refine test

aa.rb

#===============================================================================
# app/models/*.rb
#===============================================================================
class Company
  has_many :users
  has_many :admins
end

class User
  belongs_to :company
end

class Admin
  belongs_to :company
end

#===============================================================================
# app/jobs/hoge_job.rb
#===============================================================================
class HogeJob < ApplicationJob
  # Company, Admin, Userそれぞれ#to_hで同じキーを持つHashにしたい
  # ほぼ100%このHogeJobでしか使わないので、中に入れたい気持ちがある
  module BenriModule
    refine Company do
      def to_h
        { email: contact_email, lang: default_lang, type: 'admin', company_code: code }
      end
    end

    refine Admin do
      def to_h
        { email: email, lang: lang, type: 'admin', company_code: company.code }
      end
    end

    refine User do
      def to_h
        { email: email, lang: lang, type: 'service', company_code: company.code }
      end
    end
  end

  using BenriModule

  def perform(type)
    # to_hしたものをメーラーに渡したい
    announcemt_targets(type).each { |target| SugoiMailer.say_hello(target).deliver_later }
  end

  private

  def announcemt_targets(type)
    case type
    when 'company' then admins + company_contacts
    when 'user'    then users
    end
  end

  # モデル毎にスコープが違う
  def admins
    Admin.hoge.map(&:to_h) # NoMethodError
  end

  def company_contacts
    Company.fuga.map(&:to_h) # NoMethodError
  end

  def users
    User.piyo.map(&:to_h) # NoMethodError
  end
end

.map(&:to_h) → .map { |a| a.to_h }

にすれば動いた
でもrubocopに怒られるのでつらい…