Active record Dynamic

Hi,

A really simple question I suppose but very busy for me:

How to cast my params[:id] (through or not a temp variable) in an
activeRecord?

"class DatatableController < ApplicationController
  def DTTable
    temp===params[:id]
    @records=temp.find_all()
    @fieldnames=Tablefield.find(:all,:conditions =>
"tablename='patient'")
    render :action => 'DTTable.rxml', :layout => false
  end
end"

Thanks a lot