Set a object property from GET parameter

[Nabor Erices]

Hi,

I need to call a new/edit autogenerated action, passing a param in the route, and save that param in the object (therefore in the database).

Can I do it only through config or I need to extend the new/edit controllers? If the later, wich function do i need to replace/extend, and how can a i get the param from the route?

Thanks in advance.