Rails - Nov 2008 - Undefined method "add_reference"

Greetings,

I try to add a foreign key in one of my rails migrations in the
following way:

def self.up
         add_reference :categories, :items
end

This, strangely, leads to the following error during the migration:

-- add_reference(:categories, :items)
rake aborted!
undefined method `add_reference'' for #


In the same way fails the code:

def self.up
  change_table :categories do |t|
      t.references :items
  end
end


I recently upgraded to Rails 2.1.2, if this is relevant to my case. Does
anyone have any pointers on how to solve this problem?

Thanks in advance!
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