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在我的項目中,我使用closure_tree
寶石,並希望在我的Product
模型上編寫自定義方法,該方法返回給定集合的所有父級。從現有的ActiveRecord獲取一個空白的新關係::關係
我試着寫類方法:
class Product < ActiveRecord::Base
has_closure_tree
def self.tree_parents
root_product_ids = []
all.each do |product|
root_product_ids << (product.root? ? product.id : product.parent_id)
end
Product.where(id: root_product_ids)
end
end
返回的關係將被合併到以前的,但我需要這個方法返回絕對新的獨立ActiveRecord::Relation
:
» leaf_product = Product.where(id: 219)
Product Load (0.7ms) SELECT "products".* FROM "products" WHERE "products"."deleted_at" IS NULL AND "products"."id" = 219
=> #<ActiveRecord::Relation [#<Product id: 219, name: ... ]>
» leaf_product.tree_parents
Product Load (1.0ms) SELECT "products".* FROM "products" WHERE "products"."deleted_at" IS NULL AND "products"."id" = 219
Product Load (0.7ms) SELECT "products".* FROM "products" WHERE "products"."deleted_at" IS NULL AND "products"."id" = 219 AND "products"."id" IN (1)
=> #<ActiveRecord::Relation []>
總之我希望此方法僅返回Product.where(id: root_product_ids)
,並且不要將其與Product.where(id: 219)
鏈接起來。
如何返回僅包含IN
聲明的新關係而沒有父關係聲明WHERE id ...
?