Ruby on Rails

Hi,

Is it possible to do a left outer join in Rails4. This is my model and I am trying to write a scope which will do a left outer join of users with the message, comments and likes tables and then group by id to get total count. 

So the final result set would be cuuser.*, message_count, likes_count and comments_count. Any idea how this can be accomplished? Thanks in Advance!

class Cuuser < ActiveRecord::Base
  
	has_and_belongs_to_many :groups
	has_many :messages
  
	has_many :comments
	has_many :likes
  
 
	validates :username, format: { without: /\s/ }
  
	scope :superusers, -> { joins(:comments, :likes).
  
		select('cuusers.id').
  
		group('cuusers.id').
  
		having('count(comments.id) + count(likes.id) > 2')}