forked from s_ranjbar/city_retrofit
125 lines
4.5 KiB
Python
125 lines
4.5 KiB
Python
"""
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City Object 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 Guille Gutierrez Guillermo.GutierrezMorote@concordia.ca
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"""
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import datetime
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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.hub_logger import logger
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from hub.persistence import Repository
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from hub.persistence.models import CityObject as Model
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from hub.city_model_structure.building import Building
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class CityObject(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(CityObject, cls).__new__(cls)
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return cls._instance
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def insert(self, city_id:int, building: Building) -> Union[Model, Dict]:
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"""
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Inserts a new city object
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:param city_id: city id for the city owning this city object
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:param building: the city object (only building for now) to be inserted
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return CityObject model and dictionary
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"""
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city_object = self.get_by_name_and_city(building.name, city_id)
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if city_object is None:
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try:
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object_usage = ''
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for internal_zone in building.internal_zones:
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for usage in internal_zone.usages:
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object_usage = f'{object_usage}{usage.name}_{usage.percentage} '
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object_usage = object_usage.rstrip()
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city_object = Model(city_id=city_id,
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name=building.name,
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alias=building.alias,
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object_type=building.type,
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year_of_construction=building.year_of_construction,
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function=building.function,
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usage=object_usage,
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volume=building.volume,
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area=building.floor_area)
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self.session.add(city_object)
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self.session.flush()
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self.session.commit()
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return city_object
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except SQLAlchemyError as err:
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logger.error(f'An error occurred while creating city_object: {err}')
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else:
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return {'message': f'A city_object named {building.name} already exists in that city'}
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def update(self,city_id: int, building: Building) -> Union[Dict, None]:
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"""
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Updates an application
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:param city_id: the city id of the city owning the city object
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:param building: the city object
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:return:
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"""
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try:
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object_usage = ''
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for internal_zone in building.internal_zones:
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for usage in internal_zone.usages:
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object_usage = f'{object_usage}{usage.name}_{usage.percentage} '
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object_usage = object_usage.rstrip()
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self.session.query(Model).filter(Model.name == building.name, Model.city_id == city_id).update(
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{'name': building.name,
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'alias': building.alias,
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'object_type': building.type,
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'year_of_construction': building.year_of_construction,
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'function': building.function,
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'usage': object_usage,
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'volume': building.volume,
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'area': building.floor_area,
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'updated': datetime.datetime.utcnow()})
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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 object: {err}')
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return {'message': 'Error occurred while updating application'}
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def delete(self, city_id: int, name: str):
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"""
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Deletes an application with the application_uuid
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:param city_id: The id for the city owning the city object
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:param name: The city object name
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:return: None
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"""
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try:
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self.session.query(Model).filter(Model.city_id == city_id, Model.name == name).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 deleting application: {err}')
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def get_by_name_and_city(self, name, city_id) -> [Model]:
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"""
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Fetch a city object based on name and city id
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:param name: city object name
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:param city_id: a city identifier
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:return: [CityObject] with the provided name belonging to the city with id city_id
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"""
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try:
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_city_object = self.session.execute(select(Model).where(
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Model.name == name, Model.city_id == city_id
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)).first()
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if _city_object is None:
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return None
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return _city_object[0]
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except SQLAlchemyError as err:
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print(err)
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logger.error(f'Error while fetching application by application_uuid: {err}')
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