Apispec

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Features:

- ``apispec.ext.marshmallow.swagger.schema2jsonschema`` properly introspects ``Schema`` instances when ``many=True`` (:issue:`53`). Thanks :user:`frol` for the PR.

Bug fixes:

- Fix error reporting when an invalid object is passed to ``schema2jsonschema`` or ``schema2parameters`` (:issue:`52`). Thanks again :user:`frol`.

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Features:

- ``APISpec.add_path`` accepts ``Path`` objects (:issue:`49`). Thanks :user:`Trii` for the suggestion and the implementation.

Bug fixes:

- Use correct field name in "required" array when ``load_from`` and ``dump_to`` are used (:issue:`48`). Thanks :user:`benbeadle` for the catch and patch.

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Features:

- Add ``APISpecadd_parameter`` for adding common Swagger parameter objects. Thanks :user:`jta`.
- The field name in a spec will be adjusted if a ``Field's`` ``load_from`` and ``dump_to`` attributes are the same. :issue:`43`. Thanks again :user:`jta`.

Bug fixes:

- Fix bug that caused a stack overflow when adding nested Schemas to an ``APISpec`` (:issue:`31`, :issue:`41`). Thanks :user:`alapshin` and :user:`itajaja` for reporting. Thanks :user:`itajaja` for the patch.

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- ``schema2jsonschema`` and ``schema2parameters`` can introspect a marshmallow ``Schema`` instance as well as a ``Schema`` class (:issue:`37`). Thanks :user:`frol`.
- *Backwards-incompatible*: The first argument to ``schema2jsonschema`` and ``schema2parameters`` was changed from ``schema_cls`` to ``schema``.

Bug fixes:

- Handle conflicting signatures for plugin helpers. Thanks :user:`AndrewPashkin` for the catch and patch.

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- Skip dump-only fields when ``dump=False`` is passed to ``schema2parameters`` and ``fields2parameters``. Thanks :user:`frol`.

Bug fixes:

- Raise ``SwaggerError`` when ``validate_swagger`` fails. Thanks :user:`frol`.

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- Correctly pass ``dump`` parameter to ``field2parameters``.