Make Comments API errors more meaningful

comments-api/app.py

@@ -123,12 +123,16 @@ class VideosResource(flask_restful.Resource):
 class CommentResource(flask_restful.Resource):
     @flask_restful.marshal_with(comment_fields)
     def get(self, video_id, comment_id):
+        q = db.session.query(Video).filter(Video.id == video_id)
+        video = q.first()
+        if not video:
+            flask_restful.abort(404, message='Video {0} does not exist'.format(video_id))
         q = db.session.query(Association).join(Comment).filter(
                 Association.video_id == video_id, Comment.id == comment_id)
         assoc = q.first()
         if not assoc:
             flask_restful.abort(404,
-                message='Video {0} or comment {1} does not exist'.format(video_id, comment_id))
+                message='Comment {0} does not exist'.format(comment_id))
         return assoc, 200
 
 
@@ -136,9 +140,11 @@ class CommentsResource(flask_restful.Resource):
     @flask_restful.marshal_with(comment_fields)
     def get(self, id):
         args = filter_parser.parse_args()
-        q = db.session.query(Association).join(Comment).filter(Association.video_id == id)
-        if q.count() == 0:
+        q = db.session.query(Video).filter(Video.id == id)
+        video = q.first()
+        if not video:
             flask_restful.abort(404, message='Video {0} does not exist'.format(id))
+        q = db.session.query(Association).join(Comment).filter(Association.video_id == id)
         if args['filter']:
             q = q.filter(Comment.message_body.ilike('%{}%'.format(args['filter'])))
         count = q.count()