如何在子模式Meteor js 1.8中声明simpleschema

meteor add aldeed:simple-schema

import { SimpleSchema } from 'meteor/aldeed:simple-schema';
import { Mongo } from 'meteor/mongo';

const PostSchema = new SimpleSchema({
  title: {
    type: String,
    label: 'Title',
    max: 100
  },
  content: {
    type: String,
    label: 'Content',
    max: 500
  },
  createdAt: {
    type: Date,
    label: 'Created At',
    autoValue: function() {
      if (this.isInsert) {
        return new Date();
      }
    }
  }
});

Posts = new Mongo.Collection('posts');
Posts.attachSchema(PostSchema);

const post = {
  title: 'Sample Post',
  content: 'This is a sample post content'
};

const isValid = PostSchema.validate(post);
if (isValid) {
  // 数据验证通过，可以进行插入操作
  Posts.insert(post);
} else {
  // 数据验证失败，处理错误
  console.log(PostSchema.validationErrors());
}