Nest.js/Mongoose：为什么我的预保存钩子无法触发？答案

【问题标题】：Nest.js/Mongoose: Why is my pre save hook failing to be triggered?Nest.js/Mongoose：为什么我的预保存钩子无法触发？
【发布时间】：2020-10-14 15:32:48
【问题描述】：

我刚开始使用 Nest.js，到目前为止一切顺利。但是，我遇到了一个问题，即我的用户模式中的猫鼬预保存钩子没有被触发。这应该很简单，但无论出于何种原因，密码都以纯格式而不是散列形式保存。什么给了？

还有一个小问题 - 在使用 @Prop 装饰器时，如何定义引用另一个模式的字段？ profile 字段应该是 mongoose.schema.types.objectid 在没有装饰器的情况下，它只是 profile: { type: mongoose.Schema.Types.ObjectId, ref: 'Profile' }。

以下是相关的sn-ps。

用户架构

import { Prop, Schema, SchemaFactory } from '@nestjs/mongoose';
import { Document } from 'mongoose';

@Schema({
  timestamps: true,
})
export class User extends Document {
  @Prop({ required: true })
  fullname: string;

  @Prop({ required: true, unique: true })
  username: string;

  @Prop({ required: true, unique: true, lowercase: true })
  email: string;

  @Prop({ required: true })
  password: string;

  @Prop({ required: true, ref: 'Profile' })
  profile: string

  @Prop({ required: true, enum: ['admin', 'basic' ]})
  role: string
}

export const UserSchema = SchemaFactory.createForClass(User);

用户模块

import { Module } from '@nestjs/common';
import { MongooseModule } from '@nestjs/mongoose';
import * as bcrypt from 'bcrypt';

import { User, UserSchema } from './user.model';
import { UsersController } from './users.controller';
import { UsersService } from './users.service';

@Module({
  imports: [
    MongooseModule.forFeatureAsync([
      {
        name: User.name,
        useFactory: () => {
          const schema = UserSchema;

          schema.pre<User>('save', async function (next: Function) {
            const user = this;

            const salt = await bcrypt.genSalt(10);
            const hashedPassword = await bcrypt.hash(user.password, salt);

            user.password = hashedPassword;

            next();
          });

          schema.methods.comparePasswords = async function (submittedPassword) {
            const user = this;

            await bcrypt.compare(submittedPassword, user.password);
          };

          return schema;
        },
      },
    ]),
  ],
  controllers: [UsersController],
  providers: [UsersService],
})
export class UsersModule {}

用户服务

import { Injectable, HttpException, HttpStatus } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { JwtService } from '@nestjs/jwt';

import { UsersService } from '../users/users.service';
import { ProfilesService } from '../profiles/profiles.service';
import { User } from '../users/user.model';

@Injectable()
export class AuthService {
  constructor(
    @InjectModel(User.name) private readonly userModel: Model<User>,
    private usersService: UsersService,
    private profilesService: ProfilesService,
    private jwtService: JwtService
  ) {}

  async signup(signupData): Promise<any> {
    const foundUser = await this.userModel.findOne({ email: signupData.email });

    if (foundUser) {
      throw new HttpException(
        'Email is already in use',
        HttpStatus.BAD_REQUEST
      );
    }

    const createdProfile = await this.profilesService.createProfile();

    const createdUser = await this.userModel.create({
      ...signupData,
      profile: createdProfile._id,
      role: 'basic',
    });

    const createdUserCopy = { ...createdUser.toObject() };

    delete createdUserCopy.password;
    delete createdUserCopy.__v;

    const payload = {
      username: createdUser.username,
      sub: createdUser._id,
    };

    return {
      user: createdUserCopy,
      token: this.jwtService.sign(payload),
    };
  }
}

【问题讨论】：

标签： typescript mongoose nestjs

【解决方案1】：

您不能将async 与next() 结合使用

schema.pre<User>('save', function (next) {
  const user = this;
  console.log(user)
  next();
});

应该工作

【讨论】：

【解决方案2】：

我知道这个问题很久以前就被问过了，但是对于再次面临这个问题的人来说，这里是如何解决它。

useFactory: () => {
          const schema = UserSchema;

          schema.pre<User>('save', async function () {
            const user = this;

            const salt = await bcrypt.genSalt(10);
            const hashPassword = await bcrypt.hash(user.password, salt);

            user.salt = salt;
            user.password = hashPassword;
          });
          return schema;
        }

您可以使用返回承诺的函数，而不是手动调用 next()。特别是，您可以使用 async/await。

【讨论】：