wrap friend creation in transaction

app/controllers/api_users_controller.rb

@@ -48,21 +48,23 @@ class ApiUsersController < ApplicationController
   end
 
   def friend_request_update
-    @friend_request = FriendRequest.find(params[:id])
-    @friend_request.accepted = params[:accepted]
-    @friend_request.save
+    ActiveRecord::Base.transaction do
+      @friend_request = FriendRequest.find(params[:id])
+      @friend_request.accepted = params[:accepted]
+      @friend_request.save
 
-    # create both records for this friendship
-    if @friend_request.accepted?
-      @friendship = Friendship.new()
-      @friendship.user_id = @friend_request.user_id
-      @friendship.friend_id = @friend_request.friend_id
-      @friendship.save
+      # create both records for this friendship
+      if @friend_request.accepted?     
+        @friendship = Friendship.new()
+        @friendship.user_id = @friend_request.user_id
+        @friendship.friend_id = @friend_request.friend_id
+        @friendship.save
 
-      @friendship = Friendship.new()
-      @friendship.user_id = @friend_request.friend_id
-      @friendship.friend_id = @friend_request.user_id
-      @friendship.save
+        @friendship = Friendship.new()
+        @friendship.user_id = @friend_request.friend_id
+        @friendship.friend_id = @friend_request.user_id
+        @friendship.save
+      end
     end
 
     respond_with @friend_request, responder: ApiResponder