controller.rb

def destroy
    @tag = ActsAsTaggableOn::Tag.find_by_name(params[:name])
    @tag_following = current_user.tag_followings.find_by_tag_id( @tag.id )
    if @tag_following && @tag_following.destroy
    logger.debug "The #{@tag} has been deleted"
      @tag_unfollowed = true
    else
      @tag_unfollowed = false
    end

    # if params[:remote]
      respond_to do |format|
        format.js { render 'tags/update' }
        format.any {
          if @tag_unfollowed
            flash[:notice] = I18n.t('tag_followings.destroy.success', :name => params[:name])
          else
            flash[:error] = I18n.t('tag_followings.destroy.failure', :name => params[:name])
          end
          redirect_to tag_path(:name => params[:name])
        }
      end
    # else
    #   if @tag_unfollowed
    #     flash[:notice] = I18n.t('tag_followings.destroy.success', :name => params[:name])
    #   else
    #     flash[:error] = I18n.t('tag_followings.destroy.failure', :name => params[:name])
    #   end
    #   redirect_to tag_path(:name => params[:name])
    # end
  end