consuming groups

api/commentables.rb

@@ -16,10 +16,15 @@ get "#{APIPREFIX}/:commentable_id/threads" do |commentable_id|
 end
 
 post "#{APIPREFIX}/:commentable_id/threads" do |commentable_id|
-  thread = CommentThread.new(params.slice(*%w[title body course_id group_id]).merge(commentable_id: commentable_id))
+  thread = CommentThread.new(params.slice(*%w[title body course_id ]).merge(commentable_id: commentable_id))
   thread.anonymous = bool_anonymous || false
   thread.anonymous_to_peers = bool_anonymous_to_peers || false
   thread.tags = params["tags"] || ""
+  
+  if params["group_id"]
+    thread.group_id = params["group_id"]
+  end
+  
   thread.author = user
   thread.save
   if thread.errors.any?