pydantic_model_creator is not generating tortoise.field.CharEnumField as enumeration

Describe the bug I am currently using the method pydantic_model_creator from tortoise.contrib.pydantic to generate my pydantic model from my tortoise model.

However, the generation is not behaving as I would expect it to be for the tortoise field CharEnumField. The pydantic model generated from a tortoise model containing a CharEnumField is set as a Char field and not an Enum field. The OpenApi schema generated is:

"my_enum": {
    "title": "My Enum",
    "description": "A: a<br/>B: b<br/>C: c",
    "maxLength": 1,
    "type": "string"
}

The OpenApi schema generated from a pydantic mode (that is not created from a tortoise model) results in the following:

"MyEnum": {
    "title": "MyEnum",
    "description": "An enumeration.",
    "enum": [
        "a",
        "b",
        "c"
    ],
    "type": "string"
}

To Reproduce

from enum import Enum

from pydantic import BaseModel
from tortoise import fields
from tortoise.contrib.pydantic import pydantic_model_creator
from tortoise.models import Model


class MyEnum(str, Enum):
    A = "a"
    B = "b"
    C = "c"


class MyModel(Model):
    my_enum = fields.CharEnumField(MyEnum)


class MyModelPydantic(BaseModel):
    my_enum: MyEnum


MyModelPydanticCreator = pydantic_model_creator(MyModel, name="MyModelPydanticCreator")

print(MyModelPydanticCreator.schema_json(indent=2))
# Output :
# {
#     "title": "MyModelPydanticCreator",
#     "type": "object",
#     "properties": {
#         "id": {
#             "title": "Id",
#             "minimum": 1,
#             "maximum": 2147483647,
#             "type": "integer"
#         },
#         "my_enum": {
#             "title": "My Enum",
#             "description": "A: a<br/>B: b<br/>C: c",
#             "maxLength": 1,
#             "type": "string"
#         }
#     },
#     "required": [
#         "id",
#         "my_enum"
#     ],
#     "additionalProperties": false
# }

print(MyModelPydantic.schema_json(indent=2))
# Output :
# {
#     "title": "MyModelPydantic",
#     "type": "object",
#     "properties": {
#         "my_enum": {
#             "$ref": "#/definitions/MyEnum"
#         }
#     },
#     "required": [
#         "my_enum"
#     ],
#     "definitions": {
#         "MyEnum": {
#             "title": "MyEnum",
#             "description": "An enumeration.",
#             "enum": [
#                 "a",
#                 "b",
#                 "c"
#             ],
#             "type": "string"
#         }
#     }
# }

Expected behaviour I would expect that both ways of creating the pydantic model result in the same OpenApi schema/Pydantic model, i.e. using an enum field and not a basic char field.

Additional context I am using FastApi / Tortoise-Orm / Pydantic. I came across this problem because my pydantic model (which is the body requested by my FastApi endpoint) was letting strings that are not in my enum through the endpoint entry.

[ref0x]

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[simsim0709]

I have same problem. Any update?