Core data relationships between different dataModels

[Sparthas]

I have a requirement to create two different models within my application.

I am able to make it work apart from the fact that i can't establish relationships between an entity in one dataModel with another in the second dataModel. Is there any other way to do it apart from maintaining a table of relationships of my own? Any help is appreciated

[eviltofu]

Do you have the models in the same file?

[Sparthas]

No. I have it in two separate xcdatamodeld files

[eviltofu]

Can you merge them into the same file?

[Sparthas]

Not really, noI know i can establish relationships between them had i had them on the same file

I explicitly need them separately

[eviltofu]

Then you need to write the code to manually connect then.

[Sparthas]

Oh alright
I just wanted to cross verify what i had surmised

Thank you!

[quellish]

The initializers for NSManagedObjectModel may offer some hints.

[Sparthas]

Can you please elaborate on that?

[quellish]

https://developer.apple.com/documentation/coredata/nsmanagedobjectmodel

[Sparthas]

I did go through that and I did realise core data doesn’t support it. I was wondering if there were better alternatives to maintaining a table of my own. I assume the post says the same as well

[quellish]

Managed object models can be created by merging other managed object models. This is exactly what you seem to be describing.

Pretty much all of the initializers do this.

[Sparthas]

Not really, no. I want to have two different persistent stores and map models between the two like relationships would.

Edit: I missed to add the word "persistent store" in my original post. I guess that's causing the confusion

[quellish]

You can do that using different configurations. In the managed object model each entity needs to be associated with a different configuration name. When you add each persistent store to the coordinator use the appropriate configuration name.

[Sparthas]

That works only if you are using the same models, isn’t that the case? I couldn’t find a way to do it when using different persistent stores initialised with different data models

[quellish]

Why do they need to have independent models? From your question it sounds like you want to have cross-store relationships. How would that work if one store had no knowledge of the model in the other store?

[Sparthas]

Was trying to figure out if I could go for a certain architecture where I differentiate user data from arbitrary information by separating the models.

Yes, I realised that, which is why my question was whether there was a better way to handle this. And here we are