Sequelize V5->V6 升级：Typescript 错误属性 'x' 在类型 'y' 上不存在答案

【问题标题】：Sequelize V5->V6 upgrade: Typescript Error Property 'x' does not exist on type 'y'Sequelize V5->V6 升级：Typescript 错误属性 'x' 在类型 'y' 上不存在
【发布时间】：2020-12-17 10:40:23
【问题描述】：

我将从 sequelize 5.x.x 升级到 6.x.x。在 sequelize v5 中一切正常，但是当我升级时，当我想使用包含中的对象时，通过关联生成的所有属性都会出现打字稿错误。我还尝试了https://sequelize.org/master/manual/typescript.html 中的示例，但没有成功。

希望有人能帮帮我！！

型号： Participant.js

import { Model, DataTypes } from 'sequelize';
import { STATUS } from '@bb/shared-core/dist/constants/participant';

import sequelize from '@bb/db';
import User from '@bb/components/erp/v1/modules/users/models/User';
import OrderItem from '@bb/components/ecommerce/v2/modules/orders/models/OrderItem';
import Contact from '@bb/components/erp/v1/modules/contacts/models/Contact';

import { DeserializedModel } from '../interfaces/Participant';

export class Participant extends Model implements DeserializedModel {
  id!: number;
  fkUser: number;
  fkOrderItem: number;
  fkContact: number;
  adminNotes: string;
  trainerNotes: string;
  attendance: string;
  status: string;
  readonly createdAt: Date;
  readonly updatedAt: Date;
}

Participant.init({
  fkUser: {
    type: DataTypes.NUMBER,
    field: 'fk_user'
  },
  fkOrderItem: {
    type: DataTypes.NUMBER,
    field: 'fk_order_item'
  },
  fkContact: {
    type: DataTypes.NUMBER,
    field: 'fk_contact'
  },
  trainerNotes: {
    type: DataTypes.STRING,
    field: 'trainer_notes'
  },
  adminNotes: {
    type: DataTypes.STRING,
    field: 'admin_notes'
  },
  attendance: {
    type: DataTypes.ENUM('confirmed', 'unconfirmed'),
    field: 'attendance'
  },
  status: {
    type: DataTypes.ENUM(STATUS.REBOOKED, STATUS.CANCELLED, STATUS.PARTICIPATING),
    field: 'status',
    defaultValue: 'participating'
  }
}, {
  sequelize,
  modelName: 'participant'
});

Participant.belongsTo(User, {
  as: 'user',
  foreignKey: 'fk_user',
  targetKey: 'id'
});

Participant.belongsTo(OrderItem, {
  as: 'orderItem',
  foreignKey: 'fk_order_item',
  targetKey: 'id'
});

OrderItem.hasMany(Participant, {
  as: 'participants',
  foreignKey: 'fk_order_item',
  sourceKey: 'id'
});

Participant.belongsTo(Contact, {
  as: 'contact',
  foreignKey: 'fk_contact',
  targetKey: 'id'
});

if (process.env.NODE_ENV === 'test') {
  Participant.sync();
}

export default Participant;

这是使用该模型的函数： ParticipantService.js

  private async getEventIdFromParticipant(participantId: number): Promise<number|undefined> {
    const participant = await Participant.findOne({
      where: {
        id: participantId,
      },
      include: [
        {
          model: OrderItem,
          as: 'orderItem',
        }
      ]
    });

    return participant?.orderItem?.fkEvent;
  }

错误在返回语句中的ParticipantService.js中。

Property 'orderItem' does not exist on type 'Participant'

【问题讨论】：

标签： javascript node.js typescript sequelize.js

【解决方案1】：

你也需要在类中定义它：

import { Model, DataTypes, BelongsTo } from 'sequelize';

export class Participant extends Model implements DeserializedModel {
  id!: number;
  fkUser: number;
  fkOrderItem: number;
  fkContact: number;
  adminNotes: string;
  trainerNotes: string;
  attendance: string;
  status: string;
  public readonly orderItem?: OrderItem;
  public static associations: {
    orderItem: BelongsTo<Participant, OrderItem>;
  };
  readonly createdAt: Date;
  readonly updatedAt: Date;
}

【讨论】：