Tag Create Dto

@field_validator("color", mode="before")
def color_validate_regular_expression(cls, value):
    """Validates the regular expression"""
    if value is None:
        return value

    if isinstance(value, str) and not re.match(
        r"^#?([0-9A-Fa-f]{3}|[0-9A-Fa-f]{4}|[0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})$", value
    ):
        raise ValueError(
            r"must validate the regular expression /^#?([0-9A-Fa-f]{3}|[0-9A-Fa-f]{4}|[0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})$/"
        )
    return value

@classmethod
def from_dict(cls, obj: Optional[Dict[str, Any]]) -> Optional[Self]:
    """Create an instance of TagCreateDto from a dict"""
    if obj is None:
        return None

    if not isinstance(obj, dict):
        return cls.model_validate(obj)

    _obj = cls.model_validate(
        {
            "color": obj.get("color"),
            "name": obj.get("name"),
            "parentId": obj.get("parentId"),
        }
    )
    return _obj

@classmethod
def from_json(cls, json_str: str) -> Optional[Self]:
    """Create an instance of TagCreateDto from a JSON string"""
    return cls.from_dict(json.loads(json_str))

@field_validator("name", mode="before")
def name_validate_regular_expression(cls, value):
    """Validates the regular expression"""
    if isinstance(value, str) and not re.match(r"^[^\/]*$", value):
        raise ValueError(r"must validate the regular expression /^[^\/]*$/")
    return value

@field_validator("parent_id", mode="before")
def parent_id_validate_regular_expression(cls, value):
    """Validates the regular expression"""
    if value is None:
        return value

    if isinstance(value, str) and not re.match(
        r"^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-4[0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12})$",
        value,
    ):
        raise ValueError(
            r"must validate the regular expression /^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-4[0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12})$/"
        )
    return value

def to_dict(self) -> Dict[str, Any]:
    """Return the dictionary representation of the model using alias.

    This has the following differences from calling pydantic's
    `self.model_dump(by_alias=True)`:

    * `None` is only added to the output dict for nullable fields that
      were set at model initialization. Other fields with value `None`
      are ignored.
    """
    excluded_fields: Set[str] = set([])

    _dict = self.model_dump(
        by_alias=True,
        exclude=excluded_fields,
        exclude_none=True,
    )
    # set to None if color (nullable) is None
    # and model_fields_set contains the field
    if self.color is None and "color" in self.model_fields_set:
        _dict["color"] = None

    # set to None if parent_id (nullable) is None
    # and model_fields_set contains the field
    if self.parent_id is None and "parent_id" in self.model_fields_set:
        _dict["parentId"] = None

    return _dict

def to_json(self) -> str:
    """Returns the JSON representation of the model using alias"""
    return json.dumps(to_jsonable_python(self.to_dict()))

def to_str(self) -> str:
    """Returns the string representation of the model using alias"""
    return pprint.pformat(self.model_dump(by_alias=True))