Realm object has been deleted or invalidated

You can check if an object has been deleted from the Realm by calling object.invalidated -- if it returns true, then it has been deleted or the Realm has manually invalidated.

I got a really nice way to catch a RLMException within Swift.

Currently Swift doesn't show where a RLMException happened.

In Realm/RLMUtil.mm:266, there is the definition for RLMException.

If you change the code to generate a swift error,

Xcode now can show you where the exception occurred.

Now it is a part of Swift.

// Realm/RLMUtil.mm:266static NSException *RLMException(NSString *reason, NSDictionary *additionalUserInfo) {    // add some code to generate a swift error. E.g. division-by-zero.    int a = 0;    if (reason == nil) {        a = 1;    }    NSLog(@"calculating 1 / %d = %f", a, 1 / a);    ... remainder of the original code...}

I've just place breakpoint inside method:

// Realm/RLMUtil.mm:193static NSException *RLMException(NSString *reason, NSDictionary *additionalUserInfo) {    // ...}

And on left panel you can check stack trace, here you can find where error throws.