类型“任务”不满足约束“文档”答案

【问题标题】：Type 'Task' does not satisfy the constraint 'Document'类型“任务”不满足约束“文档”
【发布时间】：2021-05-13 02:55:36
【问题描述】：

我正在使用 Nestjs 和 Mongodb 创建 API。 tasks.service.ts，试图创建一个 getAll 端点并得到打字稿错误： Type 'Task' does not satisfy the constraint 'Document'. Type 'Task' is missing the following properties from type 'Document': increment, model, $isDeleted, remove, and 51 more.

tasks.service.ts

import { Injectable, HttpStatus } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { Task } from './dto/task.inferface';

@Injectable()
export class TasksService {
  private readonly Tasks: Task[] = [];

  constructor(@InjectModel('Task') private readonly TaskModel: Model<Task>) {}

  async getAll(): Promise<Task> {
    const tasks = await this.TaskModel.find().exec();
    return tasks;
  }
}

【问题讨论】：

标签： mongodb typescript mongoose nestjs

【解决方案1】：

从接口扩展文档类。

import { Document } from 'mongoose';

export interface Task extends Document {
 //Task info ...
}

【讨论】：

【解决方案2】：

任务不应该是 DTO，它应该是这样的实体：

tasks.entity.ts

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

@Schema()
export class Task extends Document {
  @Prop()
  name: string;
}

export const TaskSchema = SchemaFactory.createForClass(Task);

您还需要在模块中注册该模型：

@Module({
  imports: [
    MongooseModule.forFeature([
      {
        name: Task.name,
        schema: TaskSchema,
      },
    ]),
  ],
})

所以你的代码会是这样的

import { Injectable, HttpStatus } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { Task } from './entities/task.entity';

@Injectable()
export class TasksService {
  constructor(@InjectModel(Task.name) private readonly TaskModel: Model<Task>) {}

  async getAll(): Promise<Task> {
    const tasks = await this.TaskModel.find().exec();
    return tasks;
  }
}

【讨论】：