Ruby on Rails

please help solve the problem.
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
  @diaries =
User.joins(:posts).group(:user_id).order('SUM(posts.views)')
end

the result @diaries contains a collection users, sorted by the number of
views. in ascending order (ASC). but I need to get a collection of
users, sorted in descending order (DESC).

I have tried to do so:
@diaries = User.joins(:posts).group(:user_id).order('SUM(posts.views)
:DESC')

but I got an error message:
SQLite3::SQLException: near ":DESC": syntax error: SELECT "users".* FROM
"users" INNER JOIN "posts" ON "posts"."user_id" = "users"."id" GROUP BY
user_id  ORDER BY SUM(posts.views) :DESC

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