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我有一个具有三个模型的 Rails 应用程序：帐户、包裹和交付。我在 Delivery 上使用 AR::Relation 范围来查找最近的交付和退货。Account 模型还需要查找最近交付的帐户。 我可以在 Account via 中使用相同的交付范围joins吗？ 现在我正在使用这样的代码（注意和中的重复Account.with_recent_returns）Delivery.recent_returns：

# Package(id: integer, ident: string)

class Package < ActiveRecord::Base
  has_many :deliveries, :dependent => :destroy
end

# Delivery(id: integer, account_id: integer, delivered_on: date, package_id: integer, returned_on: date)`

class Delivery < ActiveRecord::Base

  belongs_to :account
  belongs_to :package

  scope :current, where(:returned_on => nil)

  scope :recent_deliveries, where('delivered_on >= ?', 2.weeks.ago)

  scope :recent_returns, where('returned_on >= ?', 2.weeks.ago)

  scope :returns, where('returned_on IS NOT NULL')
end

#  => Account(id: integer, name: string)

class Account < ActiveRecord::Base

  has_many :deliveries, :dependent => :destroy

  def self.with_current_deliveries
    joins(:deliveries).where(:deliveries => { :returned_on => nil } ).includes(:deliveries)
  end


  def self.with_recent_returns
    joins(:deliveries).where('deliveries.returned_on >= ?', 2.weeks.ago).includes(:deliveries)
  end
end
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1 回答 1

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我相信这样的事情会奏效

scope :recent_deliveries, joins(:deliveries).merge(Delivery.recent)

或者你可能需要使用 scoped

scope :recent_deliveries, scoped.joins(:deliveries).merge(Delivery.recent)

应该让你开始。

于 2012-05-31T15:49:12.213 回答