在NestJs项目中使用i18n库翻译类验证错误消息

问题描述

import {
  Catch,HttpException,ExceptionFilter,ArgumentsHost,} from "@nestjs/common";
import { Response } from "express";
import { ResponseError } from "../common/dto/ResponseDto";
import { I18nService } from "nestjs-i18n";


@Catch(HttpException)
export class ExceptionResponseFilter implements ExceptionFilter {

  constructor(
    private readonly _i18n: I18nService
) {}
async msg_validation(msg_key: string): Promise<string> {
    const validation = await this._i18n.translate(
        "translations.validation_messages."+msg_key,{
            lang: "en",}
    );
    return validation;
   }

  catch(exception: HttpException,host: ArgumentsHost) {
    const ctx = host.switchToHttp();
    const response = ctx.getResponse<Response>();
    const status = exception.getStatus();
    const r = <any>exception.getResponse();

    let message: string;
    if (exception.message) {
      console.log(r);
      message = typeof r.message == "string" ? r.message : this.msg_validation(r.message[0]);
    } else {
      message = `UnkNown error occured!`;
    }
    response.status(status).send(new ResponseError(message,null,status));
  }
}

这是错误处理部分，我正尝试通过i18N Translations数组翻译错误消息

这是dto部分

@IsNotEmpty({message: "IsNotEmpty"})
    @Apiproperty()
    readonly firstName: string;

这是翻译json字符串

{
    "keywords": {
        "admin": "Administrator"
    },"validation_messages": {
            "Isstring": "Should be a String","IsNotEmpty": "Should not be Empty","IsUnique": "Already Exists","MaxLength": "Should not be Greater than","MinLength": "Should not be Less than","IsNumberString": "Should not Contain Alphabets or Special Characters","IsPhoneNumber": "Should be a Valid Phone Number","IsAlpha": "SHould not Contain Numbers or Special Symbols","IsEmail": "Should be a Valid Emial Format"
        }
    
}

在这种特殊情况下，我在控制台中返回的消息与我传递的密钥相同 “ IsNotEmpty”

我在做什么错

解决方法

NeverMind，我解决了。 实际上问题是我正在将异步函数msg_validation的值提供给同步函数， 我也使catch异步了，并在函数调用之前添加了一个wait方法，并且像一个符咒一样工作