沒有爲表「商店」的條目，但它不能從查詢

Question

我想從我的店選擇最新的4個交易的這部分引用，與has_and_belongs_to_many關係，並即時得到這個錯誤：

There is an entry for table "stores", but it cannot be referenced from this part of the query

class Deal < ActiveRecord::Base 
    has_and_belongs_to_many :stores 
end 

class Store < ActiveRecord::Base 
    has_and_belongs_to_many :deals 
end 

我的查詢

SELECT * FROM (SELECT stores.id AS store_id,  deals.*, 
     dense_rank() OVER (
     PARTITION BY deals.stores.id 
     ORDER BY deals.created_at DESC 
    ) AS deal_rank 
FROM "deals" 
INNER JOIN "listings" 
ON "listings"."deal_id" = "deals"."id" 
INNER JOIN "images" 
ON "images"."id" = "deals"."image_id" 
INNER JOIN "deals_stores" 
ON "deals_stores"."deal_id" = "deals"."id" 
INNER JOIN "stores" 
ON "stores"."id" = "deals_stores"."store_id" 
ORDER BY deals.created_at desc) 
AS ranked_deals 
WHERE (deal_rank <= 4) 

Answer 1

在定義的habtm的關係，你應該更喜歡的複數形式。

您需要更改

has_and_belongs_to_many :store

到

has_and_belongs_to_many :stores