ActiveRecord: Update a record if exists else create?

Question

Trying to implement an create if not exists else update record in Active Record.

Currently using:

@student = Student.where(:user_id          


        

Answer 1

In Rails 5

Student.
  find_or_initialize_by(:user_id => current_user.id).
  update(:department => 1)

(with all credit taken from @Zorayr answer).