Add record to a has_and_belongs_to_many relationship

Question

I have two models, users and promotions. The idea is that a promotion can have many users, and a user can have many promotions.

class User < ActiveRecord::Bas         


        

Answer 1

You can do just

User.promotions = promotion #notice that this will delete any existing promotions

or

User.promotions << promotion

You can read about has_and_belongs_to_many relationship here.