rails 3 ActiveRecord協會

Question

我有這4個模型通過has_many，belongs_to相互關聯。基本是2（食譜，配料）。另外2個商店基於前兩個存儲額外的信息。

class Recipe 
    has_many :ingredients, :through => :prescriptions 
    has_many :prescriptions 
end 

class Ingredient 
    has_many :recipes, :through => :prescriptions 
    has_many :prescriptions 
    has_many :stocks 
end 

class Stock 
    belongs_to :ingredient 
end 

class Prescription 
    belongs_to :recipe 
    belongs_to :ingredient 
end 

我嘗試獲取食譜有哪些可用庫存，即Recipe.joins（：成分）.joins（：股），但是，我得到一個錯誤：

ActiveRecord::ConfigurationError: Association named 'stock' was not found; perhaps you misspelled it? 

SQL查詢我試圖達到的是：

SELECT "recipes".* FROM "recipes" 
INNER JOIN "prescriptions" 
ON "prescriptions"."recipe_id" = "recipes"."id" 
INNER JOIN "ingredients" 
ON "ingredients"."id" = "prescriptions"."ingredient_id" 
--- 
INNER JOIN "stocks" 
ON "stocks"."ingredient_id" = "ingredients"."id" 
--- 

最後一個「INNER JOIN」是我無法在rails 3代碼中解釋。有任何想法嗎？

謝謝

Answer 1

沒有一個模型來驗證，但是從我的頭頂，你需要告訴它你沒有參加過原始模型

Recipe.joins(:ingredients).joins(:ingredients => :stocks).select: