使用方法如下:
rescue_from(*klasses, &block)
它的第一个参数是出错的类型集合，可以指定多个错误类型或者出错信息，每一项都会调用klass.is_a?(klass);第二个参数是可以带一个block，我们可以使用with来指定:
出错处理是可以继承的，比如底下代码中，如果没有指定错误处理类型的话，就会调同rescue_from ‘MyAppError::Base’的出错处理；
ApplicationController:
1
2
3
4
5
6
7
8
9
10
| class ApplicationController < ActionController::Base
rescue_from ActiveRecord::InvalidForeignKey,ActiveRecord::StatementInvalid , :with => :show_fk_errors
rescue_from 'MyAppError::Base' do |exception|
render :xml => exception, :status => 500
end
protected
def show_fk_errors(exception)
render :template => "/errors/fk_error.html.erb",:object=>@exception = exception
end
end
|
现在的项目这么写的。捕获Rails 404 error ，跳转到/public/404.html
application_controller:
1
2
3
4
5
6
7
8
9
| rescue_from ActionController::UnknownFormat,
ActionController::RoutingError,
ActionController::UnknownController,
ActiveRecord::RecordNotFound,
with: :render_not_found
def render_not_found
redirect_to not_found_url
end
|
routes.rb:
1
| get 'not_found' => 'home#not_found'
|
home_controller:
1
2
3
4
5
6
| def not_found
respond_to do |format|
format.html { render file: "#{Rails.root}/public/404.html", layout: false, status: 404}
format.all { render :nothing => true, :status => status }
end
end
|
action_controller:
1
| return redirect_to not_found_path unless @product
|