处理 Rails 的错误界面

1. 针对runtime error的通常处理

 

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  

 

 

2. 也可以这么处理

 

rescue_from ActiveRecord::RecordNotFound, with => :rescue_record_not_found   
  
def rescue_record_not_found   
  render :file => "#{RAILS_ROOT}/public/404.html"  
end  

 

 

3. 对于其他类型的错误，参考如下：

    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'
    }