summer_course_2024/persistence/models/City.py

"""
Model representation of a City
SPDX - License - Identifier: LGPL - 3.0 - or -later
Copyright © 2022 Concordia CERC group
Project Coder Peter Yefi peteryefi@gmail.com
"""

from sqlalchemy import Column, Integer, String, Sequence, Float
from persistence.db_config import Base
from sqlalchemy.orm import relationship


class City(Base):
  """A model representation of a city

      Attributes:
          name  The name of the city.
          uid   A unique identifier for each city object
          location  The location of the building.
          country_code  The country where the city is located.
          latitude  The GPS latitude location of the city.
          longitude  The GPS longitude location of the city.
          building A relationship for fetching all buildings in the city
  """
  __tablename__ = "city"
  id = Column(Integer, Sequence('city_id_seq'), primary_key=True)
  uid = Column(String, nullable=False, unique=True)
  name = Column(String, nullable=False)
  time_zone = Column(String, nullable=True)
  country_code = Column(String, nullable=False)
  latitude = Column(Float)
  longitude = Column(Float)
  building = relationship('Building', backref='city', lazy=True, cascade="all, delete-orphan")