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vue-data-model

v1.3.8

Published

A reactive state container system based on Vue, inspired by mobx-state-tree

Downloads

111

Readme

Introduction

一个类似mobx-state-tree的响应式状态容器系统(reactive state container system )。内部实现基于Vue,创建出来的对象是一个 vue 实例。这使得你在不熟悉 mobx-state-tree 的情况下,也能轻松上手,并且很容易在你现有的 vue 项目中使用。

Install

npm i vue-data-model

Example

codesandbox online

directory

Terminology

开始之前,让我们先统一一下术语。

type(类型)types.xxx() 方法创建的对象,它具备自我描述的特性,类似于 面向对象(oop)

state(状态) 一般通过 type(类型)create() 方法创建的类型实例对象。

How to use

step 1: 使用 types.vue 定义通用类型。该方法接受 vue 组件选项(vue component options)作为唯一参数。

import { types } from 'vue-data-model';
const Todo = types.vue({
  data() {
    return {
      name: '',
      isDone: false
    };
  },

  computed: {
    length() {
      return this.name.length;
    }
  },

  methods: {
    toggle() {
      this.isDone = !this.isDone;
    }
  }
});

step 2: 通过类型的 type.create() 创建类型实例。

/* 不传参数创建 */
const defaultTodo = Todo.create();

console.log(defaultTodo.name === ''); // true
console.log(defaultTodo.isDone === false); // true

defaultTodo.toggle();
console.log(defaultTodo.isDone === true); // true


/* 传默认值来创建 */
const initialData = {name: 'todo 1'};
const todoDefaultValue = Todo.create(initialData);

console.log(todoDefaultValue.name === 'todo 1'); // true
console.log(todoDefaultValue.isDone === false); // true

/* 基于vue的响应式状态容器系统 */
console.log(Todo.create() instanceof Vue) // true

与 1.1.x 不兼容的破坏性更新:

  1. types.vue 在定义时,将计算一次 date()来提取子节点类型,并缓存起来。这意味着 data()将同步执行一次。 例如:
const Parent = types.vue({
  data() {
    return {
      name: 'parent',
      child: Child, // 这里访问不到Child,需要将Child的定义提升到Parent之前,或者使用types.late(() => Child)
    };
  },
});

const Child = types.vue({
  data() {
    return {
      name: 'child',
    };
  },
});
  1. model 的类型节点不再支持 null/undefined 来初始化,这意味着它们是初始化的必填项。 例如:
// 接着上面的例子
Parent.create(); // will throw error
Parent.create({}); // will throw error

// correct
Parent.create({
  child: {},
});

// 或者Parent的child改为types.optional(Child, () => {})或types.maybe(Child)定义

API

types

汇聚类型创建相关方法:

  • types.vue(vueOptions) 基于一个 vue 组件定义创建一个类型。详看:如何使用。

  • types.vo(typeOrLiteral, vueOptions) 基于一个 vue 组件定义创建一个类型,类似于types.vue,用于创建 DDDValue Object。唯一区别types.vo不需要接受 data 定义,内部将实际的值放在 value 字段下,并重载了$toValue方法。

    typeOrLiteral: Value Object 的默认值或者类型。

    vueOptions: vue 组件选项。

const Email = types.vo('', {
  computed: {
    length() {
      return this.value.length;
    },
    isVaild() {
      return /@gmail.com$/.test(this.value);
    },
  },
});

const VM = types.vue({
  data() {
    return {
      email: Email,
    };
  },
});

const vm = VM.create({
  email: '[email protected]'
});

console.log(vm.email.value); // '[email protected]'
console.log(vm.email.isVaild); // true
console.log(vm.$toValue()); // {email: '[email protected]'}
  • types.literal(value) 定义一个字面量类型,与 types.union 配合时很有用。参考于 mobx-state-tree
const L1 = types.literal(1);

console.log(L1.create(1) === 1);
console.log(L1.is(1) === true);

L1.create(); // will throw error, an equal value must be specified.
L1.create(2); // will throw error, an equal value must be specified.
  • types.union(types...) 定义一个联合类型。实际开发中也许会遇到这样的情况:一个值的类型可能是类型 A,也可能是类型 B。参考于 mobx-state-tree
const Man = types.vue({
  data() {
    return {
      name: '',
      gender: types.literal('men'),
    };
  },
});

const Woman = types.vue({
  data() {
    return {
      name: '',
      gender: types.literal('women'),
    };
  },
});

const Humam = types.union(Man, Woman);

const humam = Humam.create({
  gender: 'women',
  name: 'Lucie',
});

console.log(Humam.is(humam)); // true
console.log(Woman.is(humam)); // true
console.log(Man.is(humam)); // false
console.log(Man.is(humam)); // false
  • types.compose(types...) 组合多个类型成为一个新的类型。参考于 mobx-state-tree

const Man = types.vue({
  data() {
    return {
      name: '',
    };
  },
});

const Superpower = types.vue({
  data() {
    return {
      role: 'decent',
      energyValue: 10,
    };
  },
  computed: {
    alias() {
      return `A ${this.role} Hero: ${this.name}`
    }
  },
  methods: {
    lasing() {
      this.energyValue = this.energyValue - 1;
      // dosomething
    }
  }
});

const SuperMan = types.compose(Man, Superpower);

const hero = SuperMan.create({name: 'Jack'});

console.log(hero.alias); // `A decent Hero: Jack`;
console.log(SuperMan.is(hero)); // true
console.log(Man.is(hero)); // false. compose is not Class inheritance.
  • types.composeVo(types...) 组合多个类型成为一个新的 ValueObject 类型。跟 types.compose 的区别是,types.compose使用types.vue创建新类型,而types.composeVo使用types.vo

  • types.array(type) 定义数组类型。参考于 mobx-state-tree

const Todo = types.vue({
  data() {
    return {
      name: '',
    }
  },

  methods: {
    remove() {
      const arr = getParent(this);

      arr.splice(arr.indexOf(this), 1);
    }
  }
});

const TodoList = types.vue({
  data() {
    return {
      list: types.array(Todo)
    }
  }
});

const todoList = TodoList.create({
  list: [{name: 'get up'}]
});

console.log(todoList.$toValue());
/*
{
  list: [{name: "get up"}]
}
*/

todoList.list[0].remove();
todoList.list.push({name: 'go back to sleep'})
console.log('remove' in todoList.list[0]) // true

state

  • $toValue(replacer) 将 state 转成一个纯对象,只包含 data 域的内容。replacer 是 JSON.stringify(data, replacer) 的参数。
// 让我们基于 step 1 的Todo。
const todo = Todo.create({name: 'aa'});

console.log(todo.$toValue());
// {name: 'aa', isDone: false}
  • $assign(data, replacer = defaultReplacer) 安全的对 state 进行赋值。
// 让我们基于 step 1 的Todo。
const todo = Todo.create({name: 'aa'});

todo.$assign({
  name: 'bb',
  toggle: 'foo',
  boo: 'boo'
});

console.log(typeof todo.toggle === 'function'); // true
console.log('boo' in todo); // false

getParent

getParent(state, deep = 1) 获取当前state的父节点。deep表示往上查找的层级数,默认是 1。参考于 mobx-state-tree

// 让我们基于 types.array 的例子示范
import { types, getParent } from 'vue-data-model';
console.log(getParent(todoList.list[0], 1) === todoList.list); // true
console.log(getParent(todoList.list[0], 2) === todoList); // true