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Add ORM models for the pixel grids

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- 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)
This commit is contained in:
Alexander Hess 2021-01-03 19:33:36 +01:00
commit f996376b13
Signed by: alexander
GPG key ID: 344EA5AB10D868E0
15 changed files with 665 additions and 36 deletions
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26
tests/db/fake_data/__init__.py
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@ -1,14 +1,16 @@
"""Fixtures for testing the ORM layer with fake data."""
from tests.db.fake_data.fixture_makers import make_address # noqa:F401
from tests.db.fake_data.fixture_makers import make_courier # noqa:F401
from tests.db.fake_data.fixture_makers import make_customer # noqa:F401
from tests.db.fake_data.fixture_makers import make_order # noqa:F401
from tests.db.fake_data.fixture_makers import make_restaurant # noqa:F401
from tests.db.fake_data.static_fixtures import address # noqa:F401
from tests.db.fake_data.static_fixtures import city # noqa:F401
from tests.db.fake_data.static_fixtures import city_data # noqa:F401
from tests.db.fake_data.static_fixtures import courier # noqa:F401
from tests.db.fake_data.static_fixtures import customer # noqa:F401
from tests.db.fake_data.static_fixtures import order # noqa:F401
from tests.db.fake_data.static_fixtures import restaurant # noqa:F401
from tests.db.fake_data.fixture_makers import make_address
from tests.db.fake_data.fixture_makers import make_courier
from tests.db.fake_data.fixture_makers import make_customer
from tests.db.fake_data.fixture_makers import make_order
from tests.db.fake_data.fixture_makers import make_restaurant
from tests.db.fake_data.static_fixtures import address
from tests.db.fake_data.static_fixtures import city
from tests.db.fake_data.static_fixtures import city_data
from tests.db.fake_data.static_fixtures import courier
from tests.db.fake_data.static_fixtures import customer
from tests.db.fake_data.static_fixtures import grid
from tests.db.fake_data.static_fixtures import order
from tests.db.fake_data.static_fixtures import pixel
from tests.db.fake_data.static_fixtures import restaurant

12
tests/db/fake_data/static_fixtures.py
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@ -56,3 +56,15 @@ def restaurant(address, make_restaurant):
def order(make_order, restaurant):
"""An `Order` object for the `restaurant`."""
return make_order(restaurant=restaurant)
@pytest.fixture
def grid(city):
"""A `Grid` with a pixel area of 1 square kilometer."""
return db.Grid(city=city, side_length=1000)
@pytest.fixture
def pixel(grid):
"""The `Pixel` in the lower-left corner of the `grid`."""
return db.Pixel(grid=grid, n_x=0, n_y=0)