不能將KO映射擴展到多個屬性

Question

KO初學者：在搜索結果模塊的以下實現中，我使用映射插件將searchData JSON數組映射到我的視圖模型。 我還創建了兩個額外的屬性來顯示某些數據的受控版本：

define('searchresults', ['ko', 'lodash', 'datacontext', 'moment'], function (ko, _, datacontext, moment) {

    var get = function (term) {
        amplify.request("appsearch", { 'searchterm': term }, function (searchData) {

            var viewModel = {};

            var mapping = {
                'untilNow' : {
                    create: function (options) {
                        var innerModel = ko.mapping.fromJS(options.data);
                        innerModel.untilNow = moment(innerModel.lastSentDate()).fromNow();
                        return innerModel;
                    }
                },
                'iconClass': {
                    create: function (options) {
                        var innerModel = ko.mapping.fromJS(options.data);
                        innerModel.iconClass = "icon-" + innerModel.type();
                        return innerModel;
                    }
                }
            };

            viewModel.searchResults = ko.mapping.fromJS(searchData, mapping.untilNow);
            ko.applyBindings(viewModel);
        });
    };
    return {
        get: get
    };
});

調用此命令是為了填充以下模板：

<div id="contacts" class="view animated fadeInLeft">

    <h3>Search results for {{#routeData}}{{term}}{{/routeData}}</h3>
    <ul data-bind="template: { name: 'searchresults-template', foreach: searchResults }"></ul>

</div>

<script type="text/html" id="searchresults-template">

    <!--<li data-bind="attr: {'class': iconClass}">-->
    <li>
        <h4><span data-bind="text: type"></span></h4>
        <p><b>When created:</b> <span data-bind="text: untilNow"></span></p>
        <p><b>By:</b> <span data-bind="text: createdBy"></span></p>        
        <p><b>Company:</b> <span data-bind="text: company"></span></p>
        <hr/>
    </li>

</script>

<script>
    require(['searchresults'], function (searchresults) {
        var searchTerm = "{{#routeData}}{{term}}{{/routeData}}";
        searchresults.get(searchTerm);
    });
</script>

我不明白的是：

• 為什么在mapping.untilNow我不能只使用映射，因為KO顯然只希望{}。 因此，由於iconClass變得未定義，因此我無法使用它。
• 我在做錯什么，我必須重復innerModel實現。 我如何才能從KO樣式屬性中抽象出來！
• 另外，我還發現我不得不將ko.mapping分配給viewModel.searchResults，而不只是viewModel，這是我可以讓mt模板進行迭代的唯一方式，這有點麻煩。

我不了解KO的一些基本方面嗎？ 這是獲取數據並將其應用於模板並添加一些方法來操縱其一部分的正確方法嗎？

謝謝一大堆

searchData的樣本流：

[
    {
        "type": "Campaign",
        "lastSentDate": "/Date(634873003155215782)/",
        "createdBy": "Stephen Parker",
        "company": "Virgin Media"
    },
    {
        "type": "Person",
        "lastSentDate": "/Date(1198908717056-0700)/",
        "createdBy": "John Smith",
        "company": "Concep LTD"
    },
    {
        "type": "Campaign",
        "lastSentDate": "\/Date(1239018869048)\/",
        "createdBy": "Stephen Parker",
        "company": "Virgin Media"
    },
    {
        "type": "Company",
        "lastSentDate": "/Date(1198908717056-0700)/",
        "createdBy": "Stephen Parker",
        "company": "Virgin Media"
    }
]

Answer 1

define('searchresults', ['ko', 'lodash', 'datacontext', 'moment'], function (ko, _, datacontext, moment) {

    var get = function (term) {
        amplify.request("appsearch", { 'searchterm': term }, function (searchData) {

            var resultsItem = function (data) {
                var self = this;
                self.id = ko.observable(data.id);
                self.type = ko.observable(data.type);
                self.lastSentDate = ko.observable(data.lastSentDate);
                self.createdBy = ko.observable(data.createdBy);
                self.company = ko.observable(data.company);
                self.untilNow = ko.computed(function () {
                    return moment(self.lastSentDate()).fromNow();
                });
                self.iconClass = ko.computed(function() {
                    return "icon-" + self.type().toLowerCase();
                });
            };

            var dataMappingOptions = {
                key: function(data) {
                    return data.id;
                },
                create: function (options) {
                    return new resultsItem(options.data);
                }
            };

            var viewModel = {
                searchResults: ko.mapping.fromJS([])                
            };

            ko.mapping.fromJS(searchData, dataMappingOptions, viewModel.searchResults);
            ko.applyBindings(viewModel);
        });
    };
    return {
        get: get
    };
});