RLMThreadSafeReference + non default RLMRealm instance

[stephenkopylov]

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Hello guys and thank you for Realm!

Goals

In my project, I have two instances of RLMRealm - primary and secondary and I have instances of Foo-object in both databases. So now I want to pass thread safe reference of Foo-object to the method, in which it's unknow which realm was used to store object.

I've found "realm" property in "RLMThreadConfined", but it's not accessible from public. Is it possible to recognise which realm was used to store RLMObject, referenced by RLMThreadSafeReference, without passing RLMRealm into method?

Code Sample

-(void)test{
	RLMRealm *realm1 = [RLMRealm realmWithConfiguration:config1];

	RLMRealm *realm2 = [RLMRealm realmWithConfiguration:config2];

	Foo *foo1 = [Foo objectsInRealm:realm1 where:@""][0];

	Foo *foo2 = [Foo objectsInRealm:realm2 where:@""][0];

	[self handleFoo:[RLMThreadSafeReference referenceWithThreadConfined:foo1]];

	[self handleFoo:[RLMThreadSafeReference referenceWithThreadConfined:foo2]];
}

-(void)handleFoo:(RLMThreadSafeReference*)ref{
    Foo *foo = [[RLMRealm defaultRealm] resolveThreadSafeReference:ref]; //obvious exception, with object, stored in non-default db
}

[bdash]

The simplest solution is to pass the configuration along with the thread safe reference, so you can resolve the reference in the appropriate Realm:

-(void)test{
    RLMRealm *realm1 = [RLMRealm realmWithConfiguration:config1];

    RLMRealm *realm2 = [RLMRealm realmWithConfiguration:config2];

    Foo *foo1 = [Foo objectsInRealm:realm1 where:@""][0];

    Foo *foo2 = [Foo objectsInRealm:realm2 where:@""][0];

    [self handleFoo:[RLMThreadSafeReference referenceWithThreadConfined:foo1] configuration:config1];

    [self handleFoo:[RLMThreadSafeReference referenceWithThreadConfined:foo2] configuration:config2];
}

-(void)handleFoo:(RLMThreadSafeReference*)ref configuration:(RLMRealmConfiguration *)config{
    Foo *foo = [[RLMRealm realmWithConfiguration:config] resolveThreadSafeReference:ref];
}

[stephenkopylov]

@bdash thank you! I'll make a small wrapper around RLMThreadSafeRefence to keep configuration inside the object, but Is it possible to add property with configuration into RLMThreadSafeReference in future releases?

[stephenkopylov]

I've made a small wrapper around RLMThreadSafeRefence, that keeps configuration inside https://github.com/stephenkopylov/SKThreadSafeReference

But anyway, IMHO it would be very useful to keep RLMRealmConfiguration into RLMThreadSafeRefence

[bdash]

You make a good point. We'll look to make this available in the future.