Type Unions Broken

[hthall13]

HashModels don't appear to support pydantic Unions.

# test.py

from typing import Union
from redis_om import JsonModel, HashModel

class JModel(JsonModel):
    param: Union[str, int]

class HModel(HashModel):
    param: Union[str, int]

The issue prevents initialization of the class:

$ python3 test.py 
Traceback (most recent call last):
  File "/home/user/project/test.py", line 7, in <module>
    class HModel(HashModel):
  File "/home/user/.local/lib/python3.10/site-packages/redis_om/model/model.py", line 1195, in __new__
    new_class = super().__new__(cls, name, bases, attrs, **kwargs)
  File "/home/user/.local/lib/python3.10/site-packages/pydantic/v1/main.py", line 282, in __new__
    cls = super().__new__(mcs, name, bases, new_namespace, **kwargs)
  File "/usr/lib/python3.10/abc.py", line 106, in __new__
    cls = super().__new__(mcls, name, bases, namespace, **kwargs)
  File "/home/user/.local/lib/python3.10/site-packages/redis_om/model/model.py", line 1496, in __init_subclass__
    if issubclass(origin, typ):
  File "/usr/lib/python3.10/typing.py", line 1158, in __subclasscheck__
    return issubclass(cls, self.__origin__)
TypeError: issubclass() arg 1 must be a class

I get the same error when incorporating Unions in JsonModel Fields as well.

# test2.py

from typing import Union
from redis_om import JsonModel, Field

class JModel(JsonModel):
    param: Union[str, int] = Field(default = 0)

Produces:

$ python3 test2.py 
Traceback (most recent call last):
  File "/home/user/project/test2.py", line 4, in <module>
    class JModel(JsonModel):
  File "/home/user/.local/lib/python3.10/site-packages/redis_om/model/model.py", line 1195, in __new__
    new_class = super().__new__(cls, name, bases, attrs, **kwargs)
  File "/home/user/.local/lib/python3.10/site-packages/pydantic/v1/main.py", line 282, in __new__
    cls = super().__new__(mcs, name, bases, new_namespace, **kwargs)
  File "/usr/lib/python3.10/abc.py", line 106, in __new__
    cls = super().__new__(mcls, name, bases, namespace, **kwargs)
  File "/home/user/.local/lib/python3.10/site-packages/redis_om/model/model.py", line 1675, in __init_subclass__
    cls.redisearch_schema()
  File "/home/user/.local/lib/python3.10/site-packages/redis_om/model/model.py", line 1742, in redisearch_schema
    schema_parts = [schema_prefix] + cls.schema_for_fields()
  File "/home/user/.local/lib/python3.10/site-packages/redis_om/model/model.py", line 1753, in schema_for_fields
    cls.schema_for_type(json_path, name, "", _type, field.field_info)
  File "/home/user/.local/lib/python3.10/site-packages/redis_om/model/model.py", line 1890, in schema_for_type
    elif any(issubclass(typ, t) for t in NUMERIC_TYPES):
  File "/home/user/.local/lib/python3.10/site-packages/redis_om/model/model.py", line 1890, in <genexpr>
    elif any(issubclass(typ, t) for t in NUMERIC_TYPES):
TypeError: issubclass() arg 1 must be a class

However excluding the Field class seems to keep this from happening:

# working code

from typing import Union
from redis_om import JsonModel

class JModel(JsonModel):
    param: Union[str, int]

if __name__ == "__main__":
    model = JModel(param=0)

Is this related to some problem with later pydantic versions? It looks like there are at least 3 PRs waiting to be reviewed to solve that problem: #548, #556, #577

redis-om: 0.2.1 pydantic: 2.0 pydantic_core = 2.0.1