scope :admins, -> { joins(:user).where('users.role = ?', '1') }
scope :users_and_approved, -> { joins(:user).where('users.role = ? AND approved = ?', '0', true) }

def self.index_services
  admins = Service.admins.order({ updated_at: :desc })
  users = Service.users_and_approved.order({ updated_at: :desc })
  admins.or(users)
end