Pydantic Discarded Extra Argument

What it does

Checks for extra keyword arguments that Pydantic silently discards when a model uses extra="ignore", either implicitly or explicitly.

Why is this bad?

A discarded argument has no effect on the constructed model, but it may indicate a misspelled field name or an incorrect assumption about the model's schema.

Example

from pydantic import BaseModel


class User(BaseModel):
    name: str
    admin: bool = False


user = User(name="Alice", admni=True)  # error: [pydantic-discarded-extra-argument]

If the field name has been misspelled, fix the typo. Otherwise, consider removing the extra argument, or explicitly configure the model with extra="allow".