如何在mongoose模式中验证字符串数组的最大长度？

const mongoose = require('mongoose');

const schema = new mongoose.Schema({
  names: {
    type: [String],
    validate: {
      validator: function(arr) {
        return arr.length <= 5; // 设置最大长度为5
      },
      message: '数组长度不能超过5'
    }
  }
});

const Model = mongoose.model('Model', schema);