def users
      identifier = ::CurrentUser.identifier

      if identifier.respond_to? :call
        ::User.all.sort { |x,y| identifier.call(x) <=> identifier.call(y) }
      else
        ::User.order identifier.to_s
      end
    end
def users
      identifier = ::CurrentUser.identifier

      if identifier.respond_to? :call
        ::User.all.sort { |x,y| identifier.call(x) <=> identifier.call(y) }
      else
        ::User.order identifier.to_s
      end
    end
TODO: move it from the controller