pydantic-models-py/examples/api_contract.py

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"""BB Skills synthetic API contract. MIT; not part of the Microsoft template."""
from pydantic import ConfigDict, BaseModel, Field


class PatchProject(BaseModel):
    model_config = ConfigDict(extra='forbid')
    name: str | None = Field(default=None, min_length=1, max_length=200)
    description: str | None = Field(default=None, max_length=2000)


def apply_patch(existing, incoming, create_model):
    """Allow only editable fields; revalidate after applying an explicit patch.

    An omitted description is preserved; explicit None clears it. A project name
    remains required after merging. Callers must separately enforce ownership,
    authorization, concurrency and persistence before accepting any write.
    """
    patch = PatchProject.model_validate(incoming).model_dump(exclude_unset=True)
    merged = {**existing, **patch}
    return create_model.model_validate(merged)