Nest.js中的GraphQL端点返回空对象
我正在使用Nest.js和Sequelize Typescript构建一个GraphQL API 当我调用delete和update时,我得到了一个null对象,但是操作完成了。我需要放置{nullable:true},因为我得到一个错误,说Nest.js中的GraphQL端点返回空对象,graphql,nestjs,sequelize-typescript,Graphql,Nestjs,Sequelize Typescript,我正在使用Nest.js和Sequelize Typescript构建一个GraphQL API 当我调用delete和update时,我得到了一个null对象,但是操作完成了。我需要放置{nullable:true},因为我得到一个错误,说不能为非null字段返回null。我怎么修理它?我需要端点返回更新的对象,以便在前面显示信息 book.dto.ts book.resolver.ts 从'@nestjs/graphql'导入{Args,Mutation,Query,Resolver};
不能为非null字段返回null
。我怎么修理它?我需要端点返回更新的对象,以便在前面显示信息
book.dto.ts
book.resolver.ts
从'@nestjs/graphql'导入{Args,Mutation,Query,Resolver};
从“./model/Book.entity”导入{Book};
从“./dto/book.dto”导入{BookType};
从“./input/createBook.input”导入{CreateBookInput};
从“./input/updateBook.input”导入{UpdateBookInput};
从“/book.service”导入{BookService};
@解析程序('Book')
导出类图书解析程序{
构造函数(私有只读bookService:bookService){}
@查询(()=>[BookType])
异步getAll():承诺{
return等待这个。bookService.findAll();
}
@查询(()=>BookType)
异步getOne(@Args('id')id:number){
返回等待此。bookService.find(id);
}
@突变(()=>BookType)
异步createItem(@Args('input')输入:CreateBookInput):承诺{
const book=新书();
book.author=input.author;
book.title=input.title;
返回等待此。bookService。创建(book);
}
@突变(()=>BookType)
异步更新项(
@Args('input')输入:UpdateBookInput):承诺{
返回等待此.bookService.update(输入);
}
@突变(()=>BookType)
异步删除项(@Args('id')id:number){
返回等待此.bookService.delete(id);
}
@查询(()=>字符串)
异步hello(){
返回“你好”;
}
}
图书服务
从'@nestjs/common'导入{Inject,Injectable};
从'@nestjs/typeorm'导入{InjectRepository};
从“./model/Book.entity”导入{Book};
从“typeorm”导入{DeleteResult,InsertResult,Repository,UpdateResult};
@可注射()
出口类图书服务{
构造函数(@Inject('BOOKS_REPOSITORY')私有只读bookRepository:typeof Book){}
承诺{
返回此.bookRepository.findAll();
}
发现(id):承诺{
返回this.bookRepository.findOne({where:{id}});
}
创建(数据):承诺{
返回data.save();
}
更新(数据):承诺{
返回this.bookRepository.update(数据,{where:{id:data.id}});
}
删除(id):承诺{
返回this.bookRepository.destroy({where:{id}});
}
}
为什么要从删除中返回这些字段?你的前端一定已经有了它们。。。你可以根据它是否有效,将该突变的返回类型更改为真或假。。。在更新中,如果您使用postgres,您可以进行变异并在选项中添加returning:true。。。如果没有,则不返回更新结果,执行更新并返回findOne或findById的结果(以适用者为准)您可以在解析器查询中修复它设置选项参数
@Query(() => BookType, { nullable: true })
import {Args, Mutation, Query, Resolver} from '@nestjs/graphql';
import { Book } from './model/book.entity';
import { BookType } from './dto/book.dto';
import { CreateBookInput } from './input/createBook.input';
import { UpdateBookInput } from './input/updateBook.input';
import { BookService } from './book.service';
@Resolver('Book')
export class BookResolver {
constructor(private readonly bookService: BookService) {}
@Query(() => [BookType])
async getAll(): Promise<BookType[]> {
return await this.bookService.findAll();
}
@Query(() => BookType)
async getOne(@Args('id') id: number) {
return await this.bookService.find(id);
}
@Mutation(() => BookType)
async createItem(@Args('input') input: CreateBookInput): Promise<Book> {
const book = new Book();
book.author = input.author;
book.title = input.title;
return await this.bookService.create(book);
}
@Mutation(() => BookType)
async updateItem(
@Args('input') input: UpdateBookInput): Promise<[number, Book[]]> {
return await this.bookService.update(input);
}
@Mutation(() => BookType)
async deleteItem(@Args('id') id: number) {
return await this.bookService.delete(id);
}
@Query(() => String)
async hello() {
return 'hello';
}
}
import {Inject, Injectable} from '@nestjs/common';
import {InjectRepository} from '@nestjs/typeorm';
import {Book} from './model/book.entity';
import {DeleteResult, InsertResult, Repository, UpdateResult} from 'typeorm';
@Injectable()
export class BookService {
constructor(@Inject('BOOKS_REPOSITORY') private readonly bookRepository: typeof Book) {}
findAll(): Promise<Book[]> {
return this.bookRepository.findAll<Book>();
}
find(id): Promise<Book> {
return this.bookRepository.findOne({where: {id}});
}
create(data): Promise<Book> {
return data.save();
}
update(data): Promise<[number, Book[]]> {
return this.bookRepository.update<Book>(data, { where: {id: data.id} });
}
delete(id): Promise<number> {
return this.bookRepository.destroy({where: {id}});
}
}
@Query(() => BookType, { nullable: true })