获得一个嵌套的对象收集槽活动记录 [英] Getting a nested object collection trough Active Record
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问题描述
我想检索对象槽活动记录名单,但没有成功。
I am trying to retrieve a list of object trough active record with no success
我有一个模型,它是:Store中有很多产品,产品有一个供应商
I have a model which is: Store has many Products, Product has one Supplier
class Store < ActiveRecord::Base
has_many :products
end
class Product < ActiveRecord::Base
belongs_to :supplier
belongs_to :store
end
class Supplier < ActiveRecord::Base
has_many :products
end
我想获得供应商存储槽的产品像这样的列表:
I am trying to get a list of suppliers from store trough product like this:
self.products.supplier
这让我从ActiveRecord的::关系一个未定义的方法异常供应商
This gives me a undefined method exception 'supplier' from ActiveRecord::Relation
我应该做一个自定义查找这个还是有更好的办法?
Should I make a custom finder for this or is there a better way?
推荐答案
您可以使用
self.products.map{|product| product.suppliers}
或者你可以做到这一点,这在我看来是更好的
Or you could do this, which is better in my opinion
class Store
has_many :suppliers, :through => :products
end
# Then you can use:
store.suppliers
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