just some error im getting trying to do a migration in rails 3

20110909202649_create_evaluator_relations.rb

#the actual migration generated....

class CreateEvaluatorRelations < ActiveRecord::Migration
  def self.up
  end

  def self.down
  end
end


#total... no errors but the generated migration is not what I expected...

console input

$ rails generate migration CreateEvaluatorRelation evaluation_id:integer evaluator_user_id:integer evaluated_user_id:integer relation_id:integer competence_id:integer behavior_id:integer ideal:integer score:float
      invoke  active_record
      create    db/migrate/20110909201938_create_evaluator_relation.rb