[Rails] Collection_select

Hi,

I'm new using RoR and I have a ... trouble with
f.collection.select

What I have in a table is ... for example
group code
GroupA 07A
GroupA 08A
GroupA 10B
GroupB 06A
GroupB 11B
GroupB 07B
GroupC 10A
GroupC 09A
GroupC 09B

when I use

<%= f.collection_select :grupo, Equipo.find(:all), :id, :name, prompt:
'Choose a Group' %>

It shows the entire set of groups (9 groups) instead of only 3 (Group
A, Group B, Group C)

How can I make that it shows only one instead of 3 of each one?

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