为什么Realm对象中没有我的财产? [英] Why is my property absent from the Realm object?

问题描述

我使用Realm进行持久性处理，无法访问标记为只读的属性.

I'm using Realm for persistence and I cannot access properties which are marked as readonly.

更准确地说，我可以使用点符号来打印它们，但是po object仅显示读写属性，并尝试使用objectsWhere崩溃来访问只读属性.

More accurately, I can print them using dot notation, but po object only shows the readwrite properties, and trying to access readonly properties using objectsWhere crashes.

我已经使用标准的NSObject类进行了测试，问题消失了(对于po显然)，这让我想知道为什么/如果Realm忽略了只读属性?

I've tested using a standard NSObject class and the issue disappears (for po obviously), which makes me wonder why/if Realm ignores readonly properties?

推荐答案

那是正确的！如果将属性标记为readonly，则Realm会忽略该属性，并且不会在数据库文件中为其创建备份.这与在RLMObject的ignoredProperties方法中放置方法的隐式行为相同.它们保留为传统的Objective-C属性. :)

That's correct! If a property is marked as readonly, Realm ignores it and doesn't create a backing for it in the database file. This is the same implicit behavior as placing a method in the ignoredProperties method of RLMObject. They are left as traditional Objective-C properties. :)

如果需要使该属性在po object命令中可见，则可以覆盖对象的- (NSString *)description方法，并确保您的对象包含在打印的描述字符串中.

If you need to make the property visible in the po object command, you can override the - (NSString *)description method of your object and ensure that your object is included in the description string that is printed.

由于readonly属性不受Realm支持，因此在使用objectsWhere时，它们将受到很大的限制，因为该属性使用自定义Realm查询引擎.您可能可以检查其他Realm属性是否与该属性匹配，但是无法使用该属性本身作为要搜索的项目来创建查询.

Since readonly properties aren't backed by Realm, they'll be quite limited in what you can do with objectsWhere, as that uses a custom Realm query engine. You can probably check if other Realm properties match that property, but you couldn't create a query using the property itself as the item being searched for.

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