ObjectID?

[Calvin Tam Wah Kit]

Is there a way to get an object's ID? I am trying to transition my existing code from Coredata to realm, and it's quite reliant on objectIDs to query. 

[Alexander Stigsen]

Objects in Realm does not have an object ID (they don't need any since relations are not join based). If you need object ID's in your queries, the recommended way to do it is just to add a property to the object with a value you can use as ID.

We know that many applications have been designed around the availability of Object ID's, so we will be adding an ID property type with an automatic unique id. It is on the roadmap.

On Wed, Jul 16, 2014 at 10:52 AM, Calvin Tam Wah Kit <wah...@gmail.com> wrote:

Is there a way to get an object's ID? I am trying to transition my existing code from Coredata to realm, and it's quite reliant on objectIDs to query. 

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[JP Simard]

Alex is right. Here’s an example of how you could add an objectID property to your models:

@interface Person : RLMObject

// ObjectID property

@property NSString *objectID;

// Model properties

@property NSString *name;

// etc...

@end

// Elsewhere

RLMRealm *realm = self.realmWithTestPath;

[realm beginWriteTransaction];

Person *mary = [Person new];

mary.name = @"mary";

mary.objectID = [[NSUUID UUID] stringValue];

[realm commitWriteTransaction];

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[Calvin Tam Wah Kit]

Thanks guys, this have been really helpful. I looked up on NSUUID, seems like its quite reliable for now to create unique IDs. Looking forward for an official one tho.

Overall I am really impressed with Realm, it really is much easier than Coredata. Great job guys!

[Tim Anglade]

Thank you Calvin! Keep the questions coming :)

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[Zsombor Papp]

Do you happen to have an update on when this unique ID feature (or at least auto-incrementing fields) might be available?

In the meantime: where is it documented that multiple calls to [NSUUID UUID] is guaranteed to return unique values?

Thanks,
Zsombor

[Joe Anderson]

Hi Zsombor,

We are still considering the way we want to approach it, keeping in mind sync across all devices, so there are no updates for right now. You can check out this article here to learn more about the guaranteed unique values from UUID.

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[Zsombor Papp]

Thanks Joe.

Could you please quote here the relevant part of that NSHipster article? As far as I can tell it doesn't address the problem of multiple calls to [NSUUID UUID] always returning unique values. The closest it comes is this: "a sequence of 128 bits that can guarantee uniqueness across space and time", which is a direct quote from the RFC and doesn't say anything about the implementation of [NSUUID UUID].

[Joe Anderson]

No problem! That was the line I was referring to. I think you will have to dive deeper into that research article that is being referred. Apple's documentation refers to it as well

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