爲什麼我的邀請系統不工作？

我正嘗試創建一個邀請系統，其中只有收到邀請的用戶才能註冊。註冊的用戶可以爲他們的朋友生成邀請碼。每個邀請都應該屬於一個用戶。爲什麼我的邀請系統不工作？

這裏的控制器：

class InvitesController < ApplicationController 
def new 
    @invite = current_user.invites.new 
end 
def create 
    @user = current_user 
    @invite = @user.invites.create 
    @invite.code = rand(1000..9000) 
    end 
end

用戶模型：

has_many :invites

在索引：

<% if user_signed_in? %> 
<%= form_for @invite, remote: true do |f| %> 
<%= f.hidden_field :user_id, :value => current_user.id %> 
    <%= f.submit 'post', class: '', name: 'post' %> 
<% end %> 
<% end %>

在路線：

resources :invites 
resources :users do 
resources :invites 
end

這是我得到的錯誤：

NameError: undefined local variable or method `add_user_id_to_invites' for main:Object 
    from (irb):6 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.5/lib/rails/commands/console.rb:110:in `start' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.5/lib/rails/commands/console.rb:9:in `start' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:68:in `console' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:39:in `run_command!' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.5/lib/rails/commands.rb:17:in `<top (required)>' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:274:in `require' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:274:in `block in require' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:240:in `load_dependency' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:274:in `require' 
    from /home/ubuntu/workspace/bin/rails:9:in `<top (required)>' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:268:in `load' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:268:in `block in load' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:240:in `load_dependency' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:268:in `load' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.7.0/lib/spring/commands/rails.rb:6:in `call' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.7.0/lib/spring/command_wrapper.rb:38:in `call' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.7.0/lib/spring/application.rb:191:in `block in serve' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.7.0/lib/spring/application.rb:161:in `fork' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.7.0/lib/spring/application.rb:161:in `serve' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.7.0/lib/spring/application.rb:131:in `block in run' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.7.0/lib/spring/application.rb:125:in `loop' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.7.0/lib/spring/application.rb:125:in `run' 
    from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.7.0/lib/spring/application/boot.rb:19:in `<top (required)>' 
    from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require' 
    from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require' 
    from -e:1:in `<main>'2.3.0 :007 >

當我

rails generate migration add_user_id_to_invites

來源

2016-06-09 Malek Zalfana

什麼是s你遇到的特殊問題？有錯誤嗎？你看到意外的行爲？請更具體地說明您的問題，以便我們能夠更好地幫助解答。謝謝！ –

對不起，只是添加了錯誤。 –

不用擔心！該錯誤表明「Invite」模型沒有「user_id」的屬性或數據庫列。你的'db/schema.rb'告訴你什麼？ 'invites'表是否存在'user_id'列？你是否已經爲此創建了遷移？也許你只是忘了運行它。 –

嘗試：

rails g migration AddUserRefToInvites user:references

產生一個user_id列和相應的索引：

class AddUserRefToInvites < ActiveRecord::Migration[5.0] 
    def change 
    add_reference :invites, :user, index: true, foreign_key: true 
    end 
end

來源

2016-06-09 17:06:55 Alex

謝謝你，但它解決了這個問題，但當我請求任何邀請時，我返回＃，如@ user.invites.all。你知道爲什麼嗎？ –

你在控制檯中獲得了嗎？如果是這樣，看起來你沒有任何用戶邀請...由於關係是空的，所以Rails只是回饋對象類型。 – Alex

我檢查了控制檯，我確實創建了邀請。 –

爲什麼我的邀請系統不工作？

回答

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