在Nest.js中，如何在装饰器中获取服务实例？

In Nest.js, how to get a service instance inside a decorator?(在Nest.js中，如何在装饰器中获取服务实例？)

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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