"""# Summary

Parents persistence ports — integer-id document and repository factory.
"""
from mongo_ops import BaseDocument
from pydantic import Field

from config import settings
from domain.parents.models import Parent
from infra.db.repos import create_repo


class ParentDocument(Parent, BaseDocument):
    """Persisted parent document. The integer ``id`` shadows the ObjectId."""

    id: int | None = Field(default=None, validation_alias="_id")


def create_parent_repo():
    """Create the parent repository selected by ``settings.repo_backend``.

    Returns:
        IntIdMemoryRepository | IntIdMongoRepository: Repository wired to the
        ``parents`` collection/store.
    """
    _ = settings  # backend chosen centrally by create_repo
    return create_repo("parents", ParentDocument)