from typing import List
from typing import Optional
from sqlalchemy import String
from sqlalchemy.orm import Mapped
from sqlalchemy.orm import mapped_column
from sqlalchemy.orm import relationship

from .base import Base

class Tag(Base):
    __tablename__ = "tag"
    id: Mapped[int] = mapped_column(primary_key=True)
    name: Mapped[str] = mapped_column(String(255))

    books: Mapped[List["Book"]] = relationship(
        back_populates="tags", cascade="all, delete-orphan"
    )

    def __repr__(self) -> str:
        return f"Book(id={self.id!r}, name={self.name!r}, publisher={self.publisher!r}," \
                " notes={self.notes!r}, classification={self.classification!r})"