update

# File railties/lib/rails/generators/rails/scaffold_controller/templates/controller.rb, line 58
  def update
    @<% singular_table_name %> = <% orm_class.find(class_name, "params[:id]") %>

    respond_to do |format|
      if @<%= orm_instance.update_attributes("params[:#{singular_table_name}]") %>
        format.html { redirect_to(@<% singular_table_name %>, :notice => '<%= human_name %> was successfully updated.') }
        format.xml  { head :ok }
      else
        format.html { render :action => "edit" }
        format.xml  { render :xml => @<% orm_instance.errors %>, :status => :unprocessable_entity }
      end