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api	[ DIR ]	drwxr-xr-x
Makefile	5.46 KB	-rw-r--r--
README.rst	24.55 KB	-rw-r--r--
README.ru.rst	33.18 KB	-rw-r--r--
adapter.rst	16.12 KB	-rw-r--r--
adapter.ru.rst	20.67 KB	-rw-r--r--
changes.rst	28 B	-rw-r--r--
conf.py	8.41 KB	-rw-r--r--
foodforthought.rst	1.7 KB	-rw-r--r--
hacking.rst	9.29 KB	-rw-r--r--
human.rst	6.39 KB	-rw-r--r--
human.ru.rst	10.43 KB	-rw-r--r--
index.rst	639 B	-rw-r--r--
make.bat	4.99 KB	-rw-r--r--
verify.rst	3.53 KB	-rw-r--r--

Code Editor : foodforthought.rst

================================
Food-based subscription examples
================================

This file gives more subscription examples using a cooking-based example:

.. doctest::

>>> from zope.interface.adapter import AdapterRegistry
    >>> registry = AdapterRegistry()

>>> import zope.interface
    >>> class IAnimal(zope.interface.Interface):
    ...     pass
    >>> class IPoultry(IAnimal):
    ...     pass
    >>> class IChicken(IPoultry):
    ...     pass
    >>> class ISeafood(IAnimal):
    ...     pass

Adapting to some other interface for which there is no
subscription adapter returns an empty sequence:

.. doctest::

>>> class IRecipe(zope.interface.Interface):
    ...     pass
    >>> class ISausages(IRecipe):
    ...     pass
    >>> class INoodles(IRecipe):
    ...     pass
    >>> class IKFC(IRecipe):
    ...     pass

>>> list(registry.subscriptions([IPoultry], IRecipe))
    []

unless we define a subscription:

.. doctest::

>>> registry.subscribe([IAnimal], ISausages, 'sausages')
    >>> list(registry.subscriptions([IPoultry], ISausages))
    ['sausages']

And define another subscription adapter:

.. doctest::

>>> registry.subscribe([IPoultry], INoodles, 'noodles')
    >>> meals = list(registry.subscriptions([IPoultry], IRecipe))
    >>> meals.sort()
    >>> meals
    ['noodles', 'sausages']

>>> registry.subscribe([IChicken], IKFC, 'kfc')
    >>> meals = list(registry.subscriptions([IChicken], IRecipe))
    >>> meals.sort()
    >>> meals
    ['kfc', 'noodles', 'sausages']

And the answer for poultry hasn't changed:

.. doctest::

>>> meals = list(registry.subscriptions([IPoultry], IRecipe))
    >>> meals.sort()
    >>> meals
    ['noodles', 'sausages']

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Code Editor : foodforthought.rst