Self referencing classes leading to undefined-name (F821)

[aschamberger]

Describe the bug
Undefined name ISA95PropertyDataType for subproperties. The ISA95PropertyDataType should be replaced by Self

To Reproduce

Example schema:

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$defs": {
    "ISA95PropertyDataType": {
      "type": "object",
      "properties": {
        "ID": {
          "type": "string",
          "description": "Unique identifier for a property within the scope of the associated resource"
        },
        "Value": {
          "description": "Value for the property"
        },
        "Description": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/LocalizedText"
          },
          "description": "An optional description of the parameter."
        },
        "EngineeringUnits": {
          "$ref": "#/$defs/EUInformation",
          "description": "The Unit Of Measure of the value"
        },
        "Subproperties": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/ISA95PropertyDataType"
          }
        }
      },
      "description": "A subtype of OPC UA Structure that defines two linked data items: an ID, which is a unique identifier for a property within the scope of the associated resource, and the value, which is the data for the property.\nhttps://reference.opcfoundation.org/ISA95JOBCONTROL/v200/docs/7.3.9"
    }
}

Result:

@dataclass(kw_only=True)
class ISA95PropertyDataType:
    """
    A subtype of OPC UA Structure that defines two linked data items: an ID, which is a unique identifier for a property within the scope of the associated resource, and the value, which is the data for the property.
    https://reference.opcfoundation.org/ISA95JOBCONTROL/v200/docs/7.3.9
    """

    id: str | None = None
    """
    Unique identifier for a property within the scope of the associated resource
    """
    value: Any | None = None
    """
    Value for the property
    """
    description: list[LocalizedText] | None = None
    """
    An optional description of the parameter.
    """
    engineering_units: EUInformation | None = None
    """
    The Unit Of Measure of the value
    """
    subproperties: list[ISA95PropertyDataType] | None = None

Used commandline:

    data_model_types = get_data_model_types(
        DataModelType.DataclassesDataclass, target_python_version=PythonVersion.PY_314
    )
    config = JSONSchemaParserConfig(
        target_python_version=PythonVersion.PY_314,
        use_union_operator=True,
        use_standard_collections=True,
        formatters=[Formatter.RUFF_FORMAT, Formatter.RUFF_CHECK],
        custom_template_dir=pathlib.Path(__file__).parent / "template",
        data_model_type=data_model_types.data_model,
        data_model_root_type=data_model_types.root_model,
        data_model_field_type=data_model_types.field_model,
        data_type_manager_type=data_model_types.data_type_manager,
        dump_resolve_reference_action=data_model_types.dump_resolve_reference_action,
        keyword_only=True,
        use_subclass_enum=True,
        capitalise_enum_members=True,
        snake_case_field=True,
        use_field_description=True,
        use_schema_description=True,
        use_title_as_name=True,
        additional_imports=[
            "app.dataclass.DataClassConfig",
        ],
    )
    parser = JsonSchemaParser(schema_file_path.read_text(), config=config)
    result = parser.parse()

Expected behavior

    # ...
    subproperties: list[Self] | None = None

Version:

• OS: [e.g. iOS] Linux
• Python version: 3.14
• datamodel-code-generator version: 53

Additional context
Add any other context about the problem here.