policies/api: fix PolicyBinding's target being validated against the wrong pks

passbook/lib/api.py

@@ -1,36 +0,0 @@
-"""passbook API Helpers"""
-from django.core.exceptions import ObjectDoesNotExist
-from django.db.models.query import QuerySet
-from model_utils.managers import InheritanceQuerySet
-from rest_framework.serializers import ModelSerializer, PrimaryKeyRelatedField
-
-
-class InheritancePrimaryKeyRelatedField(PrimaryKeyRelatedField):
-    """rest_framework PrimaryKeyRelatedField which resolves
-    model_manager's InheritanceQuerySet"""
-
-    def get_queryset(self) -> QuerySet:
-        queryset = super().get_queryset()
-        if isinstance(queryset, InheritanceQuerySet):
-            return queryset.select_subclasses()
-        return queryset
-
-    def to_internal_value(self, data):
-        if self.pk_field is not None:
-            data = self.pk_field.to_internal_value(data)
-        try:
-            queryset = self.get_queryset()
-            if isinstance(queryset, InheritanceQuerySet):
-                return queryset.get_subclass(pk=data)
-            return queryset.get(pk=data)
-        except ObjectDoesNotExist:
-            self.fail("does_not_exist", pk_value=data)
-        except (TypeError, ValueError):
-            self.fail("incorrect_type", data_type=type(data).__name__)
-
-
-class InheritanceModelSerializer(ModelSerializer):
-    """rest_framework ModelSerializer which automatically uses InheritancePrimaryKeyRelatedField
-    for every primary key"""
-
-    serializer_related_field = InheritancePrimaryKeyRelatedField