Service objects designed with OOP in mind.
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>>> from dataclasses import dataclass
>>> from typing import Callable
>>> from stories import Story, I, State
>>> from app.repositories import load_order, load_customer, create_payment
>>> @dataclass
... class Purchase(Story):
... I.find_order
... I.find_customer
... I.check_balance
... I.persist_payment
...
... def find_order(self, state):
... state.order = self.load_order(state.order_id)
...
... def find_customer(self, state):
... state.customer = self.load_customer(state.customer_id)
...
... def check_balance(self, state):
... if not state.order.affordable_for(state.customer):
... raise Exception
...
... def persist_payment(self, state):
... state.payment = self.create_payment(
... order_id=state.order_id, customer_id=state.customer_id
... )
...
... load_order: Callable
... load_customer: Callable
... create_payment: Callable
>>> purchase = Purchase(
... load_order=load_order,
... load_customer=load_customer,
... create_payment=create_payment,
... )
>>> state = State(order_id=1, customer_id=1)
>>> purchase(state)
>>> state # doctest: +SKIP
>>> state.payment.was_received()
False
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