I don't see an easy way to grant permissions to another user. It seems to be quite convoluted at the moment, and I wonder if I'm missing something obvious.
Say I want to invite another user to share a Realm. First I would have to ask the other user for their identification, then I would create the permission object, and then finally I would give the other user the address of my realm.
It would be great if I could share some sort of permission token via text message and let the new user register themselves. I suppose I could do that if I created another "User" which represented the shared group, and merely share this abstract user's credentials. It feels a bit hacky that way, but it seems easier to do.
I was hoping the demo application of the shared drawing environment would hold a clue, but after looking at the source code, it turns out both devices are logged in as the same user.
Am I missing something? Given the demo Draw application, how would one user practically invite a second user to join in their shared drawing environment? It seems like there would have to be a whole set of convoluted permissions and url/identification sharing handshakes.
Thanks for asking the question! Today, you will need to create a shared Realm that all users would input their user IDs into and have access to. This way any user can look up an ID and share access to another Realm.
We realize the limitations and are working on offering a number of improvements. The first is pretty close to what you describe, called a PermissionOffer object where you can inform the Realm Object Server you want to grant access to another user for a given Realm(s). The server will then provide a token you can share via any means with the other user. That user can then use the token to create a PermissionOfferResponse object and accept the access grant. This is coming soon, so stay tuned!
Later, we plan to offer a way to lookup user IDs so you don't have to replicate all of them in a shared Realm (see this issue).