Nestjs中的MissingSchemaError

Posted 2023-03-11

【中文标题】Nestjs中的MissingSchemaError

【英文标题】：MissingSchemaError in Nestjs

【发布时间】：2022-01-10 09:21:21

【问题描述】：

大家好，我无法指定与另一个模型的关系。当我添加一个关系时，它向我显示了这个错误

图书模型

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

export type BookDocument = Book & Document;
@Schema( timestamps: true, collection: 'books' )
export class Book 
  @Prop( type: String, required: true )
  name: string;

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

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


export const BooksSchema = SchemaFactory.createForClass(Book);

图书借阅模式

import  Prop, Schema, SchemaFactory  from '@nestjs/mongoose';
import  Schema as mongooseSchema, Document  from 'mongoose';
import  Book  from '../../books/enitiy/book.model';
import  IsNotEmpty  from 'class-validator';

export type BookLendDocument = BookLend & Document;

@Schema( timestamps: true )
export class BookLend 
  @IsNotEmpty()
  @Prop( type: mongooseSchema.Types.ObjectId, ref: 'books', required: true )
  bookId: Book;

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

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

  @Prop( type: String )
  returnedOn: string;

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


export const BookLendSchema = SchemaFactory.createForClass(BookLend);

我将书籍 objectID 引用到 booklend booksID ，当我使用下面的代码时，我收到错误 MissingSchemaError: Schema hasn't been registered for model "books".

 const allBookLendDetails = await this.bookLend
      .find()
      .populate('bookId')
      .exec();

【参考方案1】：

嗨，我通过将BooksSchema 导入BookLend 模块文件来修复它 这里参考代码：-

import  Module  from '@nestjs/common';
import  BookLendService  from './book-lend.service';
import  BookLendController  from './book-lend.controller';
import  MongooseModule  from '@nestjs/mongoose';
import  BookLendSchema  from './entities/book-lend.entity';
import  CommonService  from '../common-service/common-service.service';
import  BooksSchema  from '../books/enitiy/book.model';

@Module(
  imports: [
    MongooseModule.forFeature([
       name: 'booklend', schema: BookLendSchema ,
       name: 'books', schema: BooksSchema ,
    ]),
  ],
  controllers: [BookLendController],
  providers: [BookLendService, CommonService],
)
export class BookLendModule 

在服务文件中，需要注入模型

  constructor(
    @InjectModel('booklend') private readonly bookLend: Model<BookLend>,
    @InjectModel('books') private readonly books: Model<Book>
  )