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2db4b13480
* Model init no longer performs a database query to refetch the related objects it is passed. * Model init now caches unsaved related objects correctly, too. (Previously, accessing the field would raise `DoesNotExist` error for `null=False` fields.) * Added tests for assigning `None` to `null=True` `ForeignKey` fields (refs #6886). git-svn-id: http://code.djangoproject.com/svn/django/trunk@8185 bcc190cf-cafb-0310-a4f2-bffc1f526a37
123 lines
3.5 KiB
Python
123 lines
3.5 KiB
Python
from django.db import models
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class Place(models.Model):
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name = models.CharField(max_length=50)
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address = models.CharField(max_length=80)
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def __unicode__(self):
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return u"%s the place" % self.name
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class Restaurant(models.Model):
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place = models.OneToOneField(Place)
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serves_hot_dogs = models.BooleanField()
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serves_pizza = models.BooleanField()
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def __unicode__(self):
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return u"%s the restaurant" % self.place.name
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class Bar(models.Model):
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place = models.OneToOneField(Place)
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serves_cocktails = models.BooleanField()
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def __unicode__(self):
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return u"%s the bar" % self.place.name
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class UndergroundBar(models.Model):
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place = models.OneToOneField(Place, null=True)
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serves_cocktails = models.BooleanField()
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class Favorites(models.Model):
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name = models.CharField(max_length = 50)
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restaurants = models.ManyToManyField(Restaurant)
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def __unicode__(self):
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return u"Favorites for %s" % self.name
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__test__ = {'API_TESTS':"""
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# Regression test for #1064 and #1506: Check that we create models via the m2m
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# relation if the remote model has a OneToOneField.
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>>> p1 = Place(name='Demon Dogs', address='944 W. Fullerton')
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>>> p1.save()
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>>> r = Restaurant(place=p1, serves_hot_dogs=True, serves_pizza=False)
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>>> r.save()
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>>> f = Favorites(name = 'Fred')
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>>> f.save()
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>>> f.restaurants = [r]
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>>> f.restaurants.all()
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[<Restaurant: Demon Dogs the restaurant>]
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# Regression test for #7173: Check that the name of the cache for the
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# reverse object is correct.
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>>> b = Bar(place=p1, serves_cocktails=False)
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>>> b.save()
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>>> p1.restaurant
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<Restaurant: Demon Dogs the restaurant>
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>>> p1.bar
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<Bar: Demon Dogs the bar>
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#
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# Regression test for #6886 (the related-object cache)
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#
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# Look up the objects again so that we get "fresh" objects
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>>> p = Place.objects.get(name="Demon Dogs")
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>>> r = p.restaurant
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# Accessing the related object again returns the exactly same object
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>>> p.restaurant is r
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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 p._restaurant_cache
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>>> p.restaurant is r
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False
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# Reassigning the Restaurant object results in an immediate cache update
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# We can't use a new Restaurant because that'll violate one-to-one, but
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# with a new *instance* the is test below will fail if #6886 regresses.
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>>> r2 = Restaurant.objects.get(pk=r.pk)
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>>> p.restaurant = r2
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>>> p.restaurant is r2
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True
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# Assigning None succeeds if field is null=True.
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>>> ug_bar = UndergroundBar.objects.create(place=p, serves_cocktails=False)
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>>> ug_bar.place = None
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>>> ug_bar.place is None
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True
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# Assigning None fails: Place.restaurant is null=False
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>>> p.restaurant = None
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Traceback (most recent call last):
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...
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ValueError: Cannot assign None: "Place.restaurant" 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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>>> p.restaurant = p
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Traceback (most recent call last):
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...
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ValueError: Cannot assign "<Place: Demon Dogs the place>": "Place.restaurant" must be a "Restaurant" instance.
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# Creation using keyword argument should cache the related object.
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>>> p = Place.objects.get(name="Demon Dogs")
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>>> r = Restaurant(place=p)
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>>> r.place is p
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True
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# Creation using keyword argument and unsaved related instance (#8070).
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>>> p = Place()
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>>> r = Restaurant(place=p)
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>>> r.place is p
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True
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# Creation using attname keyword argument and an id will cause the related
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# object to be fetched.
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>>> p = Place.objects.get(name="Demon Dogs")
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>>> r = Restaurant(place_id=p.id)
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>>> r.place is p
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False
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>>> r.place == p
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True
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"""}
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