typing.Dict cannot be used as a JsonModel field

[woutdenolf]

Python            3.9.18

hiredis           2.3.2
redis             5.0.4
redis-om          0.3.0
types-redis       4.6.0.20240425

pydantic          2.7.1
pydantic_core     2.18.2

This causes the exception

from typing import Dict
from redis_om import JsonModel


class ScanModel(JsonModel):
    info: Dict

Traceback (most recent call last):
  File "/home/denolf/tmp/blissdata.py", line 5, in <module>
    class ScanModel(JsonModel):
  File "/home/denolf/virtualenvs/pybox_rAqscR/lib/python3.9/site-packages/redis_om/model/model.py", line 1250, in __new__
    new_class = super().__new__(cls, name, bases, attrs, **kwargs)
  File "/home/denolf/virtualenvs/pybox_rAqscR/lib/python3.9/site-packages/pydantic/_internal/_model_construction.py", line 115, in __new__
    cls: type[BaseModel] = super().__new__(mcs, cls_name, bases, namespace, **kwargs)  # type: ignore
  File "/home/denolf/.pyenv/versions/3.9.18/lib/python3.9/abc.py", line 106, in __new__
    cls = super().__new__(mcls, name, bases, namespace, **kwargs)
  File "/home/denolf/virtualenvs/pybox_rAqscR/lib/python3.9/site-packages/redis_om/model/model.py", line 1813, in __init_subclass__
    cls.redisearch_schema()
  File "/home/denolf/virtualenvs/pybox_rAqscR/lib/python3.9/site-packages/redis_om/model/model.py", line 1882, in redisearch_schema
    schema_parts = [schema_prefix] + cls.schema_for_fields()
  File "/home/denolf/virtualenvs/pybox_rAqscR/lib/python3.9/site-packages/redis_om/model/model.py", line 1903, in schema_for_fields
    _type = get_outer_type(field)
  File "/home/denolf/virtualenvs/pybox_rAqscR/lib/python3.9/site-packages/redis_om/model/model.py", line 86, in get_outer_type
    return field.annotation.__args__[0]
  File "/home/denolf/.pyenv/versions/3.9.18/lib/python3.9/typing.py", line 711, in __getattr__
    raise AttributeError(attr)
AttributeError: __args__

The issue does not occur with "pip install redis-om<0.3"

Python            3.9.18

hiredis           2.3.2
redis             5.0.4
redis-om          0.2.2
types-redis       4.6.0.20240425

pydantic          2.4.2
pydantic_core     2.10.1