Collection_select

rubyonrails-talk
1

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?

2

you r fetching entire Equipo tables.

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

regards mathew

3

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?

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. combo.js · GitHub

Walter