【Rails】同じscopeはmoduleに共通化しよう

複数のクラスに共通するscopeがあるとき、moduleとして共通化する。

before

author.rb

class Author < ApplicationRecord
  scope :active, -> { where(state: 'active') }
end

book.rb

class Book < ApplicationRecord
  scope :active, -> { where(state: 'active') }
end

after

models/concerns/active_scope.rb

module ActiveScope
  extend ActiveSupport::Concern

  included do
    scope :active, -> { where(state: 'active') }
  end
end

author.rb

class Author < ApplicationRecord
  include ActiveScope
end

book.rb

class Book < ApplicationRecord
  include ActiveScope
end

RSpec

モデルと同じようにテストする

spec/models/active_scope_spec.rb

require 'rails_helper'

RSpec.describe ActiveScope, type: :model do
  describe '#active' do
    it '' do
       ...
    end
  end
end

参考