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ActiveRecord Has many through and assignment

With Has many through associaitions if you do a simple assignment of an entire collection it does not work.

eg.
2 models Asset and Client have a has_many through relation ship with each other through AssetClient.

The following does not work

@asset.clients = @clients

So a method is needed in Asset like so to make it work.

def clients=(new_clients)
  new_clients.each do |item|
    clients << item unless clients.include?(item)
  end
  clients_to_remove = clients - new_clients
  clients_to_remove.each do |item|
    clients.delete(item)
  end
end