module AjaxFieldUpdater
    module ClassMethods
        def ajax_updater_for(object, method, user_opts={})
            opts = {:render => lambda {|o| {:text => o.send(method)}}
                   }.merge(user_opts)
            define_method "update_#{object}_#{method}" do
                instance_variable_set("@#{object}", object.to_s.camelcase.constantize.find(params[:id]))
                o = instance_variable_get("@#{object}")
                if params[object][method]
                    o.send("#{method}=", params[object][method])
                    o.save
                end
                render opts[:render].call(o)
            end
        end
    end

    def self.included(c)
        c.extend ClassMethods
    end
end