135 lines
4.2 KiB
Python
135 lines
4.2 KiB
Python
"""
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City repository with database CRUD operations
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SPDX - License - Identifier: LGPL - 3.0 - or -later
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Copyright © 2022 Concordia CERC group
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Project Coder Peter Yefi peteryefi@gmail.com
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"""
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import datetime
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import pickle
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from typing import Union, Dict
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from sqlalchemy import select
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from sqlalchemy.exc import SQLAlchemyError
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from hub.city_model_structure.city import City as CityHub
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from hub.hub_logger import logger
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from hub.persistence import Repository
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from hub.persistence.models import City as Model
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from hub.version import __version__
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class City(Repository):
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_instance = None
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def __init__(self, db_name: str, dotenv_path: str, app_env: str):
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super().__init__(db_name, dotenv_path, app_env)
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def __new__(cls, db_name, dotenv_path, app_env):
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"""
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Implemented for a singleton pattern
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"""
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if cls._instance is None:
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cls._instance = super(City, cls).__new__(cls)
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return cls._instance
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def insert(self, city: CityHub, application_id, user_id: int) -> Union[Model, Dict]:
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"""
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Inserts a city
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:param city: The complete city instance
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:param application_id: Application id owning the instance
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:param user_id: User id owning the instance
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:return: City and Dictionary
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"""
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try:
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db_city = Model(
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pickle.dumps(city),
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city.name,
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city.level_of_detail,
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city.climate_file,
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application_id,
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user_id,
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__version__)
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self.session.add(db_city)
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self.session.flush()
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self.session.commit()
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return db_city
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except SQLAlchemyError as err:
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logger.error(f'An error occurred while creating city: {err}')
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def update(self, city_id: int, city: CityHub):
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"""
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Updates a city name (other updates makes no sense)
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:param city_id: the id of the city to be updated
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:param city: the city object
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:return:
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"""
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try:
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now = datetime.datetime.utcnow()
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self.session.query(Model).filter(Model.id == city_id).update({'name': city.name,'updated': now})
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self.session.commit()
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except SQLAlchemyError as err:
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logger.error(f'Error while updating city: {err}')
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def delete(self, city_id: int):
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"""
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Deletes a City with the id
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:param city_id: the city id
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:return: a city
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"""
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try:
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self.session.query(Model).filter(Model.id == city_id).delete()
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self.session.commit()
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except SQLAlchemyError as err:
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logger.error(f'Error while fetching city: {err}')
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def get_by_id(self, city_id: int) -> Model:
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"""
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Fetch a City based on the id
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:param city_id: the city id
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:return: a city
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"""
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try:
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return self.session.execute(select(Model).where(Model.id == city_id)).first()[0]
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except SQLAlchemyError as err:
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logger.error(f'Error while fetching city: {err}')
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def _get_by_hub_version_and_name(self, hub_release: str, city_name: str) -> Model:
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"""
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Fetch a City based on the name and hub project
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:param hub_release: the hub release
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:param city_name: the name of the city
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:return: a city
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"""
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try:
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return self.session.execute(select(Model)
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.where(Model.hub_release == hub_release, Model.name == city_name)
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).first()
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except SQLAlchemyError as err:
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logger.error(f'Error while fetching city: {err}')
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def get_by_name(self, city_name: str) -> [Model]:
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"""
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Fetch city based on the name
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:param city_name: the name of the building
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:return: [ModelCity] with the provided name
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"""
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try:
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result_set = self.session.execute(select(Model).where(Model.name == city_name))
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return [building[0] for building in result_set]
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except SQLAlchemyError as err:
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logger.error(f'Error while fetching city by name: {err}')
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def get_by_user(self, user_id: int) -> [Model]:
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"""
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Fetch city based on the user who created it
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:param user_id: the id of the user
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:return: [ModelCity] with the provided name
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"""
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try:
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result_set = self.session.execute(select(Model).where(Model.user_id == user_id))
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return [building[0] for building in result_set]
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except SQLAlchemyError as err:
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logger.error(f'Error while fetching city by name: {err}')
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