Использование Pydantic сегодня стало нормой, и это правильно. Но иногда на ревью вижу, что используют его не всегда корректно.
Например, метод BaseModel.model_dump() по умолчанию не преобразует стандартные типы, такие как datetime, UUID или Decimal, в простой сериализуемый для JSON вид. Тогда пишут кастмоный сериализатор для этих типов чтобы функция json.dump() не падала с ошибкой.
import uuid
from datetime import datetime
from decimal import Decimal
from uuid import UUID
from pydantic import BaseModel
class MyModel(BaseModel):
id: UUID
date: datetime
value: Decimal
obj = MyModel(
id=uuid.uuid4(),
date=datetime.now(),
value='1.23'
)
print(obj.model_dump())
# не подходит для json.dump
# {
# 'id': UUID('4f8c1bc4-25fd-40cd-9dbe-2c73639b0dc1'),
# 'date': datetime.datetime(2025, 12, 12, 12, 12, 12, 111111),
# 'value': Decimal('1.23')
# }
# добавляем свой кастомный сериализатор
json.dumps(obj.model_dump(), cls=MySerializer)
# {
# 'id': '4f8c1bc4-25fd-40cd-9dbe-2c73639b0dc1',
# 'date': '2025-12-12T12:12:12.111111',
# 'value': '1.23'
# }
В данном случае класс MySerializer обрабатывает datetime, UUID и Decimal. Например так:
class MySerializer(json.JSONEncoder):
def default(self, o):
if isinstance(o, Decimal):
return str(o)
elif isinstance(o, datetime):
return o.isoformat()
elif isinstance(o, UUID):
return str(o)
return super().default(o)
Специально для тех, кто всё еще так делает - в этом нет необходимости!
Pydantic может это сделать сам, просто нужно добавить параметр mode="json".
json.dumps(obj.model_dump(mode="json"))
# {
# 'id': '4f8c1bc4-25fd-40cd-9dbe-2c73639b0dc1',
# 'date': '2012-12-12T12:12:12.111111',
# 'value': '1.23'
# }
#pydantic#libs
🔥$CAT
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X: https://x.com/itscatcoin?s=21
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🔥$RAY
Entered this position as a speculative play within the SOLANA ecosystem. Monitor pullbacks carefully, manage entries with discipline, and always conduct your own due diligence before participating.
X: https://x.com/i/communities/2033099708164378981
Website: https://x.com/bbcworld/status/2033099192877429170?s=46
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🔥 $BAGWORKOOR
Entered this position as a speculative play within the SOLANA ecosystem. Monitor pullbacks carefully, manage entries with discipline, and always conduct your own due diligence before participating.
X: https://x.com/i/communities/2033254050209153139
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🔥$GOMU
A meme-powered token inspired by Gomu Gator, bringing fun, viral energy, and a strong community to the Solana ecosystem. Built for memes, momentum, and the next wave of degen culture. 🚀
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X: https://x.com/notgaymeme?s=21
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🔥$MEMECARD
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X: https://x.com/memecardss?s=21
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🔥$SOS
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Telegram: https://t.me/sos_portal
X: https://x.com/i/communities/2031245794964344896
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🔥$FROGS
Rolled the dice on this BSC play dip hunters know the drill: time it right, and always DYOR.
X: https://x.com/christanxsx/status/2019762141427900628?s=46
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https://dexscreener.com/bsc/0x3357047F963d6459FB8C4e43c78392e09734e53C
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Another day, another planet… we’ll send a picture from there soon 🤭🚀
The $WHITEHOUSE narrative is gaining attention momentum continues to build as the community grows stronger.
CA:
7oXNE1dbpHUp6dn1JF8pRgCtzfCy4P2FuBneWjZHpump
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