Question

我希望未登录的用户能够看到该展示页面。现在，NoMethodError会出现current_user错误。

def show
  @correct_user = current_user.challenges.find_by(id: params[:id])
end

sessions_helper

  # Returns the current logged-in user (if any).
  def current_user
    if (user_id = session[:user_id])
      @current_user ||= User.find_by(id: user_id)
    elsif (user_id = cookies.signed[:user_id])
      user = User.find_by(id: user_id)
      if user && user.authenticated?(:remember, cookies[:remember_token])
        log_in user
        @current_user = user
      end
    end
  end

我使用@correct_user，因为我只想向挑战的创建者展示某些内容：

<% if @correct_user %>
  # show stuff to user who made challenge  
<% else %>
  # show to everyone else, which would mean logged in users and non logged in users 
<% end %>

如何允许未登录的用户查看展示页面，@correct_user内的内容除外？

Answer 1

这个应该有助于检测current_user是否正确。

class UsersController < ApplicationController    
    before_action :set_challenge, only: :show
    before_action :check_user, only: :show

    private 

  def set_ challenge
     @challenge = Challenge.find(params[:id])
  end


    def check_user
      if current_user.id != @challenge.user_id
        redirect_to root_url, alert: "Sorry, You are not allowed to be here, Bye Bye ))"
      end
    end
end

Answer 2

如果.challenges为current_user，则在current_user上致电null将导致您的错误。

def show
  if current_user
    @correct_user = current_user.challenges.find_by(id: params[:id])
  end
end

Answer 3

if current_user
  @correct_user = current_user.challenges.find_by(id: params[:id])
else
  @correct_user = nil
end

Answer 4

很可能current_user返回零，因此挑战方法无法运行并为您提供NoMethodError

correct_user不使用current_user？

4 个答案: