How can I do a LEFT OUTER JOIN using Rails ActiveRecord?

Question

I don\'t have any ideas. Could you give me any clues (like reference sites). Any help will be appreciated.

Model1: GROUP         


        

Answer 1

Rails 5+ allows you to do the following:

Group.left_outer_joins(:user_group_cmb)

http://api.rubyonrails.org/classes/ActiveRecord/QueryMethods.html#method-i-left_joins