WiP: @Unique and @Index (Any help is welcome)

[Buggaboo]

I have a basic implementation, but the tests keep exploding with this though:

ObjectBoxException: failed to create store: 10501 No index ID/UID assigned for indexed property: Property uByte (15, Byte)

This error applies to all the @Unique annotated fields.

Afaik objectbox-model.json seems normal.

Help!

[greenrobot-team]

Just some quick feedback: @Unique is actually just a special @Index. So this AFAIK won't work without adding support for indexes first (at least that's how it works in Java). An index needs to get assigned an id/uid and be stored in the model file.

[greenrobot-team]

None of our examples use an index, yet. I should change that. ^^

OK, more details: the model file needs an indexId for each property. The last index id ever used should also be set as lastIndexId. Retired index UIDs need to move to retiredIndexUids.

...
        {
          "id": "13:8914743272487704330",
          "name": "dateProp",
          "indexId": "12:1548007883894887437",
          "type": 10,
          "flags": 8
        }
...
  "lastIndexId": "12:1548007883894887437",
...
  "retiredIndexUids": [],

So this is actually a lot more work than just adding the UNIQUE or INDEXED flag.

[Buggaboo]

What's the difference between id and uid?

[greenrobot-team]

What's the difference between id and uid?

IDs are given out in order (1, 2, 3...). The UID is a random number that identifies something over the lifetime of the Store.
https://docs.objectbox.io/advanced/meta-model-ids-and-uids goes into more details on this.

Side note: I updated the Kotlin example to use an index.
https://github.com/objectbox/objectbox-examples/tree/main/android-app-kotlin

[Buggaboo]

It took some work, but there should be a unified way to setup the models.

ObjectBoxException: failed to create store: 10001 State condition failed in assignIdsForProperty:476: indexId <= catalog.lastIndexId()

I have no idea what the above means, but its breaking everything.
I did stupid stuff like indexing booleans etc. only I got an OBException in runtime about the indexed float types.

Which other types are considered not a good idea to index/unique?

Help!

[greenrobot-team]

Thanks!

It's odd that objectbox.h does not document types that do not support an index. Peeking at the Java docs: https://docs.objectbox.io/entity-annotations#property-indexes-with-index Java byte arrays, float and double can't be indexed.

[greenrobot-team]

Thanks for getting this started! If time permits it I might continue on this tomorrow. It's kind of hard to get this right without any docs on how this should work internally.

[vaind]

replaced by #123