support for models.Model.objects, abstract mixins

test/test-data/check-model-relations.test

@@ -55,4 +55,17 @@ class Profile(models.Model):
 
 profile = Profile()
 reveal_type(profile.user_id)  # E: Revealed type is 'builtins.int'
-[out]
+[out]
+
+[case testToParameterKeywordMaybeAbsent]
+from django.db import models
+
+class User(models.Model):
+    pass
+
+class Profile(models.Model):
+    user = models.OneToOneField(User, on_delete=models.CASCADE, related_name='profile')
+
+reveal_type(User().profile)  # E: Revealed type is 'main.Profile'
+[out]
+