Rails - Dec 2007 - combobox and m:n relation

Hi,

i have a project and a task. both have a m:n relation to each other. I
made a scaffolding and want to insert a combobox in the task new view


Code :  ruby - fold - unfold

    <label
for="project_name_ger">Poject</label><br/>
        <%= select "task[projects_id][]", "project_id",
             Project.find(:all).collect {|c| [c.name_ger, c.id]},
             :prompt => "Select a Category" %>

the code does not work. does anyone has an idea how to save the
combobox''s content. it works for a 1:n relation because i just have to
save the task which has a projekt_id but with a m:n relations it is
different.

thank you
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