How to use additionalProperties with allOf in JSON schema?

Question

Consider this example:

"allOf": [
    {"$ref": "test-address-prefix-types-base.json#"},
    {
        "properties": {}, "additionalProperties" : false
    }
]}

When I validate this with Java schema validator, I get error saying:

"keyword":"additionalProperties","message":"object instance has properties which are not allowed by the schema: [\"attributes\",\"type\"]"}]

but the same JSON object validated against the base schema (test-address-prefix-types-base) passes without error.

The referenced schema (base one) doesn't have additionalProperties set.

This is the json message I am using:

        String message = "{\"data\":{\"attributes\":{" +
            "\"notation\": \"A\"," +
            "\"prefixType\": \"A\"}" +
            ",\"type\":\"test-address-prefix-types\"}}";

Have I missed anything in schema? Thanks

Community · Accepted Answer · 2017-05-23 11:45:58Z

4

Your schema could be expanded this way:

allof: It must validate independently against two schemas:

First one with arbitrary properties linked through ref.
The second one which does not allow any property "additionalProperties" : false except those defined in the empty set "properties" : {}. In other words, it can not have any property.

This problem may be solved in draft-5 of the standard. More on this in the following SO question.

edited May 23, 2017 at 11:45

CommunityBot

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answered Aug 3, 2016 at 16:18

jruizaranguren

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3 Comments

xbmono Over a year ago

So the question is, this "merge" is only a proposal and not released yet, right? I've checked the json schema spec in json-schema.org and there is no mention of it. We are using AJV to validate and that's not supporting the merge yet.

jruizaranguren Over a year ago

Yes, you can not apply it safely yet. If possible, you may add "additionalProperties" : false to the referenced schema.

xbmono Over a year ago

Do you know if Json Schema Validator (github.com/daveclayton/json-schema-validator) supports $merge? I just realized that AJV added the support of $merge but we are using Json schema validator which is for Java and from what I can see here github.com/daveclayton/json-schema-validator/wiki/v5:-merge it supports $merge but I just can't get it working? It returns errors as $merge is not recognized

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