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Изворен канал @pythonotes · Post #397 · 12 ное.
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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@giiveaways · Post #3165 · 22.09.2024 г., 07:02
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@giiveaways · Post #3247 · 18.10.2024 г., 07:31
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@giiveaways · Post #3244 · 14.10.2024 г., 07:40
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@giiveaways · Post #3241 · 12.10.2024 г., 07:50
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@giiveaways · Post #3235 · 11.10.2024 г., 08:14
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@giiveaways · Post #3231 · 10.10.2024 г., 07:39
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@giiveaways · Post #3230 · 09.10.2024 г., 07:35
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@giiveaways · Post #3224 · 08.10.2024 г., 07:44
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@giiveaways · Post #3220 · 07.10.2024 г., 10:42
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@giiveaways · Post #3175 · 23.09.2024 г., 07:31
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@giiveaways · Post #3163 · 22.09.2024 г., 07:01
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@giiveaways · Post #3140 · 19.09.2024 г., 13:38
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