类型为脚本-@FieldResolver的graphql在编译为js类型的graphql中不工作

我是graphql类型的新手，我有一个奇怪的问题，就是字段解析程序不工作

我使用的是一堆：

• 打字稿（3.9.5）
• 类型graphql（1.0.0）
• 字体（0.2.25）
• 阿波罗（2.16.0）

每当我运行我的typescript（使用ts节点）时，一切都很好，但是当我将编译后的js版本与express一起使用时，查询只对简单的db字段起作用，但FieldResolver根本不起作用，最后我得到“对于不可为null的字段不能返回null”。 有趣的是，字段解析器是同一@Resolver类中查询解析器的兄弟。查询会被激发（放置在控制台日志中），但字段解析程序从不这样做。有人有线索吗

以下是代码中的一些片段：

@Entity()
@ObjectType()
export class Member extends BaseEntity {
  @Field(() => ID)
  @PrimaryGeneratedColumn()
  id: string;

  @UseForSearch()
  @UseAsTitle()
  @Field(() => String)
  @IsEmail()
  @Column({ type: 'varchar', unique: true })
  email: string;

  @Field(() => [Item])
  @OneToMany(type => Item, item => item.member)
  items?: Item[];

  @OneToMany(type => Review, review => review.member)
  reviews?: Review[];

  @Field(() => Number)
  itemsCount: number;
}

---

编译步骤（TS到JS）有一个问题-如果它不发出ES6类和箭头函数，它会将

of=>Member

视为原型函数，因此它会认为它是对象类型类。

问题不在于编译。问题在于你的数据

您看到的消息是，对于不可为null的字段成员，

不能返回null。ItemScont

那么，要么在itemsCount中添加一个值，要么将该字段标记为可空。问题是，在呼叫会员计数之前，您错过了等待

只需添加等待

 @FieldResolver()
  async itemsCount(@Root() member: Member) {
    console.log('in itemsCount resolver');
    return await this.itemsRepository.count({ where: { memberId: member.id } });
  }

import { Resolver, Query, FieldResolver, Root, Ctx, Arg } from 'type-graphql';
import { getRepository, Repository } from 'typeorm';
import { Item } from '../entity';
import { Member } from '../entity/member';

@Resolver(of => Member)
export class MemberResolver {
  constructor(private itemsRepository: Repository<Item>) {
    this.itemsRepository = getRepository(Item);
  }

  @Query(() => [Member])
  members() {
    console.log('in members query');
    return Member.find();
  }

  @FieldResolver()
  async items(@Root() member: Member) {
    return await this.itemsRepository.find({ where: { memberId: member.id } });
  }

  @FieldResolver()
  async itemsCount(@Root() member: Member) {
    console.log('in itemsCount resolver');
    return this.itemsRepository.count({ where: { memberId: member.id } });
  }

query {
  members {
    email
    itemsCount
  }
}

{
  "errors": [
    {
      "message": "Cannot return null for non-nullable field Member.itemsCount.",
      "locations": [
        {
          "line": 4,
          "column": 5
        }
      ],
      "path": [
        "members",
        0,
        "itemsCount"
      ],
      "extensions": {
        "code": "INTERNAL_SERVER_ERROR",
        "exception": {
          "stacktrace": [
            "Error: Cannot return null for non-nullable field Member.itemsCount.",
            "    at completeValue (/Users/admin/tackar/clampa/clampa-server/node_modules/graphql/execution/execute.js:599:13)",
            "    at completeValueCatchingError (/Users/admin/tackar/clampa/clampa-server/node_modules/graphql/execution/execute.js:534:19)",
            "    at resolveField (/Users/admin/tackar/clampa/clampa-server/node_modules/graphql/execution/execute.js:465:10)",
            "    at executeFields (/Users/admin/tackar/clampa/clampa-server/node_modules/graphql/execution/execute.js:297:18)",
            "    at collectAndExecuteSubfields (/Users/admin/tackar/clampa/clampa-server/node_modules/graphql/execution/execute.js:752:10)",
            "    at completeObjectValue (/Users/admin/tackar/clampa/clampa-server/node_modules/graphql/execution/execute.js:742:10)",
            "    at completeValue (/Users/admin/tackar/clampa/clampa-server/node_modules/graphql/execution/execute.js:630:12)",
            "    at completeValue (/Users/admin/tackar/clampa/clampa-server/node_modules/graphql/execution/execute.js:596:21)",
            "    at completeValueCatchingError (/Users/admin/tackar/clampa/clampa-server/node_modules/graphql/execution/execute.js:534:19)",
            "    at /Users/admin/tackar/clampa/clampa-server/node_modules/graphql/execution/execute.js:655:25"
          ]
        }
      }
    }
  ],
  "data": null
}

 @FieldResolver()
  async itemsCount(@Root() member: Member) {
    console.log('in itemsCount resolver');
    return await this.itemsRepository.count({ where: { memberId: member.id } });
  }