[Rails] create_table with unique combo

[slava]

I need to create a table replacing default integer id with a string id
and making a combo of (id and version) unique primary key. Here is
what I've got so far.

class CreateCatalogs < ActiveRecord::Migration
  def self.up
    create_table :catalogs, :id => false do |t|
      t.string :id, :limit => 20, :null => false
      t.string :version, :default => '01'

      t.timestamps
    end
  end

  def self.down
    drop_table :catalogs
  end
end

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