Question

我正在尝试创建一个邀请系统，其中只有收到邀请者的用户才能注册。注册的用户可以为他们的朋友生成邀请代码。每个邀请都应属于用户。

这是控制器：

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

用户模型：

has_many :invites

在索引中：

<% 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 %>

在路线中：

resources :invites 
resources :users do
resources :invites 
end

以下是我遇到的错误：

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 >

当我

rails generate migration add_user_id_to_invites

Answer 1

尝试：

rails g migration AddUserRefToInvites user:references

生成user_id列和相应的索引：

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

为什么我的邀请系统没有工作？

1 个答案: