I have a model UserSite. Every User could have multiple sites. I now have to make them unique. So a site can't be added to a user if it already is appointed to that user. My Model code is:
class UserSite(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE, related_name="sites")
site = models.ForeignKey(Site, on_delete=models.CASCADE, related_name="users")
class Meta:
unique_together = ("user", "site")
All fine. Now I want to make a test class who tests if this works. My test class:
from rest_framework.test import APITestCase
from models import UserSite
from factories import SiteFactory
from factories import UserFactory
class TestUniqueUserSite(APITestCase):
def setUp(self):
self.user = UserFactory()
self.test_site = SiteFactory()
self.test_site_2 = SiteFactory()
self.user_site = UserSite.objects.create(user=self.user, site=self.test_site)
def test_user_site_is_unique(self):
"""
Check if a new UserSite is unique
"""
self.user_site1 = UserSite.objects.create(user=self.user, site=self.test_site)
Factory:
class UserSiteFactory(factory.django.DjangoModelFactory):
class Meta:
model = UserSite
# Type hinting
def __new__(cls, *args, **kwargs) -> "UserSiteFactory.Meta.model":
return super().__new__(*args, **kwargs) # pragma: no cover
site = factory.SubFactory(SiteFactory)
user = factory.SubFactory(UserFactory)
user_role = factory.fuzzy.FuzzyChoice(UserSite.USER_ROLE_CHOICES)
This test gives no errors, the UserSite can be created. What do I wrong? The testing or the unique field? or both hehe, thanks!
When I run:
UserSite.objects.filter(user=self.user, site=self.test_site).all()
I got:
<QuerySet [<UserSite: pk: 1 - user_pk: 1 - site_pk: 1>, <UserSite: pk: 2 - user_pk: 1 - site_pk: 1>]>
So they are stored..
我的猜测是 unique_constraint 应该是一个列表,而不是一个元组。
You are not setting the constraint correctly, it should be like
class UserSite(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE, related_name="sites")
site = models.ForeignKey(Site, on_delete=models.CASCADE, related_name="users")
class Meta:
unique_together = (("user", "site"),)
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