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我用Rails 3.1,并有一个简单的事务类引用一个用户模式:有belongs_to的关联使用ActiveRecord.create
class User < ActiveRecord::Base
has_many :transactions, :foreign_key => 'sender_id'
end
class Transaction < ActiveRecord::Base
belongs_to :sender, :class_name => 'User'
belongs_to :recipient, :class_name => 'User'
attr_accessible :amount
end
数据库模式是
create_table "transactions", :force => true do |t|
t.decimal "amount"
t.integer "sender_id", :null => false
t.integer "recipient_id", :null => false
end
create_table "users", :force => true do |t|
end
我想在seeds.rb
中创建一组初始事务,但从不生成底层INSERT
,外键为sender_id
和recipient_id
。该方法的签名是:
ruby-1.9.2-p290 :022 > Transaction.method(:create) =>
#<Method: Transaction(id: integer,
amount: decimal,
sender_id: integer,
recipient_id: integer)
(ActiveRecord::Base).create>
我都试过
Transaction.create(
amount: 0.50,
sender: User.first,
recipient: User.last,
)
和
Transaction.create(
amount: 0.50,
sender_id: User.first.id,
recipient_id: User.last.id,
)
在每种情况下,INSERT
声明
SQL (0.6ms) INSERT INTO `transactions` (`amount`, `recipient_id`, `sender_id`)
VALUES (0.75, NULL, NULL)
我'新的铁路,所以我'我确定这是我的一个误解,但是我一直没有能够从阅读rails文档中找到解决方案。