问序列化与WHERE IN的关系("ARRAY")

EN

const User = sequelize.define('User', {
    categories: DataTypes.ARRAY(DataTypes.INTEGER)
}, {
    instanceMethods: {
        getCategories: function(){
            return Category.findAll({
                where: {
                    id: { $in: this.get('categories') }
                }
            }).then(categories => {
                // if user's categories was [1, 2, 4]
                // it would return categories with id=1, id=2 and id=4
                return categories;
            });
        },
        setCategories: function(ids){
            return this.setDataValues('categories', ids).save().then(self => {
                return self;
            });
        }
    }
});

var Sequelize = require('sequelize');
var Op = Sequelize.Op;
var arrayofTaskId = ['123', '456', '789'];
Tasks.findAll({
  where: {
    task_id: {
      [Op.in]: arrayofTaskId
    }
  }
}).then(function(result) {
  return res.json(result)
});