Cannot read property 'belongsToMany'... - 인프런

db.Hashtag 가 왜 undefined로 나올까요 ㅠㅜ

에러메세지 입니다.

TypeError: Cannot read property 'belongsToMany' of undefined

at Function.Hashtag.associate (D:\005_Study\React\react-nodebird\prepare\back\models\hashtag.js:12:16)

at D:\005_Study\React\react-nodebird\prepare\back\models\index.js:19:19

at Array.forEach (<anonymous>)

at Object.<anonymous> (D:\005_Study\React\react-nodebird\prepare\back\models\index.js:17:17)

at Module._compile (internal/modules/cjs/loader.js:1138:30)

at Object.Module._extensions..js (internal/modules/cjs/loader.js:1158:10)

at Module.load (internal/modules/cjs/loader.js:986:32)

at Function.Module._load (internal/modules/cjs/loader.js:879:14)

at Module.require (internal/modules/cjs/loader.js:1026:19)

at require (internal/modules/cjs/helpers.js:72:18)

hashtag.js입니다.

module.exports = (sequelize, DataTypes) => {
  const Hashtag = sequelize.define('Hashtag', {
    name: {
      type: DataTypes.STRING(20),
      allowNull: false,
    },
  }, {
    charset: 'utf8mb4', // 이모티콘 넣으려면 mb4 넣어줘야한다.
    collate: 'utf8mb4_general_cli', // 한글 및 이모티콘 저장
  });
  Hashtag.associate = (db) => {
    db.Hashtag.belongsToMany(db.Post, { through: 'PostHashTag' });
  };
  return Hashtag;
}

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Cannot read property 'belongsToMany' of undefined