)
from fastapi.datastructures import DefaultPlaceholder
from fastapi.dependencies.models import Dependant
from fastapi.dependencies.utils import (
    _get_flat_fields_from_params,
    get_flat_dependant,
    get_flat_params,
    get_validation_alias,
)
from fastapi.encoders import jsonable_encoder
from fastapi.exceptions import FastAPIDeprecationWarning
from fastapi.openapi.constants import METHODS_WITH_BODY, REF_PREFIX

    if len(fields) == 1 and lenient_issubclass(first_field.type_, BaseModel):
        fields_to_extract = get_cached_model_fields(first_field.type_)
        return fields_to_extract
    return fields


def get_flat_params(dependant: Dependant) -> list[ModelField]:
    flat_dependant = get_flat_dependant(dependant, skip_repeats=True)
    path_params = _get_flat_fields_from_params(flat_dependant.path_params)