Revert "*: providers and sources -> channels, PolicyModel to PolicyBindingModel that uses custom M2M through"

This reverts commit 7ed3ceb960.

passbook/core/api/sources.py

@@ -0,0 +1,31 @@
+"""Source API Views"""
+from rest_framework.serializers import ModelSerializer, SerializerMethodField
+from rest_framework.viewsets import ReadOnlyModelViewSet
+
+from passbook.admin.forms.source import SOURCE_SERIALIZER_FIELDS
+from passbook.core.models import Source
+
+
+class SourceSerializer(ModelSerializer):
+    """Source Serializer"""
+
+    __type__ = SerializerMethodField(method_name="get_type")
+
+    def get_type(self, obj):
+        """Get object type so that we know which API Endpoint to use to get the full object"""
+        return obj._meta.object_name.lower().replace("source", "")
+
+    class Meta:
+
+        model = Source
+        fields = SOURCE_SERIALIZER_FIELDS + ["__type__"]
+
+
+class SourceViewSet(ReadOnlyModelViewSet):
+    """Source Viewset"""
+
+    queryset = Source.objects.all()
+    serializer_class = SourceSerializer
+
+    def get_queryset(self):
+        return Source.objects.select_subclasses()