http://github.com/akm/selectable_attr/ と http://github.com/akm/schema_comments/ の説明です。

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3. <select id="product_media" name="product[media]">
<option value="01"> </option>
<option value="02">CD</option>
<option value="03" selected="selected">CD-ROM</option>
<option value="04">DVD</option>
<option value="05">Blueray</option>
<option value="06"> </option>
</select>
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17. ActiveRecord::Schema.define(:version => 1) do
create_table "products", :force => true, :comment => ' ' do |t|
t.string "product_type_cd", :comment => " "
t.integer "price", :comment => " "
t.string "name", :comment => " "
t.datetime "created_at", :comment => " "
t.datetime "updated_at", :comment => " "
end
end
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20. # == Schema Info ==
#
# Schema version: 20090721185959
#
# Table name: books #
#
# id :integer not null, primary key
# title :string(100) not null #
# size :integer not null, default(1) #
# price :decimal(17, 14) not null, default(0.0) #
# created_at :datetime #
# updated_at :datetime #
#
# =================
#
class Book < ActivrRecord::Base
end
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