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Default; BFG Does Not" to the "Design Defense" chapter.
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decorator decorates module-scope functions, which are then treated
as event listeners after a scan() is performed. See the Events
narrative documentation chapter and the ``repoze.bfg.events`` module
documentation for more information.
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exist" meaning, temporally, a view was added with a route name for a
route which had not yet been added via add_route), the value of the
``custom_predicate`` argument to ``add_view`` was lost. Symptom:
wrong view matches when using URL dispatch and custom view
predicates together.
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returns the route object that was added.
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``set_request_factory``. If used, this method will set the factory
used by the :mod:`repoze.bfg` router to create all request objects.
- The ``Configurator`` constructor takes an additional argument:
``request_factory``. If used, this argument will set the factory
used by the :mod:`repoze.bfg` router to create all request objects.
- The ``Hooks`` narrative chapter now contains a section about
changing the request factory.
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``traverse`` route argument.
- Fix route ZCML directive to use traverse.
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and the ``route`` ZCML directive: ``traverse``. If you would like
to cause the ``context`` to be something other than the ``root``
object when this route matches, you can spell a traversal pattern as
the ``traverse`` argument. This traversal pattern will be used as
the traversal path: traversal will begin at the root object implied
by this route (either the global root, or the object returned by the
``factory`` associated with this route).
The syntax of the ``traverse`` argument is the same as it is for
``path``. For example, if the ``path`` provided is
``articles/:article/edit``, and the ``traverse`` argument provided
is ``/:article``, when a request comes in that causes the route to
match in such a way that the ``article`` match value is '1' (when
the request URI is ``/articles/1/edit``), the traversal path will be
generated as ``/1``. This means that the root object's
``__getitem__`` will be called with the name ``1`` during the
traversal phase. If the ``1`` object exists, it will become the
``context`` of the request. The Traversal narrative has more
information about traversal.
If the traversal path contains segment marker names which are not
present in the path argument, a runtime error will occur. The
``traverse`` pattern should not contain segment markers that do not
exist in the ``path``.
A similar combining of routing and traversal is available when a
route is matched which contains a ``*traverse`` remainder marker in
its path. The ``traverse`` argument allows you to associate route
patterns with an arbitrary traversal path without using a a
``*traverse`` remainder marker; instead you can use other match
information.
Note that the ``traverse`` argument is ignored when attached to a
route that has a ``*traverse`` remainder marker in its path.
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``repoze.bfg.exceptions.PredicateMismatch`` now exists. This
exception is currently raised when no constituent view of a
multiview can be called (due to no predicate match). Previously, in
this situation, a ``repoze.bfg.exceptions.NotFound`` was raised. We
provide backwards compatibility for code that expected a
``NotFound`` to be raised when no predicates match by causing
``repoze.bfg.exceptions.PredicateMismatch`` to inherit from
``NotFound``. This will cause any exception view registered for
``NotFound`` to be called when a predicate mismatch occurs, as was
the previous behavior.
There is however, one perverse case that will expose a backwards
incompatibility. If 1) you had a view that was registered as a
member of a multiview 2) this view explicitly raised a ``NotFound``
exception *in order to* proceed to the next predicate check in the
multiview, that code will now behave differently: rather than
skipping to the next view match, a NotFound will be raised to the
top-level exception handling machinery instead. For code to be
depending upon the behavior of a view raising ``NotFound`` to
proceed to the next predicate match, would be tragic, but not
impossible, given that ``NotFound`` is a public interface.
``repoze.bfg.exceptions.PredicateMismatch`` is not a public API and
cannot be depended upon by application code, so you should not
change your view code to raise ``PredicateMismatch``. Instead, move
the logic which raised the ``NotFound`` exception in the view out
into a custom view predicate.
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--------
- New view predicate: match_val. The ``match_val`` value represents
the presence of a value in the structure added to the request named
``matchdict`` during URL dispatch representing the match values from
the route pattern (e.g. if the route pattern has ``:foo`` in it, and
the route matches, a key will exist in the matchdict named ``foo``).
Like all other view predicates, this feature is exposed via the
``bfg_view`` API, the Configurator ``add_view`` API, and the ZCML
``view`` directive.
Documentation
-------------
- API documentation for the ``add_view`` method of the configurator
changed to include ``match_val``.
- ZCML documentation for ``view`` ZCML directive changed to include
``match_val``.
- The ``Views`` narrative chapter now contains a description of the
``match_val`` predicate.
Bug Fixes
---------
- The ``header`` predicate (when used as either a view predicate or a
route predicate) had a problem when specified with a name/regex
pair. When the header did not exist in the headers dictionary, the
regex match could be fed ``None``, causing it to throw a
``TypeError: expected string or buffer`` exception. Now, the
predicate returns False as intended.
Internal
--------
- Remove ``repoze.bfg.configuration.isclass`` function in favor of
using ``inspect.isclass``.
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This URL is a subclass of the built-in Python exception named
``UnicodeDecodeError``.
- When decoding a URL segment to Unicode fails, the exception raised
is now ``repoze.bfg.exceptions.URLDecodeError`` instead of
``UnicodeDecodeError``. This makes it possible to register an
exception view invoked specifically when ``repoze.bfg`` cannot
decode a URL.
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``repoze.bfg.configuration.Configurator.add_static_view``. Before
1.3a4, view names that contained a slash were supported as route
prefixes. 1.3a4 broke this by trying to treat them as full URLs.
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``_app_url`` is present in the arguments passed to ``route_url``,
this value will be used as the protocol/hostname/port/leading path
prefix of the generated URL. For example, using an ``_app_url`` of
``http://example.com:8080/foo`` would cause the URL
``http://example.com:8080/foo/fleeb/flub`` to be returned from this
function if the expansion of the route pattern associated with the
``route_name`` expanded to ``/fleeb/flub``.
- It is now possible to use a URL as the ``name`` argument fed to
``repoze.bfg.configuration.Configurator.add_static_view``. When the
name argument is a URL, the ``repoze.bfg.url.static_url`` API will
generate join this URL (as a prefix) to a path including the static
file name. This makes it more possible to put static media on a
separate webserver for production, while keeping static media
package-internal and served by the development webserver during
development.
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information
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