Optional Pydantic field fails in graphql_fields

[guy-ecton]

Describe the bug
Trying to use an Optional Pydantic field with a primitive type (like str)

To Reproduce
Steps to reproduce the behavior:

class Foo(GraphQLQueryBaseModel):
  name: Optional[str] = None

Foo.graphql_fields()

Exception:

AttributeError: type object 'str' has no attribute 'model_fields'
File graphql_query/base_model.py", line 27, in _get_fields
    for f_name, f in model.model_fields.items():
                     ^^^^^^^^^^^^^^^^^^

• Python: 3.12.8
• graphql-query: 1.4.0
• pydantic: 2.10.6

[keeganpoppen]

aw damn i'm having this issue too! 'tis a shame, because otherwise this library is pretty money. i guess i'll try to find some hack around it.