quick syntax question - newbie

rubyonrails-talk
1

Hi all, am writing a simple app that lets me pick a post type to go under National or International. the code bellow generates a drop-down from where I can pick the options

<div>    <%= f.collection_select :postType_id, PostType.all(:order => "name ASC"), :id, :name %> </div>

what would be the syntax for this if instead I wanted to have two radio buttons I search for some sample code but all i've found is only with hard coded strings.

any idea how I can generate two radio buttons for: O National O International

? any help will be greatly appreciated. oli.

2

I think you’re looking for something like radio_group. Based on your previous example, I would code it as:

<%= f.radio_group :postType_id, PostType.all(:order => “name ASC”).map {|pt| [ pt.id, pt.name ] }

3

Chris, thanks. but iam getting an this error after trying your code: undefined method `radio_group’ for #ActionView::Helpers::FormBuilder:0x1034d6800

am not sure if it is because this is a rails 3 app?

I googled this error but noting seemed helpful

<%= f.radio_group :postType_id, PostType.all(:order => “name ASC”).map {|pt| [ pt.id, pt.name ] }%>

any further help will be great.

oli.

4

it should be f.radio_button. more samples at http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-radio_button

5

Ah, yes. Sorry about that. The radio_group method isn’t a part of the FormBuilder, so while you can still call it within the scope of the form_for block, you can’t call it the way I told you to.

You will need to call it similar to:

<%= form_for @post do |f| %>

…

<%= radio_group "post[postType_id]", PostType.all(:order => "name ASC").map {|pt| [ [pt.id](http://pt.id/), [pt.name](http://pt.name/) ] }

…

<% end -%>

This should work if you adjust the code to your particular situation, but post back if not.

6

Ah, yes. Sorry about that. The radio_group method isn’t a part of the FormBuilder, so while you can still call it within the scope of the form_for block, you can’t call it the way I told you to.

So there really is a radio_group helper? There’s nothing about it in the api. Any links?

7

Er, yeah, that’s not going to work. It’s actually part of the Ruby standard lib as part of CGI::HtmlExtension, and now that I’m looking at it more closely, it’s not compatible with Rails use. My bad. Rails only supports the radio_button helper, as Jim pointed out.