ruby-on-rails 如何通过has_many关联覆盖ActiveRecord关系

tzdcorbm 于 2023-11-20 发布在 Ruby

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所以我有一定的冰淇淋，我想得到的销售额在安大略的低脂冰淇淋和非过期，说。
IceCream有_多个安大略_sales_receipts：

included_ice_cream = IceCream.produced_this_or_previous_month.where(low_fat: true, expired: false)

final_amount = included_ice_cream.ontario_sales_receipts.pluck(:number_of_buckets).sum * BUCKET_PRICE

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但这会导致：

undefined method `ontario_sales_receipts' for #<IceCream::ActiveRecord_Relation:0x0055de80e3ffa8>

型
如何从ActiveRecord关系中提供has_many关联？
我最初可以查询OntarioSaleRecept，但我不知道如何根据它们与特定IceCream的has_one关联来查询它们

included_ontario_sales_receipts = OntarioSalesReceipt.where( their associated IceCream is lowfat and non expired ... )

型

ruby-on-rails

来源：https://stackoverflow.com/questions/77447436/how-to-iterate-over-activerecord-relation-through-a-has-many-association

1条答案

按热度按时间

hgb9j2n61#

included_ice_cream = IceCream.produced_this_or_previous_month.where(
      low_fat: true,
      expired: false
    )
    total_amount = final_amount(included_ice_cream)

    def final_amount(included_ice_cream)
      included_ice_cream.map do |ice_cream|
        ice_cream.ontario_sales_receipts.pluck(:number_of_buckets).sum *
          BUCKET_PRICE
      end.sum
    end

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这个怎么样？

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ruby-on-rails 如何通过has_many关联覆盖ActiveRecord关系

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