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spawn-object

v1.2.1

Published

辅助 TableStore 列操作的工具函数,能够将大对象拆分为仅包含单个属性对象的列表

Downloads

8

Readme

spawn-object

专用于 TableStore 列操作的工具函数,能够将大对象拆分为仅包含单个属性对象的列表

介绍

非常轻量的的一个工具函数,将以下形式的对象:

{
  name: 'mark',
  age: 19,
  isGood: true,
}

转化为以下形式:

[
  {
    name: 'mark',
  },

  {
    age: 19,
  },

  {
    isGood: true,
  },
]

使用说明

除了将大对象拆分为小对象数组外,本工具还提供了以下异常处理:

  • 如果属性值为对象(object)和数组(array),那么进行一次 JSON.stringify 转化。
  • 如果属性值为整数(integer),那么将其转化为 TableStore 能够识别的整数类型。
  • 如果属性值为空或其他 TableStore 不能处理的数据类型,自动过滤。

我们来模拟一个常见需求,用户编辑个人资料,提交后,需要将信息存起来,有些项目必填,有些选填,因此服务端需要判断是否为空(undefined 存入 TableStore 会报错)。

假设需要存入的对象属性如下:

const userInfo = {
  name: 'mark',
  age: 19,
  height: 170.5,
  idGood: true,
  tag: ['one', 'two', 'three'],
  extInfo: {
    nickname: 'good mark',
  },
}

如果不使用本工具,那么 attributeColumns 属性需要这么写:

attributeColumns: [
  {
    name: userInfo.name,
  },

  {
     age: TableStore.Long.fromNumber(userInfo.age),
  },

  {
     height: userInfo.height,
  },

  {
     idGood: userInfo.idGood,
  },

  {
     tag: JSON.stringify(userInfo.tag),
  },

  {
     extInfo: JSON.stringify(userInfo.extInfo),
  },
    ],

以上这种写法还是在不考虑值可能为空的情况下,实际上,TableStore 不允许存入 undefined,你需要过滤掉异常值,正常情况下,使用原生的写法,将会异常麻烦,以下是使用了本工具之后的写法:

首先引入

const spa = require('spawn-object')

属性列的写法:

attributeColumns: spa(userInfo)

使用场景

当前工具库仅用于阿里云(Aliyun)的表格存储(TableStore)的列(column)操作(可同时用于主键列和属性列),提供了一个更便捷的操作方式,在其他场景下可能并不适用。