1.4a1 (2012-09-16)
==================

Bug Fixes
---------

- Forward port from 1.3 branch: When no authentication policy was configured,
  a call to ``pyramid.security.effective_principals`` would unconditionally
  return the empty list.  This was incorrect, it should have unconditionally
  returned ``[Everyone]``, and now does.

- Explicit url dispatch regexes can now contain colons.
  https://github.com/Pylons/pyramid/issues/629

- On at least one 64-bit Ubuntu system under Python 3.2, using the
  ``view_config`` decorator caused a ``RuntimeError: dictionary changed size
  during iteration`` exception.  It no longer does.  See
  https://github.com/Pylons/pyramid/issues/635 for more information.

- In Mako Templates lookup, check if the uri is already adjusted and bring
  it back to an asset spec. Normally occurs with inherited templates or
  included components.
  https://github.com/Pylons/pyramid/issues/606
  https://github.com/Pylons/pyramid/issues/607

- In Mako Templates lookup, check for absolute uri (using mako directories) 
  when mixing up inheritance with asset specs.
  https://github.com/Pylons/pyramid/issues/662

- HTTP Accept headers were not being normalized causing potentially
  conflicting view registrations to go unnoticed. Two views that only
  differ in the case ('text/html' vs. 'text/HTML') will now raise an error.
  https://github.com/Pylons/pyramid/pull/620

- Forward-port from 1.3 branch: when registering multiple views with an
  ``accept`` predicate in a Pyramid application runing under Python 3, you
  might have received a ``TypeError: unorderable types: function() <
  function()`` exception.

Features
--------

- Configurator.add_directive now accepts arbitrary callables like partials or
  objects implementing ``__call__`` which dont have ``__name__`` and
  ``__doc__`` attributes.  See https://github.com/Pylons/pyramid/issues/621
  and https://github.com/Pylons/pyramid/pull/647.

- Third-party custom view, route, and subscriber predicates can now be added
  for use by view authors via
  ``pyramid.config.Configurator.add_view_predicate``,
  ``pyramid.config.Configurator.add_route_predicate`` and
  ``pyramid.config.Configurator.add_subscriber_predicate``.  So, for example,
  doing this::

     config.add_view_predicate('abc', my.package.ABCPredicate)

  Might allow a view author to do this in an application that configured that
  predicate::

     @view_config(abc=1)

  Similar features exist for ``add_route``, and ``add_subscriber``.  See
  "Adding A Third Party View, Route, or Subscriber Predicate" in the Hooks
  chapter for more information.

  Note that changes made to support the above feature now means that only
  actions registered using the same "order" can conflict with one another.
  It used to be the case that actions registered at different orders could
  potentially conflict, but to my knowledge nothing ever depended on this
  behavior (it was a bit silly).

- Custom objects can be made easily JSON-serializable in Pyramid by defining
  a ``__json__`` method on the object's class. This method should return
  values natively serializable by ``json.dumps`` (such as ints, lists,
  dictionaries, strings, and so forth).

- The JSON renderer now allows for the definition of custom type adapters to
  convert unknown objects to JSON serializations.

- As of this release, the ``request_method`` predicate, when used, will also
  imply that ``HEAD`` is implied when you use ``GET``.  For example, using
  ``@view_config(request_method='GET')`` is equivalent to using
  ``@view_config(request_method=('GET', 'HEAD'))``.  Using
  ``@view_config(request_method=('GET', 'POST')`` is equivalent to using
  ``@view_config(request_method=('GET', 'HEAD', 'POST')``.  This is because
  HEAD is a variant of GET that omits the body, and WebOb has special support
  to return an empty body when a HEAD is used.

- ``config.add_request_method`` has been introduced to support extending
  request objects with arbitrary callables. This method expands on the
  previous ``config.set_request_property`` by supporting methods as well as
  properties. This method now causes less code to be executed at
  request construction time than ``config.set_request_property`` in
  version 1.3.

- Don't add a ``?`` to URLs generated by ``request.resource_url`` if the
  ``query`` argument is provided but empty.

- Don't add a ``?`` to URLs generated by ``request.route_url`` if the
  ``_query`` argument is provided but empty.

- The static view machinery now raises (rather than returns) ``HTTPNotFound``
  and ``HTTPMovedPermanently`` exceptions, so these can be caught by the
  NotFound view (and other exception views).

- The Mako renderer now supports a def name in an asset spec.  When the def
  name is present in the asset spec, the system will render the template def
  within the template and will return the result. An example asset spec is
  ``package:path/to/template#defname.mako``. This will render the def named
  ``defname`` inside the ``template.mako`` template instead of rendering the
  entire template.  The old way of returning a tuple in the form
  ``('defname', {})`` from the view is supported for backward compatibility,

- The Chameleon ZPT renderer now accepts a macro name in an asset spec.  When
  the macro name is present in the asset spec, the system will render the
  macro listed as a ``define-macro`` and return the result instead of
  rendering the entire template.  An example asset spec:
  ``package:path/to/template#macroname.pt``.  This will render the macro
  defined as ``macroname`` within the ``template.pt`` template instead of the
  entire templae.

- When there is a predicate mismatch exception (seen when no view matches for
  a given request due to predicates not working), the exception now contains
  a textual description of the predicate which didn't match.

- An ``add_permission`` directive method was added to the Configurator.  This
  directive registers a free-standing permission introspectable into the
  Pyramid introspection system.  Frameworks built atop Pyramid can thus use
  the the ``permissions`` introspectable category data to build a
  comprehensive list of permissions supported by a running system.  Before
  this method was added, permissions were already registered in this
  introspectable category as a side effect of naming them in an ``add_view``
  call, this method just makes it possible to arrange for a permission to be
  put into the ``permissions`` introspectable category without naming it
  along with an associated view.  Here's an example of usage of
  ``add_permission``::

      config = Configurator()
      config.add_permission('view')

- The ``UnencryptedCookieSessionFactoryConfig`` now accepts
  ``signed_serialize`` and ``signed_deserialize`` hooks which may be used
  to influence how the sessions are marshalled (by default this is done
  with HMAC+pickle).

- ``pyramid.testing.DummyRequest`` now supports methods supplied by the
  ``pyramid.util.InstancePropertyMixin`` class such as ``set_property``.

- Request properties and methods added via ``config.set_request_property`` or
  ``config.add_request_method`` are now available to tweens.

- Request properties and methods added via ``config.set_request_property`` or
  ``config.add_request_method`` are now available in the request object
  returned from ``pyramid.paster.bootstrap``.

- ``request.context`` of environment request during ``bootstrap`` is now the
  root object if a context isn't already set on a provided request.

- The ``pyramid.decorator.reify`` function is now an API, and was added to
  the API documentation.

- Added the ``pyramid.testing.testConfig`` context manager, which can be used
  to generate a configurator in a test, e.g. ``with testing.testConfig(...):``.

- Users can now invoke a subrequest from within view code using a new
  ``request.invoke_subrequest`` API.

Deprecations
------------

- The ``pyramid.config.Configurator.set_request_property`` has been
  documentation-deprecated.  The method remains usable but the more
  featureful ``pyramid.config.Configurator.add_request_method`` should be
  used in its place (it has all of the same capabilities but can also extend
  the request object with methods).

Backwards Incompatibilities
---------------------------

- The Pyramid router no longer adds the values ``bfg.routes.route`` or
  ``bfg.routes.matchdict`` to the request's WSGI environment dictionary.
  These values were docs-deprecated in ``repoze.bfg`` 1.0 (effectively seven
  minor releases ago).  If your code depended on these values, use
  request.matched_route and request.matchdict instead.

- It is no longer possible to pass an environ dictionary directly to
  ``pyramid.traversal.ResourceTreeTraverser.__call__`` (aka
  ``ModelGraphTraverser.__call__``).  Instead, you must pass a request
  object.  Passing an environment instead of a request has generated a
  deprecation warning since Pyramid 1.1.

- Pyramid will no longer work properly if you use the
  ``webob.request.LegacyRequest`` as a request factory.  Instances of the
  LegacyRequest class have a ``request.path_info`` which return a string.
  This Pyramid release assumes that ``request.path_info`` will
  unconditionally be Unicode.

- The functions from ``pyramid.chameleon_zpt`` and ``pyramid.chameleon_text``
  named ``get_renderer``, ``get_template``, ``render_template``, and
  ``render_template_to_response`` have been removed.  These have issued a
  deprecation warning upon import since Pyramid 1.0.  Use
  ``pyramid.renderers.get_renderer()``,
  ``pyramid.renderers.get_renderer().implementation()``,
  ``pyramid.renderers.render()`` or ``pyramid.renderers.render_to_response``
  respectively instead of these functions.

- The ``pyramid.configuration`` module was removed.  It had been deprecated
  since Pyramid 1.0 and printed a deprecation warning upon its use.  Use
  ``pyramid.config`` instead.

- The ``pyramid.paster.PyramidTemplate`` API was removed.  It had been
  deprecated since Pyramid 1.1 and issued a warning on import.  If your code
  depended on this, adjust your code to import
  ``pyramid.scaffolds.PyramidTemplate`` instead.

- The ``pyramid.settings.get_settings()`` API was removed.  It had been
  printing a deprecation warning since Pyramid 1.0.  If your code depended on
  this API, use ``pyramid.threadlocal.get_current_registry().settings``
  instead or use the ``settings`` attribute of the registry available from
  the request (``request.registry.settings``).

- These APIs from the ``pyramid.testing`` module were removed.  They have
  been printing deprecation warnings since Pyramid 1.0:

  * ``registerDummySecurityPolicy``, use
    ``pyramid.config.Configurator.testing_securitypolicy`` instead.

  * ``registerResources`` (aka ``registerModels``, use
    ``pyramid.config.Configurator.testing_resources`` instead.

  * ``registerEventListener``, use
    ``pyramid.config.Configurator.testing_add_subscriber`` instead.

  * ``registerTemplateRenderer`` (aka `registerDummyRenderer``), use
    ``pyramid.config.Configurator.testing_add_template`` instead.

  * ``registerView``, use ``pyramid.config.Configurator.add_view`` instead.

  * ``registerUtility``, use
    ``pyramid.config.Configurator.registry.registerUtility`` instead.

  * ``registerAdapter``, use
    ``pyramid.config.Configurator.registry.registerAdapter`` instead.

  * ``registerSubscriber``, use 
    ``pyramid.config.Configurator.add_subscriber`` instead.

  * ``registerRoute``, use 
    ``pyramid.config.Configurator.add_route`` instead.

  * ``registerSettings``, use 
    ``pyramid.config.Configurator.add_settings`` instead.

- In Pyramid 1.3 and previous, the ``__call__`` method of a Response object
  was invoked before any finished callbacks were executed.  As of this
  release, the ``__call__`` method of a Response object is invoked *after*
  finished callbacks are executed.  This is in support of the
  ``request.invoke_subrequest`` feature.

Documentation
-------------

- Added an "Upgrading Pyramid" chapter to the narrative documentation.  It
  describes how to cope with deprecations and removals of Pyramid APIs and
  how to show Pyramid-generated deprecation warnings while running tests and
  while running a server.

- Added a "Invoking a Subrequest" chapter to the documentation.  It describes
  how to use the new ``request.invoke_subrequest`` API.

Dependencies
------------

- Pyramid now requires WebOb 1.2b3+ (the prior Pyramid release only relied on
  1.2dev+).  This is to ensure that we obtain a version of WebOb that returns
  ``request.path_info`` as text.

