[Rails] DRY up selects in view

[Jean-François]

Hello Bill,

> Here's what I've got:
>
> <% @fields.each do |field_name| %>
>   <tr>
>     <td>
>       <%= field_name.humanize %>
>     </td>
>     <td>
>     <% unless field_name =~ /_id$/ %>
>       <%= form.text_field field_name, :size => 40 %>
>     <% else %>
>       <%= select(:vendor,
>             field_name,
>             State.find(:all, :order => 'name').collect {|p| [ p.name,
> p.id ] },
>             :selected => @vendor.state.id ) %>
>     <% end %>
>     </td>
>   </tr>
> </end>
>
> Right now this works great if I only have "state_id" as the related
> field_name.  I could repeat this for every field_name ending in "_id",
> but that's not DRY.
>
> I'd like to allow this to work for any field_names ending in "_id" but I
> need to use the field_name without the "_id" and capitalized as the
> class name.  I know I'm thinking about this from a scripting POV, but
> can I get this done?

# field_name = "state_id"
...
class_name = field_name.gsub(/_id$/, '').camelcase
# => "State"
...
class_name.constantize.find :all ...
# => State.find :all ...
...
@vendor.send(class_name.underscore.to_sym)
# => @vendor.state

> Is there a better way to do this?

Not tested, but you get the idea to create your helper.

bye,

   -- Jean-François.

-- 
À la renverse.