Ruby on Rails

help please write orm-request.

tables:
users:
id: integer
name: varchar

posts:
id: integer
title: varchar
user_id: integer
views: integer

models:
User:
class User < ActiveRecord::Base
  has_many    :posts,  dependent:  :destroy
end

Posts:
class Post < ActiveRecord::Base
  belongs_to  :user
end

controller:
def popular_diary
  @users =
User.joins(:posts).group_by(:user_id).order('SUM(posts.views)')
end

html:
  <% @users.each do |user| %>
    <div class="row">
      <%= link_to user_posts_url(user.id) do %>
        <div><%= user.name %></div>
      <% end %>
    </div>
  <% end %>

I need that all users hatched in a certain order. order ('SUM
(posts.views)

The problem is that the screen displays the following error message:
wrong number of arguments (0 for 1)

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