ruby-on-rails - 在两个实例化对象之间创建关联

Question

我有两个模型：（专辑和产品）

1) 内部模型

里面的专辑.rb：

class Album < ActiveRecord::Base
  attr_accessible :name
  has_many :products
end

product.rb 内部：

class Product < ActiveRecord::Base
  attr_accessible :img, :name, :price, :quantity
  belongs_to :album
end

2）使用“ rails console ”，我如何设置关联（所以我可以使用“<%= Product.first.album.name %>”）？

例如

a = Album.create( :name => "My Album" )
p = Product.create( :name => "Shampoo X" )
# what's next? how can i set the album and the product together?

Answer 1

You can do like this:

a = Album.create( name: "My Album" )

p = Product.create( name: "Shampoo X" )
# OR
p = Product.create( name: "Shampoo X", album_id: a.id )
# OR
p.album = a
# OR
p.album_id = a.id
# OR 
a.products << a
# finish with a save of the object:
p.save

You may have to set the attribute accessible to album_id on the Product model (not sure about that).

Check @bdares' comment also.

Answer 2

创建产品时添加关联：

a = Album.create( :name => "My Album" )
p = Product.create( :name => "Shampoo X", :album => a )