[Rails] Where is create_table method defined?

[grz01]

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