Question

如果我想让多个模型可以使用以下范围，我该怎么做而不必将它们直接添加到每个模型中？

    scope :today, -> { where("DATE(created_at) = DATE(?)", Date.today ) }
    scope :yesterday, -> { where("DATE(created_at) = DATE(?)", 1.day.ago) }
    scope :last_week, -> { where("DATE(created_at) = DATE(?)", 1.week.ago) }

Answer 1

其中一种规定方法是使用concerns。

您应该可以在app/models/concerns/dateable.rb：

创建这样的文件

module Dateable
  extend ActiveSupport::Concern

  included do
    scope :today, -> { where("DATE(created_at) = DATE(?)", Date.today ) }
    scope :yesterday, -> { where("DATE(created_at) = DATE(?)", 1.day.ago) }
    scope :last_week, -> { where("DATE(created_at) = DATE(?)", 1.week.ago) }
  end
end

然后include进入需要它的模型。

class Employee < ApplicationRecord
  include Dateable
end

class Customer < ApplicationRecord
  include Dateable
end

如何使范围可用于多个型号DRY

1 个答案: