How to dynamically query enum values from Postgresql in Rails

example.rb

sql = %{
  select enumlabel 
  from pg_enum 
  where enumtypid = 'company_status'::regtype 
  order by oid
}

result = ActiveRecord::Base.connection.execute(sql)

result.each do |row|
  puts row['enumlabel']
end

structure.sql

CREATE TYPE company_status AS ENUM (
    'Client',
    'Partner',
    'Vendor',
    'Other'
);

CREATE TABLE companies (
    id integer NOT NULL,
    name text NOT NULL,
    status company_status DEFAULT 'Other'::company_status NOT NULL,
);

Credit: http://archives.postgresql.org/pgsql-novice/2008-12/msg00051.php