stories 0.13.0

Define a user story in the business transaction DSL

---

The business transaction DSL

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Installation

All released versions are hosted on the Python Package Index. You can install this package with following command.

pip install stories

Usage

stories provide a simple way to define a complex business scenario that include many processing steps.

>>> from stories import story, arguments, Success, Failure, Result
>>> from django_project.models import Category, Profile, Subscription

>>> class Subscribe:
...
...     @story
...     @arguments('category_id', 'profile_id')
...     def buy(I):
...
...         I.find_category
...         I.find_profile
...         I.check_balance
...         I.persist_subscription
...         I.show_subscription
...
...     def find_category(self, ctx):
...
...         ctx.category = Category.objects.get(pk=ctx.category_id)
...         return Success()
...
...     def find_profile(self, ctx):
...
...         ctx.profile = Profile.objects.get(pk=ctx.profile_id)
...         return Success()
...
...     def check_balance(self, ctx):
...
...         if ctx.category.cost < ctx.profile.balance:
...             return Success()
...         else:
...             return Failure()
...
...     def persist_subscription(self, ctx):
...
...         ctx.subscription = Subscription(category=ctx.category, profile=ctx.profile)
...         ctx.subscription.save()
...         return Success()
...
...     def show_subscription(self, ctx):
...
...         return Result(ctx.subscription)

>>> Subscribe().buy(category_id=1, profile_id=1)
<Subscription: Subscription object (8)>

This code style allow you clearly separate actual business scenario from implementation details.

License

Stories library is offered under the two clause BSD license.