Switching and Validating Schemas based on attribute value

[mathan-mohan91]

Hey Folks, I have a question on creating Json Meta Schema.

High Level, this is how it looks like below

User-Schema

{
"properties" : {
"type" : {"type" : "string"},
"enum" : {"type" : "array"},
"rating": {"type": "integer"}
}

Customer-Schema

{
"properties" : {
"type" : {"type" : "string"},
"enum" : {"type" : "array"},
"comments": {"type": "string"}
}

I have a top level schema

{
"properties" : {
  "group" : {"type" : "string"},
  "properties" : {"type" : "object"} // basically it will be a Map<String, Either of user or customer schema>
}
}

I tried building a if else for validation

"if": {
"group" : {
"const" : "user" 
} 
},
"then":
"properties": {
"additionalProperties": {
"$ref" : "/user-schema"
}
},
"else" ... customer-schema
}

The above did not work as the additional Properties were not taken to consideration and still referencing the top-level schema for user and customer.
But wanted to understand we can have 2 different schemas under the same property and validate accordingly.

There was a similar discussion but it kinda deviated from the topic so looking for some inputs (https://github.com/orgs/json-schema-org/discussions/202)

[gregsdennis]

The likely issue is that your subschemas are missing a properties. For example, the if subschemas needs a properties outside of group. Currently it looks like group is a keyword, and since it's unknown it'll just be ignored, making the if always validate.

Also, you'll want to make group required in the if subschema if it's possible that group could be missing.

"if": {
  "properties": {
    "group" : {
      "const" : "user"
    }
  },
  "required": ["group"]
},
...