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
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✨ ADC International Youth Summit 2026 ✨
Biz yilning eng yirik va ilhomlantiruvchi tadbirlaridan biri — ADC International Youth Summit 2026’dan yorqin lahzalarni siz bilan baham ko‘rishdan mamnunmiz!
Ushbu sammit turli mamlakatlardan kelgan faol va ambitsiyali yoshlar, liderlar, spikerlar hamda ekspertlarni birlashtirdi. Mazmunli kunlar davomida ishtirokchilar fikr almashdilar, yangi bilimlarga ega bo‘ldilar, yangi tanishuvlar orttirdilar va o‘z kelajagi sari muhim qadamlar qo‘ydilar.
Har bir ishtirokchi bilan faxrlanamiz va ushbu tadbirning bir qismi bo‘lgan barchaga minnatdorchilik bildiramiz!
#ADC#YouthSummit2026#InternationalSummit#Leadership#Education#FutureLeaders
📞 742261078
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✨ ADC International Youth Summit 2026 ✨
We are excited to share some of the brightest moments from one of the most large-scale and inspiring events of the year — ADC International Youth Summit 2026!
This summit brought together active and ambitious youth, leaders, speakers, and experts from different countries. Throughout these productive days, participants exchanged ideas, gained new knowledge, built valuable connections, and took important steps toward their future.
We are proud of every participant and grateful to everyone who became part of this incredible event!
#ADC#YouthSummit2026#InternationalSummit#Leadership#Education#FutureLeaders
📞 742261078
📲 Telegram: @admofadc
✨ ADC International Youth Summit 2026 ✨
Мы рады поделиться яркими моментами с одного из самых масштабных и вдохновляющих событий этого года — ADC International Youth Summit 2026!
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#ADC#YouthSummit2026#InternationalSummit#Leadership#Education#FutureLeaders
📞 742261078
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✨ ADC International Youth Summit 2026 ✨
Biz yilning eng yirik va ilhomlantiruvchi tadbirlaridan biri — ADC International Youth Summit 2026’dan yorqin lahzalarni siz bilan baham ko‘rishdan mamnunmiz!
Ushbu sammit turli mamlakatlardan kelgan faol va ambitsiyali yoshlar, liderlar, spikerlar hamda ekspertlarni birlashtirdi. Mazmunli kunlar davomida ishtirokchilar fikr almashdilar, yangi bilimlarga ega bo‘ldilar, yangi tanishuvlar orttirdilar va o‘z kelajagi sari muhim qadamlar qo‘ydilar.
Har bir ishtirokchi bilan faxrlanamiz va ushbu tadbirning bir qismi bo‘lgan barchaga minnatdorchilik bildiramiz!
#ADC#YouthSummit2026#InternationalSummit#Leadership#Education#FutureLeaders
📞 742261078
📲 Telegram: @admofadc
🌟 ADC International Youth Summit 2026
Yilning eng yirik va ilhomlantiruvchi tadbirlaridan biri — ADC Xalqaro Yoshlar Sammiti o‘z yakuniga yetdi!🌍✨
Ushbu sammit turli mamlakatlardan kelgan eng faol yoshlar, yetakchilar va ekspertlarni bir nuqtada birlashtirdi. Ishtirokchilar tajriba almashishdi, yangi bilimlar olishdi va kelajak sari muhim qadam tashlashdi. Biz har bir ishtirokchi bilan faxrlanamiz!
✨ADC International Youth Summit 2026✨
We are excited to share some of the brightest moments from one of the most large-scale and inspiring events of the year — ADC International Youth Summit 2026!
This summit brought together active and ambitious youth, leaders, speakers, and experts from different countries. Throughout these productive days, participants exchanged ideas, gained new knowledge, built valuable connections, and took important steps toward their future.
We are proud of every participant and grateful to everyone who became part of this incredible event!
#ADC#YouthSummit2026#InternationalSummit#Leadership#Education#FutureLeaders#YoshlarSammati
📞 742261078
📲 Telegram: @admofadc
🌟 ADC International Youth Summit 2026
Yilning eng yirik va ilhomlantiruvchi tadbirlaridan biri — ADC Xalqaro Yoshlar Sammati o‘z yakuniga yetdi!🌍✨
Ushbu sammit turli mamlakatlardan kelgan eng faol yoshlar, yetakchilar va ekspertlarni bir nuqtada birlashtirdi. Ishtirokchilar tajriba almashishdi, yangi bilimlar olishdi va kelajak sari muhim qadam tashlashdi. Biz har bir ishtirokchi bilan faxrlanamiz!
✨ADC International Youth Summit 2026✨
We are excited to share some of the brightest moments from one of the most large-scale and inspiring events of the year — ADC International Youth Summit 2026!
This summit brought together active and ambitious youth, leaders, speakers, and experts from different countries. Throughout these productive days, participants exchanged ideas, gained new knowledge, built valuable connections, and took important steps toward their future.
We are proud of every participant and grateful to everyone who became part of this incredible event!
#ADC#YouthSummit2026#InternationalSummit#Leadership#Education#FutureLeaders#YoshlarSammati
📞 742261078
📲 Telegram: @admofadc