Swagger deserializer ignores JsonSchema.types() for v3.1.0

[jokoroukwu]

Consider the following schema:

Rule:
      type: object
      properties:
        id:
          type: string
          format: uuid
        name:
          type: string
        condition:
          type: string
        order:
          type: integer
        enabled:
          type: boolean
        actions:
          type: array
          description: List of actions launched on rule execution
          items:
            $ref: '#/components/schemas/ActionDescriptor'
        version:
          type: integer
          description: Version counter

This schema is deserialized into JsonSchema.
The type is present in JsonSchema.types but for some reason the actual JsonSchema.type is set to "object".

I've found that the object type is set in ResolveFully.resolveSchema()
if (property.getProperties() != model.getProperties()) { if (property.getType() == null) { property.setType("object"); }

Also if the open api is of version 3.1 which is in my case then OpenAPIDeserializer.getJsonSchema() is being invoked which eventually sets type via schema.addType(typeString);.
However If open api version is different then 'OpenAPIDeserializer.getSchema()' is being invoked and in this case the type is set via schema.setType(value);

[spacether]

Related #1801

[frantuma]

This has been addressed by #1846 (fixed bug for 3.1 setting type instead of types and swagger-api/swagger-core#4285.

When deserializing/parsing OAS 3.1 / JSON Schema 2020/12 documents, the type field is deserialized into Schema.types member (as draft 2020/12 supports array of types), while with OAS 3.0 it is deserialized into Schema.type field. Serialization to YAML/JSON behaves in the same way.

Programmatic access to Schema "type(s)" in 3.1 is provided via Set<String> Schema.getTypes() to be able to support arrays.

In 3.1 Schema.type field is not populated (as bug above is fixed in #1846), and by default Schema.getType() returns null;
since Swagger Core 2.2.6 / Swagger Parser 2.1.8 bind-type=true can be provided as System Property to have Schema.getType() return the value of the single item of set Schema.getTypes() when types has a single element.

Such usage is probably discouraged except in scenarios where the accessed Schema in the OAS document is surely having a single value for type defined, otherwise the additional types would be lost