Webargs

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Bug fixes:

* Prevent error when rendering validation errors to JSON in Flask (e.g. when using Flask-RESTful) (:issue:`122`). Thanks :user:`frol` for the catch and patch. NOTE: Though this is a bugfix, this is a potentially breaking change for code that needs to access the original ``ValidationError`` object.

.. code-block:: python

Before
app.errorhandler(422)
def handle_validation_error(err):
return jsonify({"errors": err.messages}), 422


After
app.errorhandler(422)
def handle_validation_error(err):
The marshmallow.ValidationError is available on err.exc
return jsonify({"errors": err.exc.messages}), 422

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Bug fixes:

* Fix bug in parsing form in Falcon>=1.0.

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Bug fixes:

* Fix behavior for nullable List fields (:issue:`107`). Thanks :user:`shaicantor` for reporting.

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Bug fixes:

* Fix passing a schema factory to ``use_kwargs`` (:issue:`103`). Thanks :user:`ksesong` for reporting.

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Bug fixes:

* Fix memory leak when calling ``parser.parse`` with a ``dict`` in a view (:issue:`101`). Thanks :user:`frankslaughter` for reporting.
* aiohttpparser: Fix bug in handling bulk-type arguments.

Support:

* Massive refactor of tests (:issue:`98`).
* Docs: Fix incorrect use_args example in Tornado section (:issue:`100`). Thanks :user:`frankslaughter` for reporting.
* Docs: Add "Mixing Locations" section (:issue:`90`). Thanks :user:`tuukkamustonen`.

******************

Features:

* Add bulk-type arguments support for JSON parsing by passing ``many=True`` to a ``Schema`` (:issue:`81`). Thanks :user:`frol`.

Bug fixes:

* Fix JSON parsing in Flask<=0.9.0. Thanks :user:`brettdh` for the PR.
* Fix behavior of ``status_code`` argument to ``ValidationError`` (:issue:`85`). This requires **marshmallow>=2.7.0**. Thanks :user:`ParthGandhi` for reporting.


Support:

* Docs: Add "Custom Fields" section with example of using a ``Function`` field (:issue:`94`). Thanks :user:`brettdh` for the suggestion.