I want to be able to do Artist.case_insensitive_find_or_create_by_name(artist_name)[1] (and have it work on both sqlite and postgreSQL)

What's the best way to accomplish this? Right now I'm just adding a method directly to the Artist class (kind of ugly, especially if I want this functionality in another class, but whatever):

  def self.case_insensitive_find_or_create_by_name(name)
    first(:conditions => ['UPPER(name) = UPPER(?)', name]) || create(:name => name)
  end

[1]: Well, ideally it would be Artist.find_or_create_by_name(artist_name, :case_sensitive => false), but this seems much harder to implement