我正在使用nestjs,type-graphql和typeorm创建一个graphql api。我在查找如何执行特定查询时遇到麻烦。假设我有以下实体:
@Entity()
@ObjectType({ description: 'The user model' })
export class User extends BaseEntity {
@Field(type => ID)
@PrimaryGeneratedColumn('uuid')
readonly id: string;
@Field()
@Column()
@IsNotEmpty()
@IsEmail()
email: string;
@Field()
@IsNotEmpty()
@Column()
password: string;
@Field(type => [Project], { nullable: true })
@ManyToMany(type => Project)
@JoinTable()
projects?: Project[];
}
@Entity()
@ObjectType({ description: 'The project model' })
export class Project extends BaseEntity {
@Field(type => ID)
@PrimaryGeneratedColumn('uuid')
readonly id: string;
@Field()
@Column()
@IsNotEmpty()
description: string;
@Field(type => [User], { nullable: true })
@ManyToMany(type => User)
@JoinTable()
participants?: User[];
}
我有以下服务:
import { includes } from 'lodash';
@Injectable()
export class ProjectService {
constructor(
@InjectRepository(Project)
private projectRepository: Repository<Project>,
@InjectRepository(User)
private userRepository: Repository<User>,
) {}
async loadAllForUser(
userId: string
): Promise<Project[]> {
const projects = await this.projectRepository.find(
{
relations: ['participants'],
},
);
return projects.filter(project =>
includes(
project.participants.map(participant => participant.id),
userId,
),
);
}
}
这将是我的解析器:
@Resolver( of => Project)
export class ProjectResolver {
constructor(
private projectService: ProjectService,
private userService: UserService,
) {}
@Query(returns => [Project])
@UseGuards(GqlAuthGuard)
async myProjects(
@GqlUser() user: User,
) {
return await this.projectService.loadAllForUser(
user.id,
);
}
}
您可以在我的项目服务中看到,我只是使用find方法获取所有项目,然后再使用lodash中的include过滤此列表,以仅过滤出包含用户ID的项目。是否没有办法在项目存储库的find方法中添加某种操作(如“ where”或“ in”),以便我可以直接从那里进行过滤,而不是手动过滤和使用lodash中的include?我什至不知道这是否是我手动过滤方式的正确方法?
亲切的问候,
Gerry
答案 0 :(得分:0)
尝试使用TypeORM QueryBuilder并进行一些内部联接以筛选不属于所选用户的项目。