ruby on rails variable to controller - ruby-on-rails-3

Question

I am calling a controller action from a view like this:
<%= link_to "cancel offer", offermethod_offer_path,
class: "btn btn-medium btn-danger pull-right" %>
The controller action deletes a record (offer). I use the params[:id] tag from the page to identify the record in the controller like this:
class OffersController < ApplicationController
def offermethod
Offer.find(params[:id]).destroy
end
.
end
However, I would like to pass an additional parameter to the offermethod. Can I pass an instance variable from the offer view, so the code would look something like
<%= link_to "cancel offer", offermethod_offer_path(#variable.id),
class: "btn btn-medium btn-danger pull-right" %>
and in the controller
def offermethod(variable)
Offer.find(variable).destroy
end
I have tried to do this but I can't pass the variable/id parameter. Get the error like 'cannot find offer with nil id'.
Can you help me with the correct way to pass the variable to the controller like this? Many thanks!

Answer 1

Yes, you can. However, you need to name the variable, as GET params are key/value pairs.
<%= link_to "cancel offer", offermethod_offer_path(name: #variable.id), #...
A cleaner approach would be to just add a member route to your collection, like
resources :offers do
delete :offermethod, on: :member
end
This way, you can use a simple Offer.find params[:id], like #sircapsalot may wants to say.
edit:
I don't know, but I feel like you should read the rails guides, especially the parts about REST and the HTTP verbs. If you delete/destroy a resource, you should use a DELETE type http request, as I have described the route above. However, you also need to pass the desired method to your form or your link. For a link, this would be link_to 'name', path_to_object_delete_method(object), method: :delete. The same thing counts for a form.