grails - Grails Controller 中使用动态mixins进行异常处理

Question

由于DRY原因，我在Grails 2.3.11 Controller according to this proposal on SO上使用了动态mixins:

class SomeApiController {
    def SomeApiController() {
        SomeApiController.mixin MyControllerMixin
    }
    ...

不幸的是，它不适用于异常处理程序，例如:

class MyControllerMixin {
    ...
    def businessException( BusinessException e ) {
        log.error( "API exception: ${e.message} ${e.errorCode}", e )
        def result = [
            status: 'Failure',
            errorCode: e.errorCode.name()
        ]
        response.status = 400
        render result as JSON
    }
    ...
}

在这种情况下，从某处抛出SomeApiController时，将调用BusinessException中的默认异常处理程序。但是，如果我将处理程序直接放置在 Controller 中，则效果很好，但这显然是我要避免的。

是否有任何解决方法也可以使它正常工作？

Answer 1

参见http://grails.org/doc/latest/guide/theWebLayer.html#controllerExceptionHandling。包括以下内容...

Exception handler methods must be present at compile time. Specifically, exception handler methods which are runtime metaprogrammed onto a controller class are not supported.