如何在 NestJS 的控制器路由中获取配置? [英] How to get config in controller route of NestJS?

问题描述

我试图让一个变量通过装饰器的控制器 prefix 和方法 path 参数出现.我知道 Nest Router，但我宁愿尽可能避免使用它.

I'm trying to get a variable to appear through both the controller prefix and the method path parameters of the decorators. I know of Nest Router, but I'd rather avoid using it while I can.

/*************************
* eneity.config.ts
*************************/
import { registerAs } from '@nestjs/config';
export default registerAs('cat', () => ({
        cat: {
            urlPrefix: 'cat',
            paramName: 'meow',
        }
    })
);
/*************************
* cat.module.ts
*************************/
import entityConfig                    from 'config/entity.config';
import { CatController }               from 'entities/cat/cat.controller';
import { ConfigModule, ConfigService } from '@nestjs/config';
@Module({
            imports    : [ConfigModule.forFeature(entityConfig),],
            providers  : [ConfigService],
            controllers: [CatController],
        })
export class CatModule {}

/*************************
* cat.controller.ts
*************************/

import { Controller, Request, Get } from '@nestjs/common';
import { ConfigService }            from '@nestjs/config';

@Controller(`${this.urlPrefix}/cat`) // <<<<< Here
export class CatController {
    private readonly urlPrefix;
    private readonly paramName;

    constructor(
        private readonly configService: ConfigService,
    ) {
        this.urlPrefix = this.configService.get<string>('cat.urlPrefix'); // animal
        this.paramName = this.configService.get<string>('cat.paramName'); // meow
    }

    @Get(`snowflake/:${this.paramName}`) // <<<<< Here
    getProfile(@Request() req) {
        return 'meowww';
    }
}

我尝试照原样执行，但它一直给我未定义"，即使我将它记录到构造函数中的控制台时也会显示.我希望能够使用配置来设置这些常量.

I tried to do it as is, and it keeps giving me "undefined", even though it shows up if I log it to console in the constructor. I want to be able to use the configuration to set these constants.

最后我想要的路线是:localhost/animal/cat/snowflake/meow.

In the end, the route I want is: localhost/animal/cat/snowflake/meow.

我用一个普通变量尝试过，它有效.显然问题出在我对 NestJS 配置包的实现上.

I attempted it with a normal variable, and it works. Apparently the issue is with my implementation of NestJS's config package.

推荐答案

您的配置服务没有问题，而是装饰器在 Typescript/JavaScript 中的工作方式有问题.由于装饰器上下文的工作方式，装饰器无法访问类成员.如果您想让端点可配置，这首先看起来是个坏主意，您可以使用 nest-router 正如你提到的.

There's not an issue with your config service, but rather an issue with how decorators work in Typescript/JavaScript. Decorators cannot access class members, due to how the decorator context works. If you want to make the endpoint configurable, which seems like a bad idea in the first place, you can use nest-router as you mentioned.

这篇关于如何在 NestJS 的控制器路由中获取配置?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！