Rails 一对多

数据表关联设置

ActiveRecord可以用Associtions来定义数据表之间的关联性。

一对多关系 one-to-many

代表一个events有多个attendees

rails g model events name:string
# 创建attendee表的model
rails g model attendee name:string event_id:integer

class Event < ActiveRecord::Base
    validates_presence_of :name
    has_many :attendees # 复数
end

class Attendee < ActiveRecord::Base
    belongs_to :event     
end

#routes.rb
resources :events do
    resources :attendees, :controller => "attendees"
end

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