通過關聯創建新模型對象

Question

我認爲可以通過關聯創建新模型對象。

class Order < ActiveRecord::Base 
    belongs_to :basket 
end 

class Basket < ActiveRecord::Base 
    has_one :order 
end 

order = Order.new() 
basket = order.basket.new() # NoMethodError: undefined method `new' for nil:NilClass 

Answer 1

它，但你的語法是有點不對：

class Order < ActiveRecord::Base 
    belongs_to :basket 
end 

class Basket < ActiveRecord::Base 
    has_one :order 
end 

order = Order.new() 
basket = order.create_basket() 

使用build_basket，如果你不想立即保存籃筐;如果關係爲has_many :baskets，則使用order.baskets.create()和order.baskets.build()