使用猫鼬和nestJS自动增加字段

Posted 2023-03-11

【中文标题】使用猫鼬和nestJS自动增加字段

【英文标题】：Autoincrement of field with mongoose and nestJS

【发布时间】：2020-10-15 12:22:59

【问题描述】：

有人可以指导我如何在使用 mongoose 和 nestJS 框架时自动增加集合中的任何字段。

例如：假设我有这个用户架构

@Schema()
export class User extends Document 
    @Prop()
    userId: number;  // I want to increment this field on each new user
    
    @Prop()
    name: string;

    @Prop(
        type: String,
        required: true,
        unique: true,
    )
    email: string;

    @Prop()
    isEmailVerified: boolean;

    @Prop(
        type: String,
        required: true,
        unique: true,
    )
    mobile: string;

    @Prop()
    isMobileVerified: boolean;

    @Prop(
        type: String,
        required: true,
    )
    password: string;



export const UserSchema = SchemaFactory.createForClass(User);

我想在每个新用户上增加 userId。谢谢

【问题讨论】：

我猜这是重复的问题，请检查create-unique-autoincrement-field-with-mongoose

nestJs 的架构与 node.js 几乎没有什么不同。我已经尝试过这个东西，但我无法弄清楚，我如何在nestJS中应用同样的东西。

【参考方案1】：

Schema 装饰器有一个 SchemaOptions 类型的 options 参数：

@Schema( timestamps: true )

如果要重命名时间戳：

@Schema( timestamps: createdAt: 'created_at', updatedAt: 'updated_at' )

【参考方案2】：

编辑

因为您要求提供代码示例...我正在使用带有此库 ts-mongoose-pagination 的打字稿来管理卡片架构上的分页内容，顺便说一句，我正在使用 Nestjs

card.sceham.ts

import   Schema, Types  from 'mongoose';
import  CardTypesEnum  from '../utils/constants';
import  mongoosePagination  from "ts-mongoose-pagination";

const CardSchema = new Schema(
  isOriginal: Boolean,
  parentCard: type: Types.ObjectId, ref: 'Card',
  patientId: String,
  coverImage: String,
  title: String,
  content: String,
  createdBy: String,
  tags: [String],
  type: 
    type: String,
    default: CardTypesEnum.NORMAL,
    enum: Object.values(CardTypesEnum),
  ,
, 
  timestamps: true,
);


CardSchema.plugin(mongoosePagination);

export CardSchema;

app.module.ts

import  Module  from '@nestjs/common';
import  AppController  from './app.controller';
import  CardService  from './card.service';
import  ScheduleModule  from '@nestjs/schedule';
import  MongooseModule  from '@nestjs/mongoose';
import  CardSchema  from './schemas/card.shcema';
import * as config from 'config';

const DB_HOST = config.get('DB');


@Module(
  imports: [
    MongooseModule.forRoot(process.env.DB || DB_HOST, 
      useNewUrlParser: true,
      useUnifiedTopology: true,
    ),
    MongooseModule.forFeature([
      
        name: 'Card',
        schema: CardSchema,
      
    ]),
    ScheduleModule.forRoot()],
  controllers: [AppController],
  providers: [CardService],
)
export class AppModule 

card.service.ts

import  Injectable, Logger  from '@nestjs/common';
import  InjectModel  from '@nestjs/mongoose';
import  IPaginateResult, Model, PaginateModel  from 'mongoose';
import  CardsListFilterDto, CardDto  from './utils/dto/Cards.dto';
import  QueryOptionsDto  from './utils/dto/db.dto';

@Injectable()
export class CardService 
  private readonly logger = new Logger(CardService.name);
  constructor(
    // cardModel type is not Model but PaginateModel (so you can use the paginate method)
    @InjectModel('Card') private readonly cardModel: PaginateModel<any>,
  ) 
  async getCardLists(cardsListFilterDto: CardsListFilterDto): Promise<IPaginateResult<any>> 
    const optionsDto: QueryOptionsDto = 
       page: parseInt(cardsListFilterDto.page),
       perPage: parseInt(cardsListFilterDto.perPage),
       sort: '_id': -1
    ;
    const where = 
      createdBy: cardsListFilterDto.createdBy,
      isOriginal: true,
    ;
    // you can have paginate method by adding the plugin to schema
    return await this.cardModel.paginate(where, optionsDto)
  

希望这能解决您的问题

【讨论】：

是的，我知道插件，我只是想了解这些插件在 Nest js 中的实现。你能给我一些代码示例吗？

@SiddharthChandra 我已经编辑了完整 Nestjs 示例的答案，看看

我了解如何应用带有模式的插件。如果插件需要数据库连接对象怎么办？自动增量插件需要数据库连接才能工作。