这确实是一个意想不到的问题。
当我在终端上输入“ npm run start”时，出现错误。
[Nest] 40671 - 2018-10-20 17:46:37 [ExceptionHandler] Nest can't resolve dependencies of the USERRepository (?). Please make sure that the argument at index [0] is available in the current context. +22ms
Error: Nest can't resolve dependencies of the USERRepository (?). Please make sure that the argument at index [0] is available in the current context.
at Injector.lookupComponentInExports (/Users/huxiao/OneDrive/Coding/wtapm/node_modules/@nestjs/core/injector/injector.js:139:19)
at <anonymous>
at process._tickCallback (internal/process/next_tick.js:160:7)
at Function.Module.runMain (module.js:703:11)
at Object.<anonymous> (/Users/huxiao/OneDrive/Coding/wtapm/node_modules/ts-node/src/_bin.ts:177:12)
at Module._compile (module.js:660:30)
at Object.Module._extensions..js (module.js:671:10)
at Module.load (module.js:573:32)
at tryModuleLoad (module.js:513:12)
at Function.Module._load (module.js:505:3)
1: node::Abort() [/usr/local/bin/node]
2: node::Chdir(v8::FunctionCallbackInfo<v8::Value> const&) [/usr/local/bin/node]
3: v8::internal::FunctionCallbackArguments::Call(void (*)(v8::FunctionCallbackInfo<v8::Value> const&)) [/usr/local/bin/node]
4: v8::internal::MaybeHandle<v8::internal::Object> v8::internal::(anonymous namespace)::HandleApiCallHelper<false>(v8::internal::Isolate*, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::FunctionTemplateInfo>, v8::internal::Handle<v8::internal::Object>, v8::internal::BuiltinArguments) [/usr/local/bin/node]
5: v8::internal::Builtin_Impl_HandleApiCall(v8::internal::BuiltinArguments, v8::internal::Isolate*) [/usr/local/bin/node]
6: 0x909046042fd
Abort trap: 6
我尽了一切努力，但解决不了。我的代码如下：
下面是[app.module.ts]
import { Module } from '@nestjs/common';
import { AppController } from './app.controller';
import { AppService } from './app.service';
import { UserModule } from './user/user.module';
import {TypeOrmModule} from '@nestjs/typeorm';
@Module({
imports: [TypeOrmModule.forRoot(
{
"type":"postgres",
"name":"pm_main",
"host": "localhost",
"port": 5432,
"username": "postgres",
"password": "test",
"database": "test",
"synchronize":true
}
),UserModule],
controllers: [AppController],
providers: [AppService]
})
export class AppModule {}
以下是[user.service.ts]
import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { USER } from './models/user.model';
import { Repository } from 'typeorm';
@Injectable()
export class UserService {
constructor(
@InjectRepository(USER)
private readonly userRepository: Repository<USER>
){}
async findAllUser(): Promise<USER[]> {
return await this.userRepository.find();
}
}
下面是[user.module.ts]
import { Module } from '@nestjs/common';
import { UserController } from './user.controller';
import { UserService } from './user.service';
import { PROJECT } from 'project/models/project.model';
import { TypeOrmModule } from '@nestjs/typeorm';
import { USER } from './models/user.model';
@Module({
imports: [TypeOrmModule.forFeature([USER])],
providers: [UserService],
controllers: [UserController],
exports: [UserService]
})
export class UserModule {}
我100％遵循了文档的样本，但这似乎不正确。
有关更多信息，package.json中的依赖项如下：
"dependencies": {
"@nestjs/common": "^5.3.9"
"@nestjs/core": "^5.3.10",
"@nestjs/typeorm": "^5.2.0",
"ajv": "^6.5.4",
"class-validator": "^0.9.1",
"fastify-formbody": "^2.0.0",
"jsonwebtoken": "^8.3.0",
"passport": "^0.4.0",
"passport-jwt": "^4.0.0",
"pg": "^7.4.3",
"reflect-metadata": "^0.1.12",
"rxjs": "^6.0.0",
"typeorm": "^0.2.7",
"typescript": "^2.6.2"
还以[USER.model.ts]身份显示为USER
import { Entity, PrimaryGeneratedColumn, Column, CreateDateColumn, UpdateDateColumn, ManyToMany, JoinTable } from "typeorm";
import { IsNotEmpty, IsDate, IsEmail, IsArray, IsEnum, IsJSON } from 'class-validator'
import { user_Gender, user_Status } from "./user.enum";
import { PROJECT } from 'project/models/project.model';
@Entity()
export class USER {
@PrimaryGeneratedColumn('uuid')
id:string;
@Column({unique:true})
@IsNotEmpty()
username:string;
@Column()
password:string;
@Column()
@IsEnum({user_Gender})
gender:string;
@Column("jsonb")
@IsJSON()
realname?:{
firstName:string;
lastName:string;
middleName:string;
};
@Column()
@IsDate()
birthday?:Date;
@CreateDateColumn()
createAt:Date;
@UpdateDateColumn()
updateAt:Date;
@Column()
@IsArray()
industry?:string[];
@Column()
@IsEmail()
email?:string;
@Column()
@IsArray()
org?:string[];
@Column()
current_org?:string;
@Column("jsonb")
@IsJSON()
user_location?:{
country:string;
province_or_state:string;
city:string;
district:string;
address:string;
};
@Column("jsonb")
@IsJSON()
mobilephone?:{code:string,number:string};
@Column("text")
avater:string;
@Column()
@IsArray()
receive_account?:[{
name:string,
number:string,
bank:string,
swiftCode?:string,
address?:string}]
@Column()
@IsDate()
last_loginAt?:Date;
@Column()
@IsEnum(user_Status)
status:string;
@Column()
projectsId:[];
@ManyToMany(type => PROJECT, project => project.members)
@JoinTable()
projects:PROJECT[];
}
答案 0 :(得分：5)
问题是您要在根导入中为数据库分配名称：
imports: [TypeOrmModule.forRoot({
"type":"postgres",
"name":"pm_main",
^^^^^^^^^^^^^^^^^
"host": "localhost",
"port": 5432,
"username": "postgres",
"password": "test",
"database": "test",
"synchronize":true
}
但是您在forFeature导入中不要使用相同的名称：
imports: [TypeOrmModule.forFeature([USER])],
a）因此，可以将名称添加到forFeature导入中：
TypeOrmModule.forFeature([USER], 'pm_main')
b）或从"name":"pm_main",导入中删除forRoot。如果只有一个数据库，则只能依靠隐式默认名称。
答案 1 :(得分：0)
希望获得帮助。
import { UserEntity } from './user.entity';
import { TypeOrmModule } from '@nestjs/typeorm';
const module = await Test.createTestingModule({
controllers: [UsersController],
providers: [UsersService],
imports: [TypeOrmModule.forRoot(), TypeOrmModule.forFeature([UserEntity])], // <== This line
}).compile();
答案 2 :(得分：0)
当使用多个数据库时，Kim的解决方案不能完全解决问题。
在解决此问题时最终解决。 https://github.com/nestjs/typeorm/issues/105
也就是说，@ InjectRepositry（Model，connectionName）时也需要指定连接名称