Modernize MOTD app

Update API code to use viewsets. Update links and URLs to use
keyword arguments.

Signed-off-by: Roberto Rosario <Roberto.Rosario@mayan-edms.com>

mayan/apps/motd/api_views.py

@@ -1,6 +1,6 @@
 from __future__ import absolute_import, unicode_literals
 
-from rest_framework import generics
+from rest_framework import viewsets
 
 from mayan.apps.rest_api.filters import MayanObjectPermissionsFilter
 from mayan.apps.rest_api.permissions import MayanPermission
@@ -13,32 +13,34 @@ from .permissions import (
 from .serializers import MessageSerializer
 
 
-class APIMessageListView(generics.ListCreateAPIView):
+class APIMessageViewSet(viewsets.ModelViewSet):
     """
-    get: Returns a list of all the messages.
-    post: Create a new message.
+    create:
+    Create a new message.
+
+    delete:
+    Delete the given message.
+
+    edit:
+    Edit the given message.
+
+    list:
+    Return a list of all the messages.
+
+    retrieve:
+    Return the given message details.
     """
     filter_backends = (MayanObjectPermissionsFilter,)
-    mayan_object_permissions = {'GET': (permission_message_view,)}
-    mayan_view_permissions = {'POST': (permission_message_create,)}
-    permission_classes = (MayanPermission,)
-    queryset = Message.objects.all()
-    serializer_class = MessageSerializer
-
-
-class APIMessageView(generics.RetrieveUpdateDestroyAPIView):
-    """
-    delete: Delete the selected message.
-    get: Return the details of the selected message.
-    patch: Edit the selected message.
-    put: Edit the selected message.
-    """
-    filter_backends = (MayanObjectPermissionsFilter,)
-    mayan_object_permissions = {
-        'DELETE': (permission_message_delete,),
-        'GET': (permission_message_view,),
-        'PATCH': (permission_message_edit,),
-        'PUT': (permission_message_edit,)
+    lookup_url_kwarg = 'message_id'
+    object_permission = {
+        'DELETE': permission_message_delete,
+        'GET': permission_message_view,
+        'PATCH': permission_message_edit,
+        'PUT': permission_message_edit,
     }
     queryset = Message.objects.all()
+    permission_classes = (MayanPermission,)
     serializer_class = MessageSerializer
+    view_permission = {
+        'POST': permission_message_create
+    }