Realm-cocoa: Realm crashes when Phone has low storage

[bbonathan]

Goals

To be able to run the app or view even when phone has a low storage

Expected Results

When going to the view, don't crash

Actual Results

It crashes with this error:

Thread 10: Fatal error: 'try!' expression unexpectedly raised an error: Error Domain=io.realm Code=1 "fcntl() inside prealloc() failed allocating 1184 bytes, new_size=1184, cur_size=0, allocated_size=0, event: No space left on device" UserInfo={NSLocalizedDescription=fcntl() inside prealloc() failed allocating 1184 bytes, new_size=1184, cur_size=0, allocated_size=0, event: No space left on device, Error Code=1}

Steps to Reproduce

• Fill phone with data (may be useless) to a point where phone prompts low storage. prefereably lower than 10 mb
• Open app
• Go to a view using realm

Code Sample

self.token = realm.objects(Data.self).sorted(byKeyPath: "date", ascending: false).observe({ change in ...

Version of Realm and Tooling

Realm framework version: 3.14.1

Xcode version: 10.2

iOS/OSX version: 10.14.4

[tgoyne]

If you don't want to crash when an i/o error occurs then handle the error with do/catch rather than using try!.