zopefoundation / grokcore.viewlet / 5776423262

"""

Viewlets and viewlet managers auto-associate with the context object that

may be in a module.

Set up the model object to view::

  >>> root = getRootFolder()

  >>> root['cave'] = cave = Cave()

We also set up another model that the viewlet manager and viewlets should

not be associated with::

  >>> from .viewlet_context2 import Club

  >>> root['club'] = club = Club()

Let's get a viewletmanager associated with ``cave``::

  >>> from zope.publisher.browser import TestRequest

  >>> request = TestRequest()

  >>> from zope import component

  >>> view = component.getMultiAdapter((cave, request), name='index')

  >>> from zope.contentprovider.interfaces import IContentProvider

  >>> mgr = component.getMultiAdapter((cave, request, view), IContentProvider,

  ...   'manage.cavemen')

We cannot get this viewletmanager for ``club``, as there is no viewlet

manager associated with that as a context::

  >>> component.queryMultiAdapter((club, request, view), IContentProvider,

  ...   'manage.caveman') is None

  True

We can get the viewlet for ``cave``::

  >>> mgr['fredviewlet']

  <grokcore.viewlet.tests.functional.viewlet.viewlet_context.FredViewlet object at ...>

We can also directly look it up using a manual lookup::

  >>> from zope.viewlet.interfaces import IViewlet

  >>> viewlet = component.getMultiAdapter((cave, request, view, mgr),

  ...   IViewlet, name='fredviewlet')

We cannot get the viewlet for the ``club`` however, as it is not associated

with the same context::

  >>> viewlet = component.getMultiAdapter((club, request, view, mgr),

  ...   IViewlet, name='fredviewlet')

  Traceback (most recent call last):

    ...

  zope.interface.interfaces.ComponentLookupError: ...

"""  # noqa: E501 line too long