from __future__ import annotations
from onegov.core.orm import Base
from sqlalchemy import ForeignKey
from sqlalchemy.orm import mapped_column
from sqlalchemy.orm import relationship
from sqlalchemy.orm import Mapped
from uuid import uuid4
from uuid import UUID
from typing import TYPE_CHECKING
if TYPE_CHECKING:
from onegov.election_day.models import Election
[docs]
class ElectionRelationship(Base):
""" A relationship between elections. """
[docs]
__tablename__ = 'election_relationships'
#: Identifies the relationship.
[docs]
id: Mapped[UUID] = mapped_column(
primary_key=True,
default=uuid4
)
#: The source election ID.
[docs]
source_id: Mapped[str] = mapped_column(
ForeignKey('elections.id', onupdate='CASCADE')
)
#: The target election ID.
[docs]
target_id: Mapped[str] = mapped_column(
ForeignKey('elections.id', onupdate='CASCADE'),
primary_key=True
)
#: The source election.
[docs]
source: Mapped[Election] = relationship(
foreign_keys=[source_id],
back_populates='related_elections'
)
#: The target election.
[docs]
target: Mapped[Election] = relationship(
foreign_keys=[target_id],
back_populates='referencing_elections'
)
#: the type of relationship
[docs]
type: Mapped[str | None]