Rails groupでカラム別にcountする

countする時groupでカラム別にcountする

#Userモデル
User(id: integer, email: string, status: integer)

# User.statuses
{"init"=>0, "using"=>1}

User.all.count
   (233.9ms)  SELECT COUNT(*) FROM `users`
 => 10 

User.all.group(:status).count
   (135.6ms)  SELECT COUNT(*) AS count_all, `users`.`status` AS users_status FROM `users` GROUP BY `users`.`status`
 => {"init"=>4 "using"=>6}