Why instance methods?

migration4.0.rb

# Wouldnt it be cool if the Migration was further DSLed up to be just 

class CreatePosts < ActiveRecord::Migration
  change(:raise_down_error => false, :no_foreign_key_index => true) do 
    create_table :posts do |t|
      t.string :title
      t.text :body
    
      t.timestamps
    end
  end

  up(:if => Proc.new{}) do
    # stuff here
  end

  down do
    # stuff here
  end
end