Use none? instead of count == 0 thanks to rubocop

Author: trichoplax

app/controllers/comments_controller.rb

@@ -276,7 +276,7 @@ def post
 
   def post_follow
     @post = Post.find(params[:post_id])
-    if ThreadFollower.where(post: @post, user: current_user).count == 0
+    if ThreadFollower.where(post: @post, user: current_user).none?
       ThreadFollower.create(post: @post, user: current_user)
     end
     redirect_to post_path(@post)