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import json
from dataclasses import dataclass, field
from datetime import date
from apischema import order, serialize, serialized
@order({"trigram": order(-1)})
@dataclass
class User:
firstname: str
lastname: str
address: str = field(metadata=order(after="birthdate"))
birthdate: date = field()
@serialized
@property
def trigram(self) -> str:
return (self.firstname[0] + self.lastname[0] + self.lastname[-1]).lower()
@serialized(order=order(before=birthdate))
@property
def age(self) -> int:
age = date.today().year - self.birthdate.year
if age > 0 and (date.today().month, date.today().day) < (
self.birthdate.month,
self.birthdate.day,
):
age -= 1
return age
user = User("Harry", "Potter", "London", date(1980, 7, 31))
dump = f"""{{
"trigram": "hpr",
"firstname": "Harry",
"lastname": "Potter",
"age": {user.age},
"birthdate": "1980-07-31",
"address": "London"
}}"""
assert json.dumps(serialize(User, user), indent=4) == dump
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