Merge pull request #11 from rll/feature/kevin/edit_commentable_id

Feature/kevin/edit commentable

api/comment_threads.rb

@@ -14,11 +14,12 @@ get "#{APIPREFIX}/threads/:thread_id" do |thread_id|
 end
 
 put "#{APIPREFIX}/threads/:thread_id" do |thread_id|
-  thread.update_attributes(params.slice(*%w[title body closed]))
+  thread.update_attributes(params.slice(*%w[title body closed commentable_id]))
   if params["tags"]
     thread.tags = params["tags"]
     thread.save
   end
+  
   if thread.errors.any?
     error 400, thread.errors.full_messages.to_json
   else

spec/api/comment_thread_spec.rb

@@ -57,11 +57,12 @@ describe "app" do
     describe "PUT /api/v1/threads/:thread_id" do
       it "update information of comment thread" do
         thread = CommentThread.first
-        put "/api/v1/threads/#{thread.id}", body: "new body", title: "new title"
+        put "/api/v1/threads/#{thread.id}", body: "new body", title: "new title", commentable_id: "new_commentable_id"
         last_response.should be_ok
         changed_thread = CommentThread.find(thread.id)
         changed_thread.body.should == "new body"
         changed_thread.title.should == "new title"
+        changed_thread.commentable_id.should == "new commentable_id"
       end
       it "returns 400 when the thread does not exist" do
         put "/api/v1/threads/does_not_exist", body: "new body", title: "new title"