Allow undo votes in comments votes component

app/controllers/comments/votes_controller.rb

@@ -1,7 +1,8 @@
 module Comments
   class VotesController < ApplicationController
-    load_and_authorize_resource :comment
     before_action :authenticate_user!
+    load_and_authorize_resource :comment
+    load_and_authorize_resource through: :comment, through_association: :votes_for, only: :destroy
     before_action :verify_comments_open!
 
     def create
@@ -13,6 +14,14 @@ module Comments
       end
     end
 
+    def destroy
+      @comment.unvote_by(current_user)
+
+      respond_to do |format|
+        format.js { render :show }
+      end
+    end
+
     private
 
       def verify_comments_open!