Polymer 聚合物dom重复过滤器未捕获类型错误

在执行我的代码（使用dom repeat、filter和observe）时，我得到以下错误：

Uncaught TypeError: Cannot read property 'apply' of undefined  VM8037 polymer-mini.html:2057
   _filterFn @ VM8038 polymer.html:4147
    (anonymous function) @ VM8038 polymer.html:4282
    Polymer._applyFullRefresh @ VM8038 polymer.html:4281
    Polymer._render @ VM8038 polymer.html:4231
    Debouncer.complete @ VM8037 polymer-mini.html:2095
    boundComplete @ VM8037 polymer-mini.html:2074
    Polymer.Async._atEndOfMicrotask @ VM8037 polymer-mini.html:2051
    window.MutationObserver.observe.characterData @ VM8037 polymer-mini.html:2066

如果我从

中删除属性“filter”和“observe”，则“dom repeat”可以正常工作，否则“dom repeat”将失败，并且菜单项不会呈现

index.html代码：

...
<template is="dom-bind" id="app">
   ...
    <template id="tmenu" is="dom-repeat" items="{{content.sections}}"
          filter="dataFilters.showUnpublished" observe="item.published">
        <paper-button raised class="top-nav">
            <a data-route="{{item.route}}" href="{{baseUrl}}{{item.route}}">
                <span>{{item.menu}}</span>
           </a>
       </paper-button>
   </template>
</template>
...

...
app.dataFilters = {
    // called by the templates that "renders" the top and the drawer menus.
    showUnpublished: function(item) {
        console.log(item);
        if (app.sysVars.granted && app.sysVars.signedIn) {
            console.log(true);
            return true;
        }
        console.log(false);
        return item.published; //item.published is a boolean
    }
};
app.content = { project: {}, sections: [] };
window.addEventListener('gapiLoaded', function() {
    ...
    // prior code retrieves the content from the server 
    // and injects it using the following 2 lines:
    app.set('content.sections', resp.sections);
    app.set('content.project', resp.project);
    ...
)};
...

该错误是否表示存在聚合物缺陷

我做错什么了吗

---

干杯

您是否尝试了

observe=“published”

而不是

observe=“item.published”

？我找到了问题的根源。我将尽快发布我发现的内容。：）@山姆，你找到解决办法了吗？