Marshmallow

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Bug fixes:

- Fix inheritance of ``ordered`` class Meta option (:issue:`162`). Thanks :user:`stephenfin` for reporting.

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Bug fixes:

- Fix behavior of ``skip_missing`` and ``accessor`` options when ``many=True`` (:issue:`137`). Thanks :user:`3rdcycle`.
- Fix bug that could cause an ``AttributeError`` when nesting schemas with schema-level validators (:issue:`144`). Thanks :user:`vovanbo` for reporting.

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Bug fixes:

- A ``Schema's`` ``error_handler``--if defined--will execute if ``Schema.validate`` returns validation errors (:issue:`121`).
- Deserializing `None` returns `None` rather than raising an ``AttributeError`` (:issue:`123`). Thanks :user:`RealSalmon` for the catch and patch.

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Features:

- Add ``QuerySelect`` and ``QuerySelectList`` fields (:issue:`84`).
- Convert validators in ``marshmallow.validate`` into class-based callables to make them easier to use when declaring fields (:issue:`85`).
- Add ``Decimal`` field which is safe to use when dealing with precise numbers (:issue:`86`).

Thanks :user:`philtay` for these contributions.

Bug fixes:

- ``Date`` fields correctly deserializes to a ``datetime.date`` object when ``python-dateutil`` is not installed (:issue:`79`). Thanks :user:`malexer` for the catch and patch.
- Fix bug that raised an ``AttributeError`` when using a class-based validator.
- Fix ``as_string`` behavior of Number fields when serializing to default value.
- Deserializing ``None`` or the empty string with either a ``DateTime``, ``Date``, ``Time`` or ``TimeDelta`` results in the correct unmarshalling errors (:issue:`96`). Thanks :user:`svenstaro` for reporting and helping with this.
- Fix error handling when deserializing invalid UUIDs (:issue:`106`). Thanks :user:`vesauimonen` for the catch and patch.
- ``Schema.loads`` correctly defaults to use the value of ``self.many`` rather than defaulting to ``False`` (:issue:`108`). Thanks :user:`davidism` for the catch and patch.
- Validators, data handlers, and preprocessors are no longer shared between schema subclasses (:issue:`88`). Thanks :user:`amikholap` for reporting.
- Fix error handling when passing a ``dict`` or ``list`` to a ``ValidationError`` (:issue:`110`). Thanks :user:`ksesong` for reporting.

Deprecation:

- The validator functions in the ``validate`` module are deprecated in favor of the class-based validators (:issue:`85`).
- The ``Arbitrary``, ``Price``, and ``Fixed`` fields are deprecated in favor of the ``Decimal`` field (:issue:`86`).

Support:

- Update docs theme.
- Update contributing docs (:issue:`77`).
- Fix namespacing example in "Extending Schema" docs. Thanks :user:`Ch00k`.
- Exclude virtualenv directories from syntax checking (:issue:`99`). Thanks :user:`svenstaro`.

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Features:

- Add ``Schema.validate`` method which validates input data against a schema. Similar to ``Schema.load``, but does not call ``make_object`` and only returns the errors dictionary.
- Add several validation functions to the ``validate`` module. Thanks :user:`philtay`.
- Store field name and instance on exceptions raised in ``strict`` mode.

Bug fixes:

- Fix serializing dictionaries when field names are methods of ``dict`` (e.g. ``"items"``). Thanks :user:`rozenm` for reporting.
- If a Nested field is passed ``many=True``, ``None`` serializes to an empty list. Thanks :user:`nickretallack` for reporting.
- Fix behavior of ``many`` argument passed to ``dump`` and ``load``. Thanks :user:`svenstaro` for reporting and helping with this.
- Fix ``skip_missing`` behavior for ``String`` and ``List`` fields. Thanks :user:`malexer` for reporting.
- Fix compatibility with python-dateutil 2.3.
- More consistent error messages across ``DateTime``, ``TimeDelta``, ``Date``, and ``Time`` fields.

Support:

- Update Flask and Peewee examples.

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Hotfix release.

- Ensure that errors dictionary is correctly cleared on each call to ``Schema.dump`` and ``Schema.load``.