Rails-HABTM和has_many通过的不良影响一起使用吗？

Question

I have an association,

Shop habtm Products
Product habtm Shops

Shop belongs_to Merchant

For convenience, I also declared a

Merchant has_many :products, :through=>:shops

In my products controller,

@products = current_user.merchant.products

When I <%=debug @products %> , the collection includes multiple copies of the same object.

Is this normal or have I screwed myself by declaring HABTM and has_many through together?

If this is normal, is there a way to call the products without duplicate entries appearing?

Thank you.

Update

I realized this should be okay because the habtm is between Shops and Products . The Merchant has_many Products . Is it possible to call something like a product.merchant without setting a foreign key inside the product model?

Answer 1

如果您的商人有一些商店提供相同的产品，这是正常的行为。

Answer 2

您可以使用distinct ：

@products = current_user.merchant.products.distinct(:product_id)