yunrui_asset/backend/models/DeviceBusiness.js

const { DataTypes } = require('sequelize');
const { sequelize } = require('../db');
const Device = require('./Device');
const Business = require('./Business');

const DeviceBusiness = sequelize.define(
  'DeviceBusiness',
  {
    id: {
      type: DataTypes.INTEGER,
      primaryKey: true,
      autoIncrement: true,
    },
    deviceId: {
      type: DataTypes.STRING,
      allowNull: false,
      references: {
        model: Device,
        key: 'deviceId',
      },
    },
    businessId: {
      type: DataTypes.STRING,
      allowNull: false,
      references: {
        model: Business,
        key: 'businessId',
      },
    },
    isPrimary: {
      type: DataTypes.BOOLEAN,
      defaultValue: false,
    },
  },
  {
    tableName: 'device_business',
    timestamps: true,
    indexes: [
      { fields: ['deviceId'] },
      { fields: ['businessId'] },
      { unique: true, fields: ['deviceId', 'businessId'] },
    ],
  }
);

Device.belongsToMany(Business, {
  through: DeviceBusiness,
  foreignKey: 'deviceId',
  otherKey: 'businessId',
});

Business.belongsToMany(Device, {
  through: DeviceBusiness,
  foreignKey: 'businessId',
  otherKey: 'deviceId',
});

DeviceBusiness.belongsTo(Business, { foreignKey: 'businessId' });
DeviceBusiness.belongsTo(Device, { foreignKey: 'deviceId' });

module.exports = DeviceBusiness;