def test_prefers_current_stock_batches_to_shipments():
in_stock_batch = Batch("in-stock-batch", "RETRO-CLOCK", 100, eta=None)
shipment_batch = Batch("shipment-batch", "RETRO-CLOCK", 100, eta=tomorrow)
line = OrderLine("oref", "RETRO-CLOCK", 10)
allocate(line, [in_stock_batch, shipment_batch])
assert in_stock_batch.available_quantity == 90
assert shipment_batch.available_quantity == 100
def test_prefers_earlier_batches():
earliest = Batch("speedy-batch", "RETRO-CLOCK", 100, eta=today)
medium = Batch("normal-batch", "RETRO-CLOCK", 100, eta=tomorrow)
latest = Batch("slow-batch", "RETRO-CLOCK", 100, eta=later)
line = OrderLine("oref", "RETRO-CLOCK", 10)
allocate(line, [medium, latest, earliest])
assert earliest.available_quantity == 90
assert medium.available_quantity == 100
assert latest.available_quantity == 100
def allocate(line: OrderLine, repo: AbstractRepository, session) -> str:
batches = repo.list()
if not is_valid_sku(line.sku, batches):
raise InvalidSku(f'Invalid sku {line.sku}')
batchref = model.allocate(line, batches)
session.commit()
return batchref
def test_returns_allocated_batch_ref():
in_stock_batch = Batch("in-stock-batch-ref", "HIGHBROW-POSTER", 100, eta=None)
shipment_batch = Batch("shipment-batch-ref", "HIGHBROW-POSTER", 100, eta=tomorrow)
line = OrderLine("oref", "HIGHBROW-POSTER", 10)
allocation = allocate(line, [in_stock_batch, shipment_batch])
assert allocation == in_stock_batch.reference
def test_returns_allocated_batch_ref():
in_stock_batch = Batch("in-stock-batch", "RETRO-CLOCK", 100, eta=None)
shipment_batch = Batch("shipment-batch", "RETRO-CLOCK", 100, eta=tomorrow)
line = OrderLine("oref", "RETRO-CLOCK", 10)
result = allocate(line, [in_stock_batch, shipment_batch])
assert result == in_stock_batch.reference
def allocate(
orderid: str, sku: str, qty: int, repo: AbstractRepository, session
) -> str:
line = OrderLine(orderid, sku, qty)
batches = repo.list()
if not is_valid_sku(line.sku, batches):
raise InvalidSku(f'Invalid sku {line.sku}')
batchref = model.allocate(line, batches)
session.commit()
return batchref
def allocate(
orderid: str, sku: str, qty: int,
uow: unit_of_work.AbstractUnitOfWork,
) -> str:
line = OrderLine(orderid, sku, qty)
with uow:
batches = uow.batches.list()
if not is_valid_sku(line.sku, batches):
raise InvalidSku(f'Invalid sku {line.sku}')
batchref = model.allocate(line, batches)
uow.commit()
return batchref
def test_raises_out_of_stock_exception_if_cannot_allocate():
batch = Batch('batch1', 'SMALL-FORK', 10, eta=today)
allocate(OrderLine('order1', 'SMALL-FORK', 10), [batch])
with pytest.raises(OutOfStock, match='SMALL-FORK'):
allocate(OrderLine('order2', 'SMALL-FORK', 1), [batch])