我试图建立一个Pydantic模型,它在很大程度上是可变的,但我希望有一个成员是不可变的
型号
# Built In
from datetime import datetime
# 3rd Party
from pydantic import BaseModel
from pydantic import Field # https://pydantic-docs.helpmanual.io/usage/schema/#field-customisation
class Processor(BaseModel):
""" Pydantic model for a Processor object within the database. """
class Config:
"""
Model Configuration: https://pydantic-docs.helpmanual.io/usage/model_config/
"""
extra = 'forbid'
allow_mutation = True # This allows mutation, cool
validate_assignment = True
underscore_attrs_are_private = True
model: str
created_at: str = Field(default_factory=datetime.utcnow().isoformat) # I want to make sure that this can be passed but not assignable
updated_at: str
version: int = 0
expires: Optional[int] = None
我的目标是允许从对象(或默认对象)解析created_at
,但防止在创建模型后分配它
示例
example_object = {
"model": "foobar_model",
"created_at": "2020-12-22T15:35:06.262454+00:00",
"updated_at": "2020-12-22T15:35:06.262454+00:00",
"version": 2,
"expires": None
}
processor = Processor.parse_obj(example_object)
processor.version = 3 # This should be allowed
processor.created_at = datetime.utcnow().isoformat() # This I want to fail
相关但不是我要找的-GitHub:Is there a way to have a single field be static and immutable with pydantic
我最终通过以下问题的答案解决了这个问题: https://github.com/samuelcolvin/pydantic/issues/2217
以下操作不起作用:
可以将私有属性与属性装饰器结合使用。“模型”字段中不包括“私有”属性,但可以通过属性访问该属性
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