NestJS custom decorator returns undefined

问题

Good morning,

I'm trying to create a custom decorator: user.decorator.ts

import { createParamDecorator, ExecutionContext } from '@nestjs/common';

export const User = createParamDecorator(
  (data: string, ctx: ExecutionContext) => {
    const request = ctx.switchToHttp().getRequest();
    const user = request.user;

    return data ? user && user[data] : user;
  },
);

user.entity.ts

import { Entity, PrimaryGeneratedColumn, Column, BeforeInsert } from "typeorm";
import * as bcrypt from 'bcryptjs';
import * as jwt from 'jsonwebtoken';
import { UserRO } from "./user.dto";

@Entity("user")
export class UserEntity {

    @PrimaryGeneratedColumn('uuid')
    id: string;

    @Column({
        type: 'varchar',
        length: 50,
        unique: true,
    })
    username: string;

    @Column('text')
    password: string;

    @Column('text')
    role: string;

    (...)
}

And finally, user.controller.ts (only the useful part):

(...)
    @Post('login')
    @UsePipes(new ValidationPipe())
    login(@Body() data: UserDTO,  @User('role') role: string) {
        console.log(`hello ${role}`);
        return this.userService.login(data);
(...)
    }

My problem: console.log(...) returns me hello undefined, when the expected response should be hello admin (as admin is the role of the user in the database)

EDIT: I also tried to console.log(user) in my decorator and it is undefined too.

EDIT2: My HttpErrorFilter also says: Cannot read property 'role' of undefined

I followed closely the documentation and I can't figure out where the problem is (https://docs.nestjs.com/custom-decorators).

Thank you for your time.

回答1:

I found a solution.

In user.decorator.ts:

Change const user = request.user; with const user = request.body;

According to nestjs's doc, it should be .user but when I looked deeper into the request, I noticed there were no 'user' but a 'body' with all in the informations. (https://docs.nestjs.com/custom-decorators)

Can't tell if I messed up earlier or if the doc is just outdated.

Problem solved whatsoever !

EDIT: 2nd solution:

I forgot to use @UseGuards(new AuthGuard()) on top, and the request.user is created with the AuthGuard..

回答2:

I have also been confused about this. I upgraded to NestJS 7, and following the migration guide was trying to update my user decorator.

The part I could not get working is const request = ctx.switchToHttp().getRequest();. For some reason getRequest() was returning undefined.

What worked for me is:

import { createParamDecorator, ExecutionContext } from '@nestjs/common';

export const CurrentUser = createParamDecorator(
  (data: unknown, ctx: ExecutionContext) => {
    return ctx.getArgByIndex(2).req.user;
  }
);

The execution context docs advise against getArgByIndex(), so I'm sure I'm doing something simple wrong. Interested in what the other answers and comments will say.

回答3:

I was getting mad with this empty/undefined request. Because that info in documentation (custom-decorators) was not working for me. I'm using graphql + typescript. Then the solution that did the magic was this:

export const CurrentUser = createParamDecorator(
    (data: unknown, context: ExecutionContext) => {
        const ctx = GqlExecutionContext.create(context);
        return ctx.getContext().req.user;
    },
);

来源：https://stackoverflow.com/questions/60753807/nestjs-custom-decorator-returns-undefined

标签

typescript

nestjs

typeorm