Example of Query Object extending scopes

users_query_with_scopes.rb

class UsersQuery
  attr_reader :relation
  
  def initialize(relation = User.all)
    @relation = relation.extending(Scopes)
  end
  
  def subscribed
    relation.subscribed
  end
  
  def without_recent_views
    relation.where('last_visited < ?', User::RECENT_VISITED_DAYS.days.ago)
  end
  
  def for_notifications_of_similar_purchases
    relation.with_recent_purchases.subscribed
  end
  
  module Scopes
    def subscribed
      where(receive_email_notifications: true)
    end
    
    def with_recent_purchases
      joins(:orders)
        .where(fulfilled: true)
        .and('orders.updated_at > ?', User::RECENT_ORDER_DAYS.days.ago)
    end
  end
end