Support uniqueKeys in arrays

[dudicoco]

Hi,

It would be very helpful if support for uniqueKeys was added, possibly via the following library: https://gregsdennis.github.io/json-everything/usage/vocabs-unique-keys.html

[sirosen]

If I'm reading correctly, json-schema-org/json-schema-vocabularies#22 was resolved by the independent creation of a vocabulary by the original issue requester.

The python jsonschema library does not have full support for vocabularies yet. And even when vocabulary support is finished, it looks like this might require custom support anyway.

None of that means that this can't be done someday, but I don't see the pieces in place today to support doing this.

[gregsdennis]

And even when vocabulary support is finished, it looks like this might require custom support anyway.

All vocabularies are going to require some custom logic to support. The vocab is the document that says what the keywords do. There may be a meta-schema that describes the syntax for the new keywords, but it can't describe the behavior.

[sirosen]

Thanks, that's good to know. I haven't been keeping up with the latest drafts (2019 and 2020), so I'm not that familiar with the vocabularies feature. I'll have to read more about how jsonschema intends to support these kinds of usages.

[gregsdennis]

Vocabularies as a concept aren't going away anyone soon. Currently they're still somewhat prototypical, but usable. We're looking into ways we can allow implementations to automate some of their functionality, but for now it's purely declarative, and implementations need to either support a given vocab or refuse to process a schema that requires it.

I'm happy to answer questions when you get to that area of support (and so are the other contributors to the spec). A good place to contact us is on the JSON Schema Slack.