找不到元数据.可能安装了不止一个类验证程序版本.您需要使依赖关系变平

Question

当我运行这个命令curl -vd '{"NickName":"Marry","Password":"pwd"}' -H "Content-type: application/json" http://127.0.0.1:3000/signin时，我得到No metadata found. There is more than once class-validator version installed probably. You need to flatten your dependencies.打印在服务器端，而validate未正确执行。在此之前，我npm install一些依赖项：

npm install --save routing-controllers
npm install --save class-transformer
npm install --save class-validator

有人能帮忙吗？我该怎么解决这个问题？谢谢

import { Entity, Column, PrimaryGeneratedColumn, CreateDateColumn, UpdateDateColumn } from 'typeorm';
import { Length } from 'class-validator';
import * as ErrorCode from '../error/errorcode'
@Entity()
export class User {
@PrimaryGeneratedColumn()
@Column({
name: "id"
})
Id?: number;
@Column({
name: "nickname"
})
@Length(1, 20, {
message: "NickName must be 1 to 20 characters",
context: {
errorCode: ErrorCode.ParamLengthNotInRange
}
})
Nickname: string;
@Column({
name: "password"
})
@Length(6,20)
Password: string;
//constructor(input : { Id : number , Nickname: string, Password: string}){
constructor(input : { Nickname: string, Password: string}){
//this.Id = input.Id;
this.Nickname = input.Nickname;
this.Password = input.Password;
}
}

import { JsonController, Post, Body, Req } from "routing-controllers";
import { validate, ValidationError } from 'class-validator';
import {User} from '../entity'
@JsonController()
export class UserController {
@Post('/signin')
async signin(@Body() user: User) {
const errors: ValidationError[] = await validate(user)
if (errors && errors.length > 0) {
console.log(errors[0].contexts!['Length'].errorCode)
}
console.log(user)
return 'this is signin'
}
}

Answer 1

您可以通过执行以下操作来检查是否安装了更多版本的class-validator

npm ls class-validator

在我的案例中，我使用了type-graphql，发现type-graphql也在安装class-validator的早期版本。所以我只是将package.json中的版本降级到早期版本，使它们匹配，然后重新安装，消息消失了。

希望这能有所帮助。

Answer 2

我们收到了同样的消息。class-validator从0.12.2更新到0.13.1解决了这个问题。