Fix nullable ForeignKey validation (#145)

Author: aminalaee

orm/fields.py

@@ -170,7 +170,7 @@ def target(self):
         return self._target
 
     def get_validator(self, **kwargs) -> typesystem.Field:
-        return self.ForeignKeyValidator()
+        return self.ForeignKeyValidator(**kwargs)
 
     def get_column(self, name: str) -> sqlalchemy.Column:
         target = self.target

tests/test_foreignkey.py

@@ -269,3 +269,12 @@ async def test_one_to_one_crud():
 
     with pytest.raises(exceptions):
         await Person.objects.create(email="[email protected]", profile=profile)
+
+
+async def test_nullable_foreign_key():
+    await Member.objects.create(email="[email protected]")
+
+    member = await Member.objects.get()
+
+    assert member.email == "[email protected]"
+    assert member.team.pk is None