Old ConfigTemplateController#update:


def update
  @config_template = ConfigTemplate.find(params[:id])
    respond_to do |format|
      if @config_template.update_attributes(params[:config_template])
        format.html do
          notice "Successfully updated config template."
          redirect_to config_templates_url
        end
        format.json {render :json => @config_template, :status => :ok}
      else
        format.html {render :action => 'edit'}
        format.json {render :json => @config_template.errors, :status => :unprocessable_entity}
      end
    end
end


New ConfigTemplateController#update:

def update
    @config_template = ConfigTemplate.find(params[:id])
    if @config_template.update_attributes(params[:config_template])
      process_success @config_template, "Successfully updated config template.", config_templates_url
    else
      process_error @config_template, :render =>"edit"
    end
end



New methods in application_controller:


  def process_success object, success_msg, success_redirect, json_code = :ok
    respond_to do |format|
        format.html do
          notice success_msg
          redirect_to success_redirect
        end
        format.json { render :json => object, :status => json_code}
    end
  end

  def process_error object, hash
    hash[:json_code] ||= :unprocessable_entity
    respond_to do |format|
        format.html do
            error hash[:error_msg] if hash[:error_msg]
            render :action => hash[:render] if hash[:render]
            redirect_to hash[:redirect] if hash[:redirect]
        end
        format.json { render :json => object.errors, :status => hash[:json_code]}
    end
  end