https://medium.com/p/5c7797531d8a

20160202204325_create_people.rb

class CreatePeople < ActiveRecord::Migration
  def change
    create_table :people do |t|
      t.string :name
      t.timestamps null: false
    end
  end
end

20160202204723_create_addresses.rb

class CreateAddresses < ActiveRecord::Migration
  def change
    create_table :addresses do |t|
      t.string :street
      t.belongs_to :person

      t.timestamps null: false
    end
  end
end

address.rb

class Address < ActiveRecord::Base
  belongs_to :person
end

person.rb

class Person < ActiveRecord::Base
  has_many :address
end