Rails - Apr 2006 - collection_select returning multiple values

Hey,

 

Is is possible to make collection_select return multiple values? If yes, how
can it be done?

 

I?ve tried:

<%= collection_select("group[]", "id", @groups,
"id", "name", {},{:multiple
=> true}) %>

Leading to: 

You have a nil object when you didn''t expect it!

You might have expected an instance of ActiveRecord::Base.

The error occured while evaluating nil.id_before_type_cast

 

The @groups is Group.find(:all).

 

Can anyone help?

 

Thanks in advance,

R?ben Caba?o

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