from pydantic import BaseModel, SecretStr
from fastapi.encoders import jsonable_encoder


class Credentials(BaseModel):
    password: SecretStr


ENCODERS = {SecretStr: lambda v: v.get_secret_value() if v is not None else None}

creds = Credentials(password="helloworld")

a = jsonable_encoder(creds)
print(a)  # {'password': '**********'}, as expected
b = jsonable_encoder(creds, custom_encoder=ENCODERS)
print(b)  # {'password': 'helloworld'}, as expected
c = jsonable_encoder(creds)
print(c)  # gives {'password': 'helloworld'}, but should be {'password': '**********'}?


creds = Credentials(password="123456789")

d = jsonable_encoder(creds)
print(d)  # gives {'password': '123456789'}, but should be {'password': '**********'}?