使用 Realm 在查询中过滤具有两个嵌套级别的对象

Question

我有一个这样的模型：

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class CalendarEvent: Object, Mappable {\n\n\ndynamic var exId = ""\n@objc dynamic var title:String = ""\n@objc dynamic var desc:String = ""\ndynamic var fullDate = Date()\ndynamic var date = ""\ndynamic var time = ""\ndynamic var location = ""\ndynamic var subcategory:Subcategory?\ndynamic var update = false\nvar participants = List<Participant>()\n}\n\nclass Category:Object, Mappable{\ndynamic var exId = ""\n@objc dynamic var name="";\nvar subcategories = List<Subcategory>()\n}\n\nclass Subcategory:Object, Mappable{\ndynamic var exId = ""\ndynamic var name = ""\nlet category = LinkingObjects(fromType: Category.self, property: "subcategories")\ndynamic var active:Bool = true\ndynamic var update = false\n}\n

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我需要知道哪些 CalendarEvents 来自某个类别，何时来自子类别，我可以这样做：

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var results = realm.objects(CalendarEvent.self)\nresults = results.filter("ANY subcategory.exId == %@", subcategory!.exId)\n

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但是，当我需要获取按类别过滤的 CalendarEvents 时，我不知道该怎么做。我查看了解决方案，但没有找到 \xc2\xb4t 任何地方。请帮忙！

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Answer 1

作为记录，我找到了解决方案。它很简单，您需要细分查询和链接，然后使用“IN”。例如：

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let resultsSubcategory = realm.objects(Subcategory.self).filter("ANY category.exId == %@", category?.exId)\n        results = results.filter("subcategory IN %@", resultsSubcategory) \n

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