爲什麼在我私有方法返回false後，我的rails控制器不會停止執行？

Question

當我在我的跟隨控制器上運行ajax POST delete時，對於已經被刪除的記錄，rails會在「nil：NilClass」引發錯誤「未定義方法destroy」。但爲什麼它仍然會說，當我嘗試在destory調用之前的find_follow方法中呈現響應時？執行不應該停止在find_follow裏面嗎？

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

你find_follow返回nil這是好的，但因爲你調用destroy方法，你需要寫在destroy方法只返回

嘗試

def destroy 
    return find_follow 

您還可以使用before_filter類似以下

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