`in' form generator for Rails Model

in.rb

#
# [Param] String column
# [Param] Array items
# [Return] String
#
def self.in( column, items )
  if ( items.respond_to? :map and items.size > 0 )
    sprintf( "#{column} in ( %s )",
             items.map { |e|
               ( e.is_a? String ) ? sanitize(e) : e
             }.join( ', ' ) )
  else
    ''
  end
end