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?

you r fetching entire Equipo tables.

you have to use distinct option to get (A,B,C) alone

Equipo.find(:all,:select=>“distinct(group)”)

try this out

regards
mathew

On Oct 9, 2011, at 11:09 PM, JavierQQ wrote:

GroupB 06A

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?

If you have this specific data in your table, then I’m not sure what
your collection_select is meant to represent. Your data are unique at
the row level, so if you had a picker with id and name as value and
label, which one of the rows in your database should represent GroupA?
The one with code 07A? 10B? Those rows would have distinct id values,
naturally. By that logic, what you are seeing in your collection_select
is precisely what I would expect to see.

Now if you only want to populate your picker with the “group name” and
you want it to be a distinct selection, here’s what I use for that:

<%= f.collection_select( :nationality,
(Person.connection.select_values(‘select distinct(nationality) from
people’).sort), :to_s, :to_s, {:prompt => true}) %>

On an admin form, I usually combine that with a bit of JavaScript to
create a “combo-box” so the user can add new values to the picker at
will. https://gist.github.com/1275185

Walter

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