为旅程共享应用程序实现正确的模型 - Rails

Question

我有一个Rails应用程序，有RoR教程中的两种模型：用户模型和Micropost模型。 我实现了整个Twitter应用程序，开始使用Rails。

现在我想要使用我要创建的乘车份额应用程序的代码：人们张贴他们打算乘坐的汽车（当他们开车时），申请乘坐时想要成为乘客，跟随用户获取他们的游乐设施（而不是简单的帖子）并被其他用户关注。我们看到，“用户”实际上扮演着两个角色：驾驶员和乘客。我对司机很好：这只是邮件的作者，没有改变。 但是不是乘客......

我想要什么：在每个驾驶位置上都有一个“跳入”按钮 - 用户单击，按钮变为“跳出”，并且我们有一个在db中创建的记录，在PassengerRide表中（ride_id，passenger_id）//当我们点击“Jump off”时，按钮变成“跳入”，并且已经保存的记录从PassengerRide表中被删除。

我做了什么：我试图模仿下面的执行和适应我想要什么

1）产生的PassengerRide表（很多到用户和微柱之间有许多关系） 与

rails generate model PassengerRide ride_id:integer passenger_id:integer 

2）在passenger_ride.rb：

attr_accessible :ride_id 

编辑：我删除了这个希望它会解决这个问题，并没有解决问题。

3）建立了关联！ （记住：我只有一个用户表和表微柱）的user.rb

has_many :passenger_rides, foreign_key: "passenger_id", dependent: :destroy 
    has_many :rides, through: :passenger_rides, class_name: "Micropost" 

在passenger_ride.rb

belongs_to :passenger, class_name: "User" 
    belongs_to :ride, class_name: "Micropost" 

在micropost.rb

has_many :passenger_rides, foreign_key: "ride_id", dependent: :destroy 
    has_many :passengers, through: :passenger_rides, source: :passenger, class_name: "User" 

4）方法在用户模型中创建passenger_ride记录

def hopped_in?(ride) 
     self.passenger_rides.find_by_ride_id(ride.id) 
    end 

    def hop_in!(ride) 
     self.passenger_rides.create!(ride_id: ride.id) 
    end 

    def jump_off!(ride) 
    self.passenger_rides.find_by_ride_id(ride.id).destroy 
    end 

5）添加乘坐到用户控制器

在routes.rb中

resource :users do 
     member do 
      get :rides 
     end 
    end 

6）的观点

： 在app /视图/微柱/ _hopin.html.erb

<%= form_for(current_user.rides.build(ride_id: @micropost.id)) do |f| %> 
     <div><%= f.hidden_field :ride_id %></div> 
     <%= f.submit "Hop in", :class => "btn btn-large btn-primary" %> 
    <% end %> 

in app/views/microposts/_jumpoff.html.erb

<%= form_for(current_user.rides.find_by_ride_id(@micropost), 
     html: { method: :delete }) do |f| %> 
    <%= f.submit "Jump off", :class => "btn btn-large" %> 
    <% end %> 

在app/views/microposts/_ride_form.html中。ERB

 <div id="ride_form"> 
     <% if current_user.hopped_in?(@micropost) %> 
       <%= render 'microposts/jumpoff' %> 
     <% else %> 
       <%= render 'microposts/hopin' %> 
     <% end %> 
     </div> 

本地服务器呈现如下：

Started GET "/" for 127.0.0.1 at 2012-03-30 21:39:06 -0400 
    Processing by PagesController#home as HTML 
    ←[1m←[36mUser Load (0.0ms)←[0m ←[1mSELECT "users".* FROM "users" WHERE "users 
    "."remember_token" = 'R8o1mYu49bhrsrIyIPO-ow' LIMIT 1←[0m 
    ←[1m←[35m (0.0ms)←[0m SELECT DISTINCT "users".id FROM "users" INNER JOIN "rel 
    ationships" ON "users"."id" = "relationships"."followed_id" WHERE "relationships 
    "."follower_id" = 3 
    ←[1m←[36m (1.0ms)←[0m ←[1mSELECT COUNT(*) FROM "microposts" WHERE "microposts 
    "."user_id" = 3←[0m 
    Rendered shared/_user_info.html.erb (4.0ms) 
    ←[1m←[35m (0.0ms)←[0m SELECT COUNT(*) FROM "users" INNER JOIN "relationships" 
    ON "users"."id" = "relationships"."followed_id" WHERE "relationships"."follower 
    _id" = 3 
    ←[1m←[36m (0.0ms)←[0m ←[1mSELECT COUNT(*) FROM "users" INNER JOIN "relationsh 
    ips" ON "users"."id" = "relationships"."follower_id" WHERE "relationships"."foll 
    owed_id" = 3←[0m 
    ←[1m←[35m (0.0ms)←[0m SELECT COUNT(*) FROM "microposts" INNER JOIN "passenger 
    _rides" ON "microposts"."id" = "passenger_rides"."ride_id" WHERE "passenger_ride 
    s"."passenger_id" = 3 
    Rendered shared/_stats.html.erb (15.0ms) 
    ←[1m←[36m (0.0ms)←[0m ←[1mSELECT COUNT(*) FROM "microposts" WHERE (user_id IN 
    (1) OR user_id = 3)←[0m 
    ←[1m←[35mMicropost Load (0.0ms)←[0m SELECT "microposts".* FROM "microposts" W 
    HERE (user_id IN (1) OR user_id = 3) ORDER BY microposts.created_at DESC LIMIT 3 
    0 OFFSET 0 
    ←[1m←[36mUser Load (0.0ms)←[0m ←[1mSELECT "users".* FROM "users" WHERE "users 
    "."id" = 3 LIMIT 1←[0m 
    ←[1m←[35mPassengerRide Load (0.0ms)←[0m SELECT "passenger_rides".* FROM "pass 
    enger_rides" WHERE "passenger_rides"."passenger_id" = 3 AND "passenger_rides"."r 
    ide_id" IS NULL LIMIT 1 
    WARNING: Can't mass-assign protected attributes: ride_id 
    Rendered microposts/_hopin.html.erb (4.0ms) 
    Rendered microposts/_ride_form.html.erb (9.0ms) 
    Rendered shared/_feed_item.html.erb (15.0ms) 
    Rendered shared/_feed.html.erb (20.0ms) 
    Rendered pages/home.html.erb within layouts/application (46.0ms) 
    Completed 500 Internal Server Error in 155ms 


    ActionView::Template::Error (undefined method `ride_id' for #<Micropost:0x5f53a1 

    0>): 
     1: <%= form_for(current_user.rides.build(ride_id: @micropost.id)) do |f| %> 
     2: <div><%= f.hidden_field :ride_id %></div> 
     3: <%= f.submit "Hop in", :class => "btn btn-large btn-primary" %> 
     4: <% end %> 
    app/views/microposts/_hopin.html.erb:2:in `block in _app_views_microposts__hop 
    in_html_erb___661389729_52209444' 
    app/views/microposts/_hopin.html.erb:1:in `_app_views_microposts__hopin_html_e 
    rb___661389729_52209444' 
    app/views/microposts/_ride_form.html.erb:6:in `_app_views_microposts__ride_for 
    m_html_erb___54007412_52167144' 
    app/views/shared/_feed_item.html.erb:12:in `_app_views_shared__feed_item_html_ 
    erb___851424678_48417588' 
    app/views/shared/_feed.html.erb:3:in `_app_views_shared__feed_html_erb___10631 
    41135_48687708' 
    app/views/pages/home.html.erb:19:in `_app_views_pages_home_html_erb__74940785_ 
    48176280' 

非常感谢你抽出时间来阅读，我不能更彻底！

Answer 1

不应该是passenger_rides而是rides在_hopin.html.erb部分？ I.e .:

<%= form_for(current_user.passenger_rides.build(ride_id: @micropost.id)) do |f| %> 
    <div><%= f.hidden_field :ride_id %></div> 
    <%= f.submit "Hop in", :class => "btn btn-large btn-primary" %> 
<% end %>