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http://wiki.rubyonrails.org/rails/pages/Enum+Column+in+MySql

Enum Column in MySql

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Installation

Using the plugin script:

script/plugin install enum-column

To manually install using Subversion, do the following. In your vendor/plugins directory, type the following:

svn checkout svn://rubyforge.org/var/svn/enum-column

Otherwise visit:

http://rubyforge.org/projects/enum-column/

How to use it.
In your schema

When you create your schema, specify the constraint as a limit:

create_table :enumerations, :force => true do |t|
t.column :severity, :enum, :limit => [:low, :medium, :high, :critical],
:default => :medium
t.column :color, :enum, :limit => [:red, :blue, :green, :yellow]
...
end