rails异常（错误处理）

方法1：http://www.uedidea.com/rails%E9%94%99%E8%AF%AF%E5%A4%84%E7%90%86.html

def add_to_cart
product = Product.find(params[:id])
rescue ActiveRecord::RecordNotFound #拦截Product.find()异常
logger.error("Attempt to access invalid product #{params[:id]}") #日志记录
flash[:notice] = "Invalid product" #notice 存放提示信息
redirect_to :action => "index" #跳转到index
end

begin
   @user.destroy
    flash[:notice] = "User #{@user.name} deleted"
rescue Exception => e #如果上面的代码执行发生异常就捕获
   flash[:notice] = e.message
end

begin
  raise ArgumentError, "Bad data"
rescue => err
  puts err
ensure
...                       #执行清理工作
end

方法2：around_filter  

http://hlee.iteye.com/blog/323025

around_filter :rescue_record_not_found

def rescue_record_not_found
  begin
    yield
  rescue ActiveRecord::RecordNotFound
    render :file => "#{RAILS_ROOT}/public/404.html"
  end
end

 

   hlee 在文中还提到可以这样做：

rescue_from ActiveRecord::RecordNotFound, with => :rescue_record_not_found

def rescue_record_not_found
  render :file => "#{RAILS_ROOT}/public/404.html"
end

 

方法3：rescue_action_in_public



参考：http://202.199.224.30/post/article/7

def rescue_action_in_public(exception)
    logger.error("rescue_action_in_public executed")
    case exception
    when ActiveRecord::RecordNotFound, ::ActionController::RoutingError,
      ::ActionController::UnknownAction
      logger.error("404 displayed")
      render(:file  => "#{RAILS_ROOT}/public/404.html",
      :status   => "404 Not Found")
    else
      logger.error("500 displayed")
      render(:file  => "#{RAILS_ROOT}/public/500.html",
      :status   => "500 Error")
#      SystemNotifier.deliver_exception_notification(self, request,
#                                                    exception)
    end
  end

   注意：在不同环境中的配置，生产环境中，默认的配置应该就可以显示效果，但在开发模式下，需要确认/config/environments/development.rb中的



代码

config.action_controller.consider_all_requests_local = false

 
如果在本机访问必须增加（app/controllers/application.rb）：



代码

def local_request?
  false
end

 

错误类型参考：

DEFAULT_RESCUE_RESPONSE = :internal_server_error
DEFAULT_RESCUE_RESPONSES = {
  'ActionController::RoutingError'             => :not_found,
  'ActionController::UnknownAction'            => :not_found,
  'ActiveRecord::RecordNotFound'               => :not_found,
  'ActiveRecord::StaleObjectError'             => :conflict,
  'ActiveRecord::RecordInvalid'                => :unprocessable_entity,
  'ActiveRecord::RecordNotSaved'               => :unprocessable_entity,
  'ActionController::MethodNotAllowed'         => :method_not_allowed,
  'ActionController::NotImplemented'           => :not_implemented,
  'ActionController::InvalidAuthenticityToken' => :unprocessable_entity
}

DEFAULT_RESCUE_TEMPLATE = 'diagnostics'
DEFAULT_RESCUE_TEMPLATES = {
  'ActionView::MissingTemplate'       => 'missing_template',
  'ActionController::RoutingError'    => 'routing_error',
  'ActionController::UnknownAction'   => 'unknown_action',
  'ActionView::TemplateError'         => 'template_error'
}

 
参考网站：

　　http://runupwind.iteye.com/blog/1100925
　　http://www.uedidea.com/rails-erorr-handle.html
　　http://www.iteye.com/topic/708334