Question

此文件定义Document对象的保存/查找方法并将其导出：

商品/ document.js

import Parse from 'parse'
import _ from 'lodash'

Parse.initialize('APP_ID', 'CLIENT_ID')

const Document = {}
const ParseDocument = Parse.Object.extend('Document')

Document.save = (json) => {
  const document = new ParseDocument()
  return document.save(json)
}

Document.find = () => {
  const query = new Parse.Query(ParseDocument)
  return query.find().then((results) =>
    _.map(results, (result) =>
      result.toJSON()
    )
  )
}

export default Document

此文件使用导出的方法：

视图/ documents.js

submit () {
  const document = {
    title: this.title,
    content: this.content
  }
  Document.save(document).then(() =>
    Document.find().then((result) => /* DO STUFF */)
  )
}

如果我只有一个对象，这很好。问题是，我有很多。例如，我也有一个Section对象。

如果我遵循这种模式，我将不得不这样做：

商品/ section.js

import Parse from 'parse'
import _ from 'lodash'

Parse.initialize('APP_ID', 'CLIENT_ID')

const Section = {}

...

Section.save = (json) => {
  const section = new ParseSection()
  return section.save(json)
}

我该怎么做呢，所以我只需要编写一次save和find方法，然后使用它们，例如Document.save和Section.save？

Answer 1

一种方法是为每个实体（Parse.Object的子类）创建一个facade对象：

商品/ document.js

'use strict' const ParseFacade = require('./parse-facade') const Document = new ParseFacade('Document') module.exports = Document

商品/ section.js

'use strict' const ParseFacade = require('./parse-facade') const Section = new ParseFacade('Section') module.exports = Section

<强>解析-facade.js

'use strict' const Parse = require('parse') const _ = require('lodash') Parse.initialize('APP_ID', 'CLIENT_ID') function ParseFacade (className) { this.ParseObject = Parse.Object.extend(className) } ParseFacade.prototype.save = function save (json) { const PO = this.ParseObject const document = new PO() return document.save(json) } ParseFacade.prototype.find = function find () { const PO = this.ParseObject const query = new Parse.Query(PO) return query.find().then((results) => _.map(results, (result) => result.toJSON())) } module.exports = ParseFacade

要向给定实体添加功能，请照常添加属性：

Document.doSomething = function doSomething (...args) { // this.ParseObject refers to the subclassed Parse.Object // ... }

如何在不同的JavaScript / Parse对象之间共享方法？

1 个答案: