urban-meal-delivery/src/urban_meal_delivery/db/__init__.py

"""Provide the ORM models and a connection to the database."""

from urban_meal_delivery.db.addresses import Address
from urban_meal_delivery.db.addresses_pixels import AddressPixelAssociation
from urban_meal_delivery.db.cities import City
from urban_meal_delivery.db.connection import connection
from urban_meal_delivery.db.connection import engine
from urban_meal_delivery.db.connection import session
from urban_meal_delivery.db.couriers import Courier
from urban_meal_delivery.db.customers import Customer
from urban_meal_delivery.db.grids import Grid
from urban_meal_delivery.db.meta import Base
from urban_meal_delivery.db.orders import Order
from urban_meal_delivery.db.pixels import Pixel
from urban_meal_delivery.db.restaurants import Restaurant
Add an ORM layer - use SQLAlchemy (and PostgreSQL) to model the ORM layer - add the following models: + Address => modelling all kinds of addresses + City => model the three target cities + Courier => model the UDP's couriers + Customer => model the UDP's customers + Order => model the orders received by the UDP + Restaurant => model the restaurants active on the UDP - so far, the emphasis lies on expression the Foreign Key and Check Constraints that are used to validate the assumptions inherent to the cleanded data - provide database-independent unit tests with 100% coverage - provide additional integration tests ("e2e") that commit data to a PostgreSQL instance to validate that the constraints work - adapt linting rules a bit 2020-08-09 03:45:19 +02:00			`"""Provide the ORM models and a connection to the database."""`

Add ORM models for the pixel grids - add Grid, Pixel, and AddressPixelAssociation ORM models - each Grid belongs to a City an is characterized by the side_length of all the square Pixels contained in it - Pixels aggregate Addresses => many-to-many relationship (that is modeled with SQLAlchemy's Association Pattern to implement a couple of constraints) 2021-01-03 19:33:36 +01:00			`from urban_meal_delivery.db.addresses import Address`
			`from urban_meal_delivery.db.addresses_pixels import AddressPixelAssociation`
			`from urban_meal_delivery.db.cities import City`
Use globals for the database connection - remove the factory functions for creating engines and sessions - define global engine, connection, and session objects to be used everywhere in the urban_meal_delivery package 2021-01-04 18:50:26 +01:00			`from urban_meal_delivery.db.connection import connection`
			`from urban_meal_delivery.db.connection import engine`
			`from urban_meal_delivery.db.connection import session`
Add ORM models for the pixel grids - add Grid, Pixel, and AddressPixelAssociation ORM models - each Grid belongs to a City an is characterized by the side_length of all the square Pixels contained in it - Pixels aggregate Addresses => many-to-many relationship (that is modeled with SQLAlchemy's Association Pattern to implement a couple of constraints) 2021-01-03 19:33:36 +01:00			`from urban_meal_delivery.db.couriers import Courier`
			`from urban_meal_delivery.db.customers import Customer`
			`from urban_meal_delivery.db.grids import Grid`
			`from urban_meal_delivery.db.meta import Base`
			`from urban_meal_delivery.db.orders import Order`
			`from urban_meal_delivery.db.pixels import Pixel`
			`from urban_meal_delivery.db.restaurants import Restaurant`