我一直在努力使用Sproutcore 2.0来解决一对多关系中的绑定问题。
我的模板看起来像这样:
<script type="text/x-handlebars">
{{#collection contentBinding="HTH.projectsController.content"}}
<h3>{{content.title}}</h3>
{{#collection contentBinding="content.tasks"}}
<span>{{content.title}}</span>
{{/collection}}
{{/collection}}
</script>
虽然实际代码如下:
HTH.Project = SC.Record.extend({
title: SC.Record.attr(String),
tasks: SC.Record.toMany('HTH.Task',{
isMaster: YES,
inverse: 'project'
})
});
HTH.Task = SC.Record.extend({
title: SC.Record.attr(String),
project: SC.Record.toOne('HTH.Project', {
isMaster: NO
})
});
HTH.Project.FIXTURES = [ { guid: 1, title: 'Send man to moon', tasks: [1,2]},
{ guid: 2, title: 'Master handstand', tasks: [3]}];
HTH.Task.FIXTURES = [ { guid: 1, title: 'Find rocket', project: 1},
{ guid: 2, title: 'Find fuel', project: 1},
{ guid: 3, title: 'Stand on hands', project: 2}];
HTH.store = SC.Store.create().from(SC.Record.fixtures);
// Controllers
HTH.projectsController = SC.ArrayProxy.create({
content: HTH.store.find(HTH.Project)
});
现在我可以更新任务,这些将更新UI。例如:
HTH.store.find(HTH.Project).get('firstObject').set('title','Updated the title!');
但是,如果我创建一个新项目并动态添加任务,UI将添加新项目,但从不添加任何优惠:
var project = HTH.store.createRecord(HTH.Project, {title: "New" });
var task = HTH.store.createRecord(HTH.Task, {title: "New task" });
project.get('tasks').pushObject(task);
我确信这取决于没有按预期工作的绑定,或者需要遵守的属性。有人可以帮忙吗?
注意:在SproutCore 2.0成为Ember.js之前,已经提出了这个问题。它还引用了SproutCore 1.x数据存储的非官方端口,该端口已被官方支持的ember-data库取代。
答案 0 :(得分:1)
为了使记录可用,它必须是assigned an ID。
这意味着:
var project = HTH.store.createRecord(HTH.Project, {title: "New" });
var task = HTH.store.createRecord(HTH.Task, {title: "New task" });
project.get('tasks').pushObject(task);
变为:
var project = HTH.store.createRecord(HTH.Project, {title: "New" }, 123);
var task = HTH.store.createRecord(HTH.Task, {title: "New task" }, 321);
project.get('tasks').pushObject(task);
然后,更改将反映在用户界面
中