Question

我有一个Handlebars块正常呈现，直到我将它包装在一个自定义块中。具体来说，调用父上下文来获取extension FolderContent { @NSManaged var contentID: NSNumber? @NSManaged var contentTitle: String? @NSManaged var contentType: String? @NSManaged var publishDate: String? @NSManaged var folderList: NSSet? } extension FolderList { @NSManaged var folderID: NSNumber? @NSManaged var folderName: String? @NSManaged var folderDetail: NSSet? } func updateFolderList() { // Initialize Fetch Request let fetchRequest = NSFetchRequest() // Create Entity Description let entityDescription = NSEntityDescription.entityForName(FOLDER_LIST, inManagedObjectContext: self.managedObjectContext) // Configure Fetch Request fetchRequest.entity = entityDescription do { let result = try self.managedObjectContext.executeFetchRequest(fetchRequest).last as! FolderList let content = result.mutableSetValueForKey("folderDetail") content.addObject(self.getContent()) var folderContent:FolderContent = result.folderDetail?.allObjects.first as! FolderContent print(folderContent.contentTitle) self.save() print(result) } catch { let fetchError = error as NSError print(fetchError) } } func getContent()->FolderContent { let folderContent = NSEntityDescription.insertNewObjectForEntityForName(FOLDER_CONTENT, inManagedObjectContext: self.managedObjectContext) as! FolderContent folderContent.contentID = 1 folderContent.contentTitle = "Sandeep" folderContent.contentType = "Product" return folderContent }类型。请记住，此Handlebars块包含在Currency：

中

each

很清楚我知道问题出在哪里，我只是不确定如何解决它。

以下是Handlebars块：

{{#each this.SubscriptionOptions.MonthlySubscriptions}}

现在失败的作品是：

<p class="lead" style="font-size:40px">
  {{#ifGreaterThanZero PricePerBillingPeriod}}
    <strong>{{currency ../Currency}}{{priceFormat PricePerBillingPeriod}}</strong>
  {{else}}
    <strong>FREE</strong>
  {{/ifGreaterThanZero}}
</p>

以下是{{currency ../Currency}}帮助程序代码：

ifGreaterThanZero

我查看了Handlebars.registerHelper('ifGreaterThanZero', function(value, options) { var intVal = parseInt(value); if (intVal) { return options.fn(this); } else { options.inverse(this); } });，它实际上是订阅选项本身，因此它包含this。

问题是，如何获得它以便再次访问父上下文？

Answer 1

好的，所以我明白了。你必须上升一级。它不一定是对象意义上的父上下文，它是帮助父上下文，所以你越深入，它就像目录结构一样向上移动。

新代码如下所示：

<strong>{{currency ../../Currency}}{{priceFormat PricePerBillingPeriod}}</strong>

在自定义块中包装时，Helper会丢失父上下文

1 个答案: