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nestjs module is not injected properly(未正确注入nestjs模块)

转载 作者:bug小助手 更新时间:2023-10-28 09:40:00 24 4
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I created new module in nest using the command nest g module UserModule

我使用Nest g模块UserModule命令在Nest中创建了新模块


src/user-module/user.resolver.ts is -

SRC/USER-MODULE/USER.RESOVER.TS为-


import { Query, Resolver } from '@nestjs/graphql';
import { UserService } from './user.service';

export class UserResolver {

constructor (private readonly user: UserService) {
this.user = user;
}

@Query('users')
async users() {
return this.user.getUsers();
}
}

then src/user-module/user-module.module.ts is -

则src/用户模块/用户模块.模块.ts是-


import { Module } from '@nestjs/common';
import { UserResolver } from './user.resolver';
import { UserService } from './user.service';
import { PrismaService } from './prisma.services';

@Module({
providers: [UserResolver, UserService, PrismaService]
})

export class UserModuleModule {}

the file src/user-module/user.service.ts -

文件src/用户模块/user.service.ts-


import { Injectable } from "@nestjs/common";
import { PrismaService } from "./prisma.services";
import { User } from "src/graphql";

@Injectable()
export class UserService {
constructor(private readonly prisma: PrismaService) {

}

async getUsers(): Promise<User[]> {
return this.prisma.prismaUsers.findMany({})
}
}

the src/user-module/prisma.services.ts -

Src/USER-MODULE/prisma.services.ts-


import { Injectable, OnModuleInit } from '@nestjs/common';
import { PrismaClient } from '@prisma/client';

@Injectable()
export class PrismaService extends PrismaClient implements OnModuleInit {
async onModuleInit() {
await this.$connect();
}
}


I started the service with npm start. I queried the service using below command -

我用NPM Start启动了这项服务。我使用以下命令查询了该服务-


query {
users {
id
name
email
}
}

graphql error


I get the below error -

我得到以下错误-



[Nest] 24682 - 09/09/2023, 10:59:34 AM ERROR [ExceptionsHandler] Cannot read properties of undefined (reading'getUsers')
TypeError: Cannot read properties of undefined (reading 'getUsers')
at UserResolver.users (/home/raj/Coding/ts/prisma-gql-express-demo/src/user-module/user.resolver.ts:12:22)
at /home/raj/Coding/ts/prisma-gql-express-demo/node_modules/@nestjs/core/helpers/external-context-creator.js:69:29
at InterceptorsConsumer.intercept (/home/raj/Coding/ts/prisma-gql-express-demo/node_modules/@nestjs/core/interceptors/interceptors-consumer.js:12:20)
at target (/home/raj/Coding/ts/prisma-gql-express-demo/node_modules/@nestjs/core/helpers/external-context-creator.js:74:60)
at Object.users (/home/raj/Coding/ts/prisma-gql-express-demo/node_modules/@nestjs/core/helpers/external-proxy.js:9:30)
at field.resolve (/home/raj/Coding/ts/prisma-gql-express-demo/node_modules/@apollo/server/src/utils/schemaInstrumentation.ts:82:22)
at executeField (/home/raj/Coding/ts/prisma-gql-express-demo/node_modules/graphql/execution/execute.js:492:20)
at executeFields (/home/raj/Coding/ts/prisma-gql-express-demo/node_modules/graphql/execution/execute.js:414:22)
at executeOperation (/home/raj/Coding/ts/prisma-gql-express-demo/node_modules/graphql/execution/execute.js:344:14)
at execute (/home/raj/Coding/ts/prisma-gql-express-demo/node_modules/graphql/execution/execute.js:136:20)



What is wrong with my injection and why it is not working ?
my complete code is here in github.
I seen this stackoverflow but my error seems to be due to different.

我的注射有什么问题,为什么不起作用?我的完整代码在GitHub中。我看到这个堆栈溢出,但我的错误似乎是由于不同。


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优秀答案推荐

Your UserResolver class needs to have @Resolver() decorating it, so that Nest knows it's a resolver and so Typescript knows to emit the type metadata in the constructor for the class. It's just like needing to add @Injectable() to a regular provider, it tells Typescript to emit the metadata

您的UserResolver类需要有@Resolver()来装饰它,以便Nest知道它是一个解析器,因此TypeScrip知道在类的构造函数中发出类型元数据。这就像需要将@Inputable()添加到常规提供程序中一样,它会告诉TypeScrip发出元数据


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