Rails 3: belongs_to, has_one and Migrations

Question

I\'m new to Rails, and I\'m coming to it from a Django background. I\'ve come to terms with the fact that models and the database schema are separate in Rails, online Django

Answer 1

You have to add the foreign key in your migration file, something like this:

def change
  create_table :songs do |t|
    t.references :artist
  end

  add_index :songs, :artist_id
end

Answer 2

Now, in Rails 4 you can do:

class AddProcedureIdToUser < ActiveRecord::Migration
  def change
    add_reference :users, :procedure, index: true
  end
end

to an existing Model

Answer 3

You can generate migration

rails g migration AddProcedureIdToUser procedure:references 

Thanks