How can I easily delete all objects in a Realm

Question

I have the choice of doing a migration, but I would prefer to delete everything in my defaultRealm(). How can I do this easily?

realm.deleteObject(object)

is the only function along with .deleteObjects.

I have tried the following code:

Method 1

realm.deleteObjects(RLMObject.objectsInRealm(realm, withPredicate: NSPredicate(value: true)))

Method 2

        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.

Hey Captain, are you doing this on ios or android? Those methods do delete all the objects but you will still run into the migration issues. — yoshyosh
– yoshyosh, Commented Oct 3, 2014 at 20:27
A quick way to do this on simulator/phone is to just delete the app from the home screen — yoshyosh
– yoshyosh, Commented Oct 3, 2014 at 21:04

Ryan Brodie · Accepted Answer · 2016-08-24 08:07:53Z

115

Use deleteAll():

let realm = try! Realm()
try! realm.write {
    realm.deleteAll()
}

edited Aug 24, 2016 at 8:07

Ryan Brodie

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answered Oct 7, 2014 at 20:37

jpsim

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5 Comments

CaptainCOOLGUY Over a year ago

Thanks, you guys should add that to the documentation!

jpsim Over a year ago

This is documented in Realm's API docs: realm.io/docs/objc/latest/api/Classes/RLMRealm.html#//api/name/…, which are more comprehensive than Realm's getting started documentation at realm.io/docs/objc/latest.

John B. Over a year ago

I think the API changed a bit. For me to remove all objects using RealmSwiftthis worked: try! realm.write { realm.deleteAll() }

Ryan Brodie Over a year ago

@JohnB. Updated answer.

atom2ueki Over a year ago

if the realm notification still running that time, it might cause crash, if directly use realm.deleteAll()

Michael McGuire · Accepted Answer · 2014-10-23 16:17:52Z

16

As of v0.87.0, there is a deleteAllObjects method on RLRealm that will clear the Realm of all objects.

answered Oct 23, 2014 at 16:17

Michael McGuire

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4 Comments

Michael McGuire Over a year ago

@cesarferreira I recommend you file an issue with Realm (github.com/realm/realm-cocoa/issues) then.

yoshyosh Over a year ago

@cesarferreira can you share the code in github issues?

cesarferreira Over a year ago

what do you mean with share github issue?

yoshyosh Over a year ago

If you can create a github issue you can copy and paste some code in there to show where it's not working for you

David Glance · Accepted Answer · 2016-06-03 12:27:43Z

12

Things have moved on in the Realm world - in case anyone comes across this now, there is a property that can be set:

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)

The Github PR https://github.com/realm/realm-cocoa/pull/3463

answered Jun 3, 2016 at 12:27

David Glance

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Comments

zubko · Accepted Answer · 2015-11-08 13:08:04Z

5

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.

Here is a quick Swift code for that (as of Swift 2.1 and Realm 0.96.2):

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.

answered Nov 8, 2015 at 13:08

zubko

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