本文介绍了在Nest.js中，如何在装饰器中获取服务实例？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
CustomDecorator中，如何访问Nest.js中定义的服务实例？
export const CustomDecorator = (): MethodDecorator => {
return (
target: Object,
propertyKey: string | symbol,
descriptor: PropertyDescriptor
) => {
// Here, is possibile to access a Nest.js service (i.e. TestService) instance?
return descriptor;
}
};
推荐答案
聚会迟到了，但因为我遇到了类似的问题(Use global nest module in decorator)，偶然发现了这个问题。
import { Inject } from '@nestjs/common';
export function yourDecorator() {
const injectYourService = Inject(YourServiceClass);
return (target: any, propertyKey: string, propertyDescriptor: PropertyDescriptor) => {
// this is equivalent to have a constructor like constructor(yourservice: YourServiceClass)
// note that this will injected to the instance, while your decorator runs for the class constructor
injectYourService(target, 'yourservice');
// do something in you decorator
// we use a ref here so we can type it
const yourservice: YourServiceClass = this.yourservice;
yourservice.someMethod(someParam);
};
}
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