build_json_schema() fails for type defined with type keyword #293
Description
- mashumaro version: 3.16
- Python version: 3.13.5
- Operating System: Ubuntu 24.04
Description
Mashumaro fails to generate the schema when encountering a field that is annotated with a type that was declared with the type keyword.
What I Did
type B = dict[str, str]
print(build_json_schema(B).to_json())Traceback:
File "venv/lib/python3.13/site-packages/mashumaro/jsonschema/builder.py", line 51, in build_json_schema
schema = get_schema(instance, context, with_dialect_uri=with_dialect_uri)
File "venv/lib/python3.13/site-packages/mashumaro/jsonschema/schema.py", line 270, in get_schema
schema = schema_creator(instance, ctx)
File "venv/lib/python3.13/site-packages/mashumaro/jsonschema/schema.py", line 747, in on_collection
if not issubclass(instance.origin_type, Collection):
~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "<frozen abc>", line 123, in __subclasscheck__
TypeError: issubclass() arg 1 must be a class
The same error also occurs when using the type in a field for a TypedDict or @dataclass.