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

Use a custom joins statement:

Group.joins("left outer join user_group_cmbs as cmb on groups.id = cmb.group_id")
  .where("cmb.user_id = ?", 1)