Generated intermediate models may shadow imports

Hey, great library, thank you!

Describe the bug

See Optional

To Reproduce

Example schema:

components:
  schemas:
    Config:
      properties:
        optional:
          type: object
          additionalProperties:
            type: array
            items:
              type: string

Used commandline:

$ datamodel-codegen --input-file-type openapi --strip-default-none --input test.yaml --output model.py

Produced:

from __future__ import annotations

from typing import Dict, List, Optional

from pydantic import BaseModel


class Optional(BaseModel):
    __root__: List[str]


class Config(BaseModel):
    optional: Optional[Dict[str, Optional]]

Version:

• OS: Windows 10
• Python version: 3.8
• datamodel-code-generator version: 0.7.2

[ofek]

Awesome, thank you!

[ofek]

@koxudaxi Take your time! Do the correct approach