當有連接時，Active Record不會更新集合並且包含在查詢中

Question

您好，我的查詢存在問題。 有我的模型如下：

class Owner 
    has_many :busiensses 
    has_many :adverts 
end 

class Business 
    belongs_to :owner 
end 

class Advert 
    belongs_to :owner 
end 

當我做這個查詢一切正常，並返回正確的集合全所需要的對象：

Owner.joins(:adverts).includes(:businesses) 
    .where(businesses: {owner_id: nil}) 

但當我添加到查詢更新它會引發錯誤

Owner.joins(:adverts).includes(:businesses) 
    .where(businesses: {owner_id: nil}) 
    .update_all(status: 'sth') 

錯誤：

ActiveRecord::StatementInvalid: PG::UndefinedTable: ERROR: missing FROM-clause entry for table "businesses" 

問題在哪裏？我敢打賭，這個錯誤從SQL和它引發時，你忘記添加......到從聲明和sth需要在進一步的條件，但在AR我忘了補充它？

Answer 1

Owner.joins(:adverts) 
.includes(:businesses) 
.where(businesses: {owner_id: 1}) 
.update_all(name: "blaaaaa") 

此語句轉換成此查詢：

UPDATE "owners" 
SET "name" = 'blaaaaa' 
FROM "businesses" /* missed this */ 
WHERE "owners"."id" IN 
(SELECT "owners"."id" FROM "owners" 
INNER JOIN "adverts" 
ON "adverts"."owner_id" = "owners"."id" 
WHERE "businesses"."owner_id" = 1) 

你錯過這會導致錯誤的"FROM 'bussinesses'"：

missing FROM-clause entry for table "businesses"

我的解決方案是使用joins而不是使用includes。它在我的機器中工作正常。

Owner.joins(:adverts) 
.joins(:businesses) 
.where(businesses: {owner_id: 1}) 
.update_all(name: "blaaaaa") 

=> 1