Nestjs mongodb

• nestjs 文档
• mongoose 文档

使用"@meanie/mongoose-to-json"转换查询后返回的json数据

将"_id"转为"id"，并删除"__v"字段

import { Prop, Schema, SchemaFactory } from '@nestjs/mongoose';
import { Document } from 'mongoose';
import * as toJSON from '@meanie/mongoose-to-json';

export type CatDocument = Cat & Document;

@Schema()
export class Cat {
  @Prop()
  name: string;

  @Prop()
  age: number;

  @Prop()
  breed: string;
}

export const CatSchema = SchemaFactory.createForClass(Cat).plugin(toJSON);

全局使用

    MongooseModule.forRoot('mongodb://localhost/test', {
      connectionFactory: (connection) => {
        connection.plugin(require('@meanie/mongoose-to-json'));
        return connection;
      },
    }),

Prop

@Schema()
export class Cat {
  @Prop({ required: true })
  name: string;

  @Prop([Number])
  ages: number[];

  @Prop({ default: 'lll' })
  breed?: string;

  @Prop({ type: Date, default: Date.now })
  date?: Date;
}

this.catModel.insertMany([{ name: 'aaa', ages: [2, 1] }]);

这将返回:

[
    {
        "breed": "lll", 
        "ages": [
            2, 
            1
        ], 
        "name": "aaa", 
        "date": "2021-01-07T02:44:06.459Z", 
        "id": "5ff67576b9280e2aa0728ee8"
    }
]

如果你将date改为number类型，将返回时间戳(毫秒)

  @Prop({ type: Number, default: Date.now })
  date?: number;

链表

@Schema()
export class Breed {
  @Prop()
  breed: string;
}
export const BreedSchema = SchemaFactory.createForClass(Breed);


@Schema({versionKey: false})
export class Cat {
  @Prop({ required: true })
  name: string;

  @Prop({ type: mongoose.Schema.Types.ObjectId, ref: 'Breed' })
  breed: Breed;
}
export const CatSchema = SchemaFactory.createForClass(Cat);

增:

this.catModel.insertMany([
 {
        name: 'cat 1',
        breed: mongoose.Types.ObjectId('5ff67afda6c7062a2a97575f'),
 },
]);

查:

this.catModel.find().populate('breed');

如果一只猫含有多个品种

@Schema({ versionKey: false })
export class Cat {
  @Prop({ required: true })
  name: string;

  @Prop({ type: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Breed' }] })
  breed: Breed;
}

// data
{
  "_id" : ObjectId("5ff69a49c96ca7d6c68d1b26"),
  "name" : "cat 1",
  "breed" : ["5ff69995c96ca7d6c68d1b1d", "5ff699b9c96ca7d6c68d1b22"]
}

保存新数据:

    const newBreed = new this.breedModel({
      breed: 'bbbb',
    });

    newBreed.save();
    return this.catModel.insertMany([
      {
        name: 'cat 1',
        breed: newBreed._id,
      },
    ]);