comments_controller.rb

  def create
    @comment = current_user.comments.create!(comment_params)
    @parent = params[:comment][:parent_id]
    PostMailer.commented_post(@comment.post.user_id, current_user).deliver_now unless Post.mine?(@comment.post.id, current_user)
    Rb::PhotoUploadService.upload(current_user.id, self.class, @comment.id, params[:comment][:photo]) if params[:comment][:photo]

    respond_to do |format|
      if @comment.save
        format.html { redirect_back(fallback_location: root_path) }
        format.js
      end
    end
  end