(name='bam-bam', parent=parent)
|
|
<Child: Child object>
|
|
|
|
#
|
|
# Tests of ForeignKey assignment and the related-object cache (see #6886)
|
|
#
|
|
>>> p = Parent.objects.create(name="Parent")
|
|
>>> c = Child.objects.create(name="Child", parent=p)
|
|
|
|
# Look up the object again so that we get a "fresh" object
|
|
>>> c = Child.objects.get(name="Child")
|
|
>>> p = c.parent
|
|
|
|
# Accessing the related object again returns the exactly same object
|
|
>>> c.parent is p
|
|
True
|
|
|
|
# But if we kill the cache, we get a new object
|
|
>>> del c._parent_cache
|
|
>>> c.parent is p
|
|
False
|
|
|
|
# Assigning a new object results in that object getting cached immediately
|
|
>>> p2 = Parent.objects.create(name="Parent 2")
|
|
>>> c.parent = p2
|
|
>>> c.parent is p2
|
|
True
|
|
|
|
# Assigning None fails: Child.parent is null=False
|
|
>>> c.parent = None
|
|
Traceback (most recent call last):
|
|
...
|
|
ValueError: Cannot assign None: "Child.parent" does not allow null values.
|
|
|
|
# You also can't assign an object of the wrong type here
|
|
>>> c.parent = First(id=1, second=1)
|
|
Traceback (most recent call last):
|
|
...
|
|
ValueError: Cannot assign "<First: First object>": "Child.parent" must be a "Parent" instance.
|
|
|
|
"""}
|