On 5 May 2011, at 07:18, Fearless Fool <[email protected]> wrote:
> I have an STI class structure:
>
> class MeteredService < ActiveRecord::Base ; end
> class PGEService < MeteredService ; end
> class SCEService < MeteredService ; end
>
> In my view, I want update (say) the :resource field:
>
> <%= form_for(metered_service, :url =>
> metered_service_path(metered_service)) do |f| %>
> <%= f.text_field 'resource' %>
> <%= f.submit "update" %>
> <% end %>
>
> But this generates a params[] hash referring to (e.g.) the PGEService
> subclass rather than the MeteredService parent class:
>
> params = {
> "utf8"=>"✓",
> "_method"=>"put",
> "authenticity_token"=>"bAKcTUYbLZyGcMJPyf3zEiyjlB8aQlRv4lqZdiwElhE=",
> "pge_service"=>{"resource"=>"gas"},
> "commit"=>"update",
> "action"=>"update",
> "controller"=>"metered_services",
> "id"=>"54"}
>
> While I could put code in my metered_services_controller to recognize
> the subclass:
>
> def update
> @ms = MeteredService.find(params[:id])
> if @ms.update_attributes(params[@ms.class.name.underscore])
> ...
> end
>
> ... that doesn't smell right to me. There must be some
> Rails-appropriate trick that will let me write the canonical:
>
> def update
> @ms = MeteredService.find(params[:id])
> if @ms.update_attributes(params[:metered_service])
> ...
> end
>
> Am I right? What's the trick?
>
You might try form_for :metered_service, metered_service, ...
I also have vague memories of overwriting model_name in order to get sti
classes to behave nicely with a single set of resourceful routes/controllers
Fred
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