Where is create_table method defined?

Hi

When scaffolding a model with Rails, you will get a migration file, say 001_create_items.rb that looks something like this:

class CreateItems < ActiveRecord::Migration   def self.up     create_table :items do |t|       ...     end   end

  def self.down     drop_table :items   end end

My question is: Where is this method 'create_table' defined in Rails? I was expecting to find it in the superclass ActiveRecord::Migration which I think is defined in file .../lib/active_record/migration.rb But I cannot find it there.

Anyone has a clue?

TIA ------------- grz01