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我有了以下型号的应用程序: - 类别 - 次 - 产品 - ProductSubcategory的has_many到HAS_MANY到HAS_MANY关系
我的关系如下:
Category has_many :subcategories
Subcategory belongs_to :category
Subcategory has_many :product_subcategories
Subcategory has_many :products, through: :product_subcategories
Product has_many :product_subcategories
Product has_many :subcategories, through: :product_subcategories
我想从一个类别访问所有产品。最好的方法是什么?我试过类别has_many:product_subcategories,通过::类别,但它没有工作。无论如何,我可以做到吗?
编辑:
SELECT products.* FROM products
INNER JOIN product_subcategories
ON product_subcategories.product_id = products.id
INNER JOIN subcategories
ON product_subcategories.subcategory_id = subcategories.id
INNER JOIN categories
ON categories.id = subcategories.category_id
WHERE
categories.id = 1;
感谢提前:)
你的'schema.rb'看起来像什么? – BalinKingOfMoria