为什么我在私有方法中返回 false 后我的 Rails 控制器没有停止执行？

Question

当我在以下控制器上运行 ajax POST delete 时，对于已删除的记录，rails 会引发错误“undefined method `destroy' for nil:NilClass”。但为什么当我尝试在 destory 调用之前的 find_follow 方法中呈现响应时，它仍然会这样说？执行不应该在find_follow中停止吗？

class FollowsController < ApplicationController


 def find_follow
   begin
     @follow = current_artist.follows.find(params[:id])
     raise "Record Not Found" if @follow.nil? 
   rescue => e
      respond_to do |format|
        format.html { redirect_to(artist_follows_path(current_artist),:notice => "#{e}") }
        format.js { render :text => "#{e}", :status => :not_found}
        format.json {render :json => "#{e}", :status => 400}
      end
      return false
    end
  end


  def destroy
    find_follow
    if (@follow.destroy)
       # respond_to html, js, json...

    end

  end
end

Answer 1

您的 find_follow 返回 nil ，这很好，但是当您调用 destroy 方法时，您只需要在 destroy 方法中编写 return

尝试

def destroy
    return find_follow

您也可以使用 < code>before_filter 类似以下内容

class FollowsController < ApplicationController
 before_filter :find_follow, :only=>[:destroy]

 def find_follow
     @follow = current_artist.follows.find_by_id(params[:id])
     if @follow.nil? 
        redirect_to(artist_follows_path(current_artist),:notice => "#{e}")
     else
      return true
    end
  end


  def destroy
    if (@follow.destroy)
       # respond_to html, js, json...

    end

  end
end