我在使用 ruby on rails 时遇到了一些问题,特别是通过 deal_event 建立与交易和事件的多对多连接。我已经检查了几个类似的 stackoverflow 问题,甚至http://guides.rubyonrails.org/但我仍然没有得到任何东西..
这是我的模型:
交易.rb
class Deal < ActiveRecord::Base
has_many :deal_events
has_many :events, :through => "deal_events"
attr_accessible :approved, :available, :cents_amount, :dollar_amount, :participants, :type
end
事件.rb
class Event < ActiveRecord::Base
has_many :deal_events
has_many :deals, :through => "deal_events"
attr_accessible :day, :image, :description, :location, :title, :venue, :remove_image
end
交易事件.rb
class DealEvent < ActiveRecord::Base
belongs_to :deal
belongs_to :event
end
这是我的迁移文件:
20130102150011_create_events.rb
class CreateEvents < ActiveRecord::Migration
def change
create_table :events do |t|
t.string :title, :null => false
t.string :venue
t.string :location
t.text :description
t.date :day
t.timestamps
end
end
end
20130112182824_create_deals.rb
class CreateDeals < ActiveRecord::Migration
def change
create_table :deals do |t|
t.integer :dollar_amount
t.integer :cents_amount
t.integer :participants
t.string :type, :default => "Deal"
t.integer :available
t.string :approved
t.timestamps
end
end
end
20130114222309_create_deal_events.rb
class CreateDealEvents < ActiveRecord::Migration
def change
create_table :deal_events do |t|
t.integer :deal_id, :null => false
t.integer :event_id, :null => false
t.timestamps
end
end
end
在我用一笔交易和一项事件播种我的数据库后,我进入控制台并输入
deal = Deal.first # ok
event = Event.first # ok
DealEvent.create(:deal => deal, :event => event) # Error: ActiveModel::MassAssignmentSecurity::Error: Can't mass-assign protected attributes: deal, event
deal.events # Error: ActiveRecord::HasManyThroughAssociationNotFoundError: Could not find the association "deal_events" in model Deal
关于弹出这两个错误我做错了什么的任何想法?谢谢。