6

我需要使用 localStorage 来存储一些 Ember 对象。我注意到 Ember 对象具有名称如__ember1334992182483. 当我调用JSON.stringify()Ember 对象时,这些__ember*属性不会序列化。为什么是这样?我并不是说我想序列化这些属性。我只是好奇它们到底是什么以及它们是如何实现的,因此它们不会被序列化。

我正在使用cycle.js(https://github.com/douglascrockford/JSON-js/blob/master/cycle.js)将包含重复引用的数据结构编码为可用于重建原始数据的字符串结构。它可以让你这样做:

a = {a:1}
b = {b:1}
c = [[a, b], [b, a]]

foo = JSON.stringify(JSON.decycle(c))  // "[[{'a':1},{'b':1}],[{'$ref':'$[0][1]'},{'$ref':'$[0][0]'}]]"
JSON.retrocycle(JSON.parse(foo))  // reconstruct c

对于 Ember 对象,我可以做同样的事情,但我还需要将反序列化的对象传递给,Ember.Object.create()因为它们被反序列化为纯 JavaScript 对象。

这是序列化/反序列化 Ember 对象的最佳方法吗?有推荐的技术吗?

4

3 回答 3

8

对于序列化和反序列化,您可以执行以下操作,请参阅http://jsfiddle.net/pangratz666/NVpng/

App.Serializable = Ember.Mixin.create({
    serialize: function() {
        var propertyNames = this.get('propertyNames') || [];
        return this.getProperties(propertyNames);
    },

    deserialize: function(hash) {
        this.setProperties(hash);
    }
});

App.Person = Ember.Object.extend(App.Serializable, {
    propertyNames: 'firstName title fullName'.w(),
    fullName: function() {
        return '%@ %@'.fmt(this.get('title'), this.get('firstName'));
    }.property('firstName', 'title')
});

var hansi = App.Person.create({
    firstName: 'Hansi',
    title: 'Mr.'
});

// { firstName: 'hansi', title: 'Mr.', fullName: 'Mr. Hansi' }
console.log( hansi.serialize() );

var hubert = App.Person.create();
hubert.deserialize({
    firstName: 'Hubert',
    title: 'Mr.'
});
console.log( hubert.serialize() );​

更新:也看看类似的问题Ember model to json

于 2012-04-21T15:31:11.093 回答
0

我会使用 ember-data 并为此编写一个数据存储适配器。

于 2012-04-21T14:18:33.617 回答
0

我有:

  • 固定和简化的代码
  • 添加循环引用预防
  • 增加使用 get of value
  • 删除了空组件的所有默认属性

    //Modified by Shimon Doodkin 
    //Based on answers of: @leo, @pangratz, @kevin-pauli, @Klaus
    //http://stackoverflow.com/questions/8669340
    
    App.Jsonable = Em.Mixin.create({
        getJson : function (keysToSkip, visited) {
            //getJson() called with no arguments,
            // they are to pass on values during recursion.
    
            if (!keysToSkip)
                keysToSkip = Object.keys(Ember.Component.create());
    
            if (!visited)
                visited = [];
    
            visited.push(this);
    
            var getIsFunction;
    
            var jsonValue = function (attr, key, obj) {
                if (Em.isArray(attr))
                    return attr.map(jsonValue);
                if (App.Jsonable.detect(attr))
                    return attr.getJson(keysToSkip, visited);
                return getIsFunction?obj.get(key):attr;
            };
    
            var base;
            if (!Em.isNone(this.get('jsonProperties')))
                base = this.getProperties(this.get('jsonProperties'));
            else
                base = this;
    
            getIsFunction=Em.typeOf(base.get) === 'function';
    
            var json = {};
    
            var hasProp = Object.prototype.hasOwnProperty;
    
            for (var key in base) {
    
                if (!hasProp.call(base, key) || keysToSkip.indexOf(key) != -1)
                    continue;
    
                var value = base[key];
    
                // there are usual circular references
                // on keys: ownerView, controller, context === base
    
                if ( value === base ||
                     value === 'toString' ||
                     Em.typeOf(value) === 'function')
                    continue;
    
                // optional, works also without this,
                // the rule above if value === base covers the usual case
                if (visited.indexOf(value) != -1)
                    continue;
    
                json[key] = jsonValue(value, key, base);
    
            }
    
            visited.pop();
            return json;
        }
    });
    
    /*
    example:
    
    DeliveryInfoInput = Ember.Object.extend(App.Jsonable,{
     jsonProperties: ["title","value","name"], //Optionally specify properties for json
     title:"",
     value:"",
     input:false,
     textarea:false,
     size:22,
     rows:"",
     name:"",
     hint:""
    })
    */
    
于 2015-11-04T22:21:43.337 回答