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Custom error handling
=====================
By default, `Schema.load <marshmallow.Schema.load>` will raise a :exc:`ValidationError <marshmallow.exceptions.ValidationError>` if passed invalid data.
You can specify a custom error-handling function for a :class:`Schema` by overriding the `handle_error <marshmallow.Schema.handle_error>` method. The method receives the :exc:`ValidationError <marshmallow.exceptions.ValidationError>` and the original input data to be deserialized.
.. code-block:: python
import logging
from marshmallow import Schema, fields
class AppError(Exception):
pass
class UserSchema(Schema):
email = fields.Email()
def handle_error(self, exc, data, **kwargs):
"""Log and raise our custom exception when (de)serialization fails."""
logging.error(exc.messages)
raise AppError("An error occurred with input: {0}".format(data))
schema = UserSchema()
schema.load({"email": "invalid-email"}) # raises AppError
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