Marshmallow

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Features:

- Add ``skip_on_field_errors`` parameter to ``validates_schema`` (:issue:`323`). Thanks :user:`jjvattamattom` for the suggestion and :user:`d-sutherland` for the PR.

Bug fixes:

- Fix ``FormattedString`` serialization (:issue:`348`). Thanks :user:`acaird` for reporting.
- Fix ``validates`` behavior when used when ``attribute`` is specified and ``strict=True`` (:issue:`350`). Thanks :user:`density` for reporting.

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Features:

- Add ``dump_to`` parameter to fields (:issue:`310`). Thanks :user:`ShayanArmanPercolate` for the suggestion. Thanks :user:`franciscod` and :user:`ewang` for the PRs.
- The ``deserialize`` function passed to ``fields.Function`` can optionally receive a ``context`` argument (:issue:`324`). Thanks :user:`DamianHeard`.
- The ``serialize`` function passed to ``fields.Function`` is optional (:issue:`325`). Thanks again :user:`DamianHeard`.
- The ``serialize`` function passed to ``fields.Method`` is optional (:issue:`329`). Thanks :user:`justanr`.

Deprecation/Removal:

- The ``func`` argument of ``fields.Function`` has been renamed to ``serialize``.
- The ``method_name`` argument of ``fields.Method`` has been renamed to ``serialize``.

``func`` and ``method_name`` are still present for backwards-compatibility, but they will both be removed in marshmallow 3.0.

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Bug fixes:

- Skip field validators for fields that aren't included in ``only`` (:issue:`320`). Thanks :user:`carlos-alberto` for reporting and :user:`eprikazc` for the PR.

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Features:

- Add support for partial deserialization with the ``partial`` argument to ``Schema`` and ``Schema.load`` (:issue:`290`). Thanks :user:`taion`.

Deprecation/Removals:

- ``Query`` and ``QuerySelect`` fields are removed.
- Passing of strings to ``required`` and ``allow_none`` is removed. Pass the ``error_messages`` argument instead.

Support:

- Add example of Schema inheritance in docs (:issue:`225`). Thanks :user:`martinstein` for the suggestion and :user:`juanrossi` for the PR.
- Add "Customizing Error Messages" section to custom fields docs.

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Bug fixes:

- Fix serialization of collections for which ``iter`` will modify position, e.g. Pymongo cursors (:issue:`303`). Thanks :user:`Mise` for the catch and patch.

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Bug fixes:

- Fix passing data to schema validator when using ``validates_schema(many=True)`` (:issue:`297`). Thanks :user:`d-sutherland` for reporting.
- Fix usage of ``validates`` with a nested field when ``many=True`` (:issue:`298`). Thanks :user:`nelfin` for the catch and patch.