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Added docs for the error handler rework

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Phil Schaf 2015-04-11 16:57:17 +02:00
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docs/upgrading.rst
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@ -29,6 +29,21 @@ applications. Instead the new ``LOGGER_HANDLER_POLICY`` configuration can
be used to disable the default log handlers and custom log handlers can be
set up.
The behavior of error handlers was changed.
The precedence of handlers used to be based on the decoration/call order of
:meth:`~flask.Flask.errorhandler` and
:meth:`~flask.Flask.register_error_handler`, respectively.
Now the inheritance hierarchy takes precedence and handlers for more
specific exception classes are executed instead of more general ones.
See :ref:`error-handlers` for specifics.
.. note::
There used to be a logic error allowing you to register handlers
only for exception *instances*. This was unintended and plain wrong,
and therefore was replaced with the intended behavior of registering
handlers only using exception classes and HTTP error codes.
.. _upgrading-to-010:
Version 0.10