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

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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