auto_complete_for - return id

That's provided by model_auto_completer:

   http://agilewebdevelopment.com/plugins/model_auto_completer

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The usual idiom is to cd into the root directory of your Rails application and execute this command:

   script/plugin install svn://rubyforge.org/var/svn/model-ac/trunk/vendor/plugins/model_auto_completer

Please note that is a single line, in case the mail gets wrapped.

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You could try again with -v:

   script/plugin -v install URL

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