如何使示波器可用于多种型号DRY

Question

If I want to make the following scopes available to multiple models how do I do so without having to add them directly into each model?

    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

One of the prescribed ways is by using concerns .

You should be able to create a file like this at app/models/concerns/dateable.rb :

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

Then include it into the models that need it.

class Employee < ApplicationRecord
  include Dateable
end

class Customer < ApplicationRecord
  include Dateable
end