ios 如何轻松删除 Realm 中的所有对象
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How can I easily delete all objects in a Realm
提问by CaptainCOOLGUY
I have the choice of doing a migration, but I would prefer to delete everything in my defaultRealm(). How can I do this easily?
我可以选择进行迁移，但我更愿意删除我的 defaultRealm() 中的所有内容。我怎样才能轻松做到这一点？
realm.deleteObject(object)
is the only function along with .deleteObjects.
是与 .deleteObjects 一起的唯一函数。
I have tried the following code:
我尝试了以下代码：
Method 1
方法一
realm.deleteObjects(RLMObject.objectsInRealm(realm, withPredicate: NSPredicate(value: true)))
Method 2
方法二
realm.deleteObjects(Dog.allObjectsInRealm(realm))
realm.deleteObjects(Person.allObjectsInRealm(realm))
realm.deleteObjects(Goal.allObjectsInRealm(realm))
realm.deleteObjects(Goals.allObjectsInRealm(realm))
Both fail to prevent the migration exception.
两者都无法防止迁移异常。
回答by jpsim
回答by Michael McGuire
As of v0.87.0, there is a deleteAllObjectsmethod on RLRealmthat will clear the Realm of all objects.
从v0.87.0 开始，有一种deleteAllObjects方法RLRealm可以清除所有对象的 Realm。
回答by David Glance
Things have moved on in the Realm world - in case anyone comes across this now, there is a property that can be set:
Realm 世界中的事情已经发生了变化 - 如果现在有人遇到这个问题，可以设置一个属性：
Realm.Configuration.defaultConfiguration.deleteRealmIfMigrationNeeded = true
It then does as advertised. (btw: a lot of the syntax above has changed in case you are trying any of the other methods)
然后它会按照宣传的那样做。（顺便说一句：如果您正在尝试任何其他方法，上面的很多语法都已更改）
The Github PR https://github.com/realm/realm-cocoa/pull/3463
回答by zubko
I think removing the Realm DB file is the valid answer considering that the question was about removing a whole storage rather than migrating it.
考虑到问题是关于删除整个存储而不是迁移它，我认为删除 Realm DB 文件是有效的答案。
Here is a quick Swift code for that (as of Swift 2.1 and Realm 0.96.2):
这是一个快速的 Swift 代码（从 Swift 2.1 和 Realm 0.96.2 开始）：
if let path = Realm.Configuration.defaultConfiguration.path {
try! NSFileManager().removeItemAtPath(path)
}
I use this code in the DEBUG version of the app if the migration error happens on loading the storage and then I recreate the storage. During development the schema can change a lot, so it would be too cumbersome to bother with migration all the time.
如果在加载存储时发生迁移错误，我会在应用程序的调试版本中使用此代码，然后我重新创建存储。在开发过程中，模式可能会发生很大变化，因此一直困扰着迁移会很麻烦。
