#create tables
create_table :people do |t|
  t.string :name
  t.timestamps
end

create_table :hats do |t|
  t.string :type
  t.integer :person_id
  t.timestamps
end

#models
class Person < ActiveRecord::Base
  has_many :hats
end

class Hat < ActiveRecord::Base
  belongs_to :person
end

#somewhere in a controller
@hat = @person.hats.new
@hat.person #<==== is this possible automatically?