Cast json with key CamelCase to snake_case class in pydantic

When implementing using an external API, the REST API return value may be CamelCase json. For example, it happens frequently when operating AWS with boto3 in Python.

That would be a bit of a problem considering the Python coding conventions, but pydantic uses the ʻalias_generator` function. (: //pydantic-docs.helpmanual.io/usage/model_config/#alias-generator) and you can easily cast to a snake_case keyed type.

In the documentation, I made my own function called to_camel, but I have an external library ʻinflection` for use in various classes in AWS operations. I am using.

from pydantic import BaseModel
from inflection import camelize


class Voice(BaseModel):
    name: str
    language_code: str

    class Config:
        alias_generator = camelize


voice = Voice(**{'Name': 'Filiz', 'LanguageCode': 'tr-TR'})
print(voice.language_code)
#> tr-TR
print(voice.dict(by_alias=True))
#> {'Name': 'Filiz', 'LanguageCode': 'tr-TR'}

reference

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