Investigate properties with allOf to a ref

[timotheeguerin]

In openapi you cannot use any properties next to a $ref``. Autorest does allow a few to be able to be used on model properties like description, readonly`, etc.

Foo:
  name: 
    readOnly: true
    $ref: "#components/schemas/name"

However it should really be defined this way

Foo:
  name: 
    readOnly: true
    allOf: 
     - $ref: "#components/schemas/name"

Autorest does support this but needs a flag to be enabled --modelerfour.remove-empty-child-schemas and will log warnings. Believe we can be smart and figure out when this pattern is used and not log any warnings and remove the need for the flag.

[aelij]

One more thing to investigate:

          "foo": {
            "allOf": [
              {
                "$ref": "#/components/schemas/Foo"
              }
            ],
            "nullable": true
          }

Produces this code - ignores nullabe: true:

                    if (property.Value.ValueKind == JsonValueKind.Null)
                    {
                        property.ThrowNonNullablePropertyIsNull();
                        continue;
                    }