Question

我希望创建帖子和管理员的用户可以删除但是它会给我一个“未定义的错误”。我想知道为什么它会给我一个未定义的方法错误。

这是来自控制器的代码：

行动前：

  before_action :set_recipe, only: [:edit, :update, :show, :like]
  before_action :require_user, except: [:show, :index, :like]
  before_action :require_user_like, only: [:like]
  before_action :require_same_user, only: [:edit, :update]
  before_action :admin_or_authorship, only: :destroy

破坏方法：

  def destroy
    Recipe.find(params[:id]).destroy
    flash[:danger] = "Deleted"
    redirect_to stories_path
  end

 private 

    def recipe_params
      params.require(:recipe).permit(:name, :summary, :description)
    end

    def set_recipe
      @recipe = Recipe.find(params[:id])

    end

    def require_same_user
      if current_user != @recipe.user and !current_user.admin? 
        flash[:danger] = "You can only edit your own recipes"
        redirect_to stories_path
      end
    end

    def require_user_like
      if !logged_in?
        flash[:danger] = "log in to like!"
        redirect_to :back
      end
    end

    def admin_or_authorship
      redirect_to stories_path unless administrator? || authorship?
    end

    def administrator?
      current_user.admin?
    end

    def authorship?
       @recipe.user == current_user
    end

Answer 1

问题在于，您的before_filter admin_or_authorship正在进一步调用authorship?，正在说@recipe.user ...。此处@recipe未定义，默认情况下为nil。

您还需要为set_recipe调用before_filter destroy：

before_action :set_recipe, only: [:edit, :update, :show, :like, :destroy]

您的行动将成为：

  def destroy
    @recipe.destroy
    flash[:danger] = "Deleted"
    redirect_to stories_path
  end

nil的未定义方法`user'：方法销毁时的NilClass

1 个答案: