Question

我已经完成了Michael Hartl Ruby on Rails 5教程，现在我正在尝试将代码应用到我自己的应用程序中。

我要做的是：

关注/取消关注活动
显示此活动后的用户总数
用户可以查看他们所关注的所有活动

当我尝试呈现当前用户正在关注的会议时，会出现当前错误。

我得到的错误是：

ActionController::UrlGenerationError in Users#show
No route matches {:action=>"followers", :controller=>"conferences", :id=>nil} missing required keys: [:id]

导致问题的一行是：

  <a href="<%= followers_conference_path(@conference) %>">

现在很明显他们的路由有问题我认为以下问题表明会议缺少必需的ID？

有谁知道我的问题的解决方案？哪个允许用户关注事件并查看他们正在关注的事件

用户控制器显示

  def show
    @user = User.find(params[:id])
    @microposts = @user.microposts.paginate(page: params[:page])
    @managments = @user.managments.paginate(page: params[:page])
    @conference = Conference.find(params[:id])
  end

的routes.rb

Rails.application.routes.draw do

  root   'static_pages#home'

  get    '/help',    to: 'static_pages#help'
  get    '/about',   to: 'static_pages#about'
  get    '/contact', to: 'static_pages#contact'

  get    '/my_conference', to: 'my_conference#show'
  get    '/conferences', to: 'conferences#index'
  get    '/conferences_list', to: 'conferences#index_admin'

  get    '/my_employees', to: 'employees#index'

  get    '/signup',  to: 'users#new'

  get    '/login',   to: 'sessions#new'
  post   '/login',   to: 'sessions#create'
  delete '/logout',  to: 'sessions#destroy'

  get    '/login',   to: 'sessions#new'

  put 'activate/:id(.:format)', :to => 'users#activate', :as => :activate_user
  put 'deactivate/:id(.:format)', :to => 'users#deactivate', :as => :deactivate_user

  put 'activate_employee/:id(.:format)', :to => 'employees#activate', :as => :activate_employee
  put 'deactivate_employee/:id(.:format)', :to => 'employees#deactivate', :as => :deactivate_employee

  resources :users do
    member do
      get :following
    end
  end
  resources :conferences do
    member do
      get :followers
    end
  end
  resources :articles
  resources :users
  resources :employees
  resources :account_activations, only: [:edit]
  resources :activations, only: [:edit]
  resources :password_resets,     only: [:new, :create, :edit, :update]
  resources :microposts,          only: [:create, :destroy]
  resources :managments  
  resources :conferences  
  resources :relationships,       only: [:create, :destroy]


end

CONFERENCES_CONTROLLER.RB

class ConferencesController < ApplicationController
  before_action :logged_in_user, only: [:create, :destroy]
  before_action :correct_user,   only: :destroy
  before_action :admin_user,     only: :destroy

    def index

      @conferences = Conference.paginate(page: params[:page])

      if params[:search]
        @conferences = Conference.search(params[:search]).order("created_at DESC").paginate(page: params[:page])
      else
        @conferences = Conference.all.order('created_at DESC').paginate(page: params[:page])
      end
    end

  def new
    @user = User.new
    @conference = Conference.new
  end

  def create

    @conference = current_user.conferences.build(conference_params)
    if @conference.save
      flash[:success] = "conference created!"
      redirect_to conferences_path
    else
      @feed_items = current_user.feed.paginate(page: params[:page])
      render 'new'
    end
  end

  def destroy
    @conference.destroy
    flash[:success] = "conference deleted"
    redirect_to request.referrer || root_url
  end

  def following
    @title = "Following"
    @conference  = Conference.find(params[:id])
    @conferences = @conference.following.paginate(page: params[:page])
    render 'show_follow'
  end

  def followers
    @title = "Followers"
    @user  = User.find(params[:id])
    @users = @user.followers.paginate(page: params[:page])
    render 'show_follow'
  end


  private

    def conference_params
      params.require(:conference).permit(:conference,:country , :month, :presence, :audience, :cost ,:picture)
    end

    # Confirms an admin user.
    def admin_user
      redirect_to(root_url) unless current_user.admin?
    end

    def correct_user
      @conference = current_user.conferences.find_by(id: params[:id])
      redirect_to root_url if @conference.nil?
    end

end

Answer 1

啊，我看到了这个问题。

检查您的UsersController#show，看看是否在任何地方设置@conference。

如果没有尝试：<a href="<%= followers_conference_path(current_user.id) %>">

Answer 2

我不想使用用户ID来获取@conference对象，我确定。相反，您可能正在生成用户正在关注的会议列表。在这种情况下，您可以使用类似这样的内容

<% @user.conferences.each do |conference| %>
  <a href="<%= followers_conference_path(conference) %>"><%= conference.name %></a>
<% end %>

而且，在Rails中，您通常会使用link_to帮助程序，并且可能包含一个计数来显示会议中有多少关注者。

<% @user.conferences.each do |conference| %>
  <%= link_to conference.name, followers_conference_path(conference) %>
  (<%= pluralize conference.users.count, 'follower' %>)
<% end %>

关注和取消关注事件

2 个答案: