Sproutcore 嵌套数组一对多绑定(bind)

Question

我有三层对象，每一层都是一对多的。我想选择其他笔记本时，页面和列 View 元素会获得级联更新。

笔记本 > 页面 > 列

使用 notebooksController 和 notebookController 我可以绑定(bind)

App.Notebook = SC.Record.extend({
    name: SC.Record.attr(String),
    pages: SC.Record.toMany('App.Page', {isMaster: YES, inverse: 'notebook'})
});

App.Page = SC.Record.extend({
    pageNumber: SC.Record.attr(Number),
    notebook: SC.Record.toOne('App.Notebook', {isMaster: NO, inverse: 'pages'}),
    columns: SC.Record.toMany('App.Column', {isMaster: YES, inverse: 'page'})
});

App.Column = SC.Record.extend({
    columnNumber: SC.Record.attr(Number),
    page: SC.record.toOne('App.Page', {isMaster: NO, inverse: 'columns'})
});

在此之后，我似乎无法让 pagesController 的内容绑定(bind)工作。我希望 pagesController、pageController、columnsController 和 columnController 的内容被级联下来，这样当用户单击不同的笔记本时，呈现的 View 会自动切换到正确的内容。

ArrayController notebooksController
// contents filled from fixture
ObjectController notebookController
// bound to notebooksController selection
ArrayController pagesController
// contentBinding: 'notebookController.pages' does not work!
ObjectController pageController
// bound to pagesController selection
// and down to column

Answer 1

假设您有一个笔记本，请尝试

App.notebookController = SC.ObjectController.create({
    // call App.notebookController.set('content', aNotebook)
    // to set the content on this controller
});

App.pageController = SC.ArrayController.create({
    // the notebookController is a proxy to the its content, so you dont need 
    // 'content' in the binding contentBinding: 'App.notebookController.pages'

    // bind the list view to App.pagesController.arrangedObjects.  If you look in the code
    // arranged objects is a reference to the array controller itself, which has array methods
    // on it
});

App.pageSelectionController = SC.ObjectController.create({
    //  You need to add 
    // 
    //  selectionBinding: 'App.pageSelectionController.content
    //
    //  to the collection view where you select the page

    // you can do this in places to see when things change.  This controller is just a proxy
    // to the selected page. 
    selectionDidChange: function(){
        console.log('page selection changed to [%@]'.fmt(this.get('content');
    }.observes('content')
});

App.columnsController = SC.ArrayController.create({
   contentBinding: 'App.pageSelectionController.columns'

   // again, where you want to show the columns, bind to
   // App.columnsController.arrangedObjects
});