Goals

Trying to use a read-only synced realm to propagate data to clients. This will require reliable opening of the realm, with (after sync) or without internet connection (using cached local copy) at the time of application startup.

Expected Results

An API to reliably open a read only synced realm during application launch.

Actual Results

When online, Realm syncs and then opens with Async API (correct). Note: Read only synced realms can only be opened with AsyncOpen because conventional open will write data to the realm, according to other threads.

When offline, AsyncOpen will not return (to completion block) as it cannot connect to the server. Which is right, but leaves us with no way to open the realm.

RLMSyncManager error handler reports error with RLMSyncSession.

Steps to Reproduce

Async open a read only synced realm. Try again when disabling Internet connection.

Code Sample

NSURL *syncServerURL = [NSURL URLWithString: @"XXXXXXX"];

RLMRealmConfiguration *config = [RLMRealmConfiguration defaultConfiguration];

config.syncConfiguration = [[RLMSyncConfiguration alloc] initWithUser:loggedInUser realmURL:syncServerURL];


// Open the remote Realm
[RLMRealm asyncOpenWithConfiguration:config
                       callbackQueue:dispatch_get_main_queue()
                            callback:^(RLMRealm *realm, NSError *error)
 {
     if  (error)
     {
         NSLog(@"Error opening racing realm: %@", error);
         
     }
     else
     {
         if (realm)
         {
             NSLog(@"Opened Racing Realm");
             
         }
         else
         {
             NSLog(@"Error opening racing realm: Unspecified error");
             
         }
     }
 }];

Version of Realm and Tooling

Realm framework version: 2.8.3

Realm Object Server version:

Xcode version: 8.3

iOS/OSX version: 10

Dependency manager + version: CocoaPod