Switch to a resource and service based API from previous app based one.

Signed-off-by: Michael Price <loneviking72@gmail.com>

mayan/apps/document_parsing/api_views.py

@@ -1,9 +1,11 @@
 from __future__ import absolute_import, unicode_literals
 
+from django.shortcuts import get_object_or_404
+
 from rest_framework import generics
 from rest_framework.response import Response
 
-from documents.models import DocumentPage
+from documents.models import Document, DocumentPage
 from rest_api.permissions import MayanPermission
 
 from .models import DocumentPageContent
@@ -14,20 +16,24 @@ from .serializers import DocumentPageContentSerializer
 class APIDocumentPageContentView(generics.RetrieveAPIView):
     """
     Returns the content of the selected document page.
-    ---
-    GET:
-        parameters:
-            - name: pk
-              paramType: path
-              type: number
     """
-
+    lookup_url_kwarg = 'page_pk'
     mayan_object_permissions = {
         'GET': (permission_content_view,),
     }
     permission_classes = (MayanPermission,)
     serializer_class = DocumentPageContentSerializer
-    queryset = DocumentPage.objects.all()
+
+    def get_document(self):
+        return get_object_or_404(Document, pk=self.kwargs['document_pk'])
+
+    def get_document_version(self):
+        return get_object_or_404(
+            self.get_document().versions.all(), pk=self.kwargs['version_pk']
+        )
+
+    def get_queryset(self):
+        return self.get_document_version().pages.all()
 
     def retrieve(self, request, *args, **kwargs):
         instance = self.get_object()