🔒 Hi all,

[edgy python]

I'm learning Pydantic and I just learned about AliasPath. See the attached example.

I can't figure out how to do this the other way around, have a flat input and output a nested model where "address" holds the address-items. Any suggestions on how to do this ?

[glossy lion]

@edgy python

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[sinful pilot]

Not sure, but I think you should try creating another model called Address and using it as a field in Person?

[edgy python]

Thanks for pointing me in the right direction, it works with this code:

from typing import Any
from pydantic import BaseModel, model_validator

person_data: dict[str, Any] = {
    "first_name": "Jane",
    "last_name": "Doe",
    "date_of_birth": "1990-05-15",
    "street_name": "Maple Street",
    "house_number": 42,
    "zip_code": "12345",
    "city": "Miami",
    "income": 100000,
}


class Address(BaseModel):
    street_name: str
    house_number: int
    zipcode_code: str
    city: str


class Person(BaseModel):
    first_name: str
    last_name: str
    date_of_birth: str
    address: Address
    income: int

    @model_validator(mode="before")
    def build_nested_address(cls, values: dict) -> dict:
        # Create a copy of the original flat dict for the root model
        result = values.copy()

        # Create the nested address structure using the same flat dict
        result["address"] = values

        return result


person = Person(**person_data)
print(person.model_dump_json(indent=4))

[main zinc]

@edgy python Nice one! Well done.

[glossy lion]

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