Regression: Allow unknown causes dictionary validation to fail with a ``KeyError``

[daviskirk]

Used Cerberus version / latest commit: 1.1

• I consulted these documentations:

  • http://docs.python-cerberus.org/en/stable/
  • http://docs.python-cerberus.org/en/latest/

• I consulted these sections of the docs (add more lines as necessary):

  • http://docs.python-cerberus.org/en/latest/changelog.html?highlight=changelog

• I found nothing relevant to my problem in the docs.

• I found the documentation not helpful to my problem.

• I have the capacity to improve the docs when my problem is solved.

• I have the capacity to submit a patch when a bug is identified.

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Use-case abstract

Validating a dictionary with allow_unknown set to True

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Support request / Bug report

This might be a regression, since testing this on 1.0.1 works fine:

v = cerberus.Validator({'a': {'type': 'dict', 'allow_unknown': True}})
v.validate({'a': {}})

Errors out with the exception:

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "./lib/python3.5/site-packages/cerberus/validator.py", line 795, in validate
    self.__normalize_mapping(self.document, self.schema)
  File "./lib/python3.5/site-packages/cerberus/validator.py", line 549, in __normalize_mapping
    self.__normalize_containers(mapping, schema)
  File "./lib/python3.5/site-packages/cerberus/validator.py", line 607, in __normalize_containers
    field, mapping, schema)
  File "./lib/python3.5/site-packages/cerberus/validator.py", line 653, in __normalize_mapping_per_schema
    schema=schema[field]['schema'],
KeyError: 'schema'

The example without the 'allow_unknown' key or with an invalid type work without error:

v = cerberus.Validator({'a': {'type': 'dict'}})
v.validate({'a': {}}) # True
v = cerberus.Validator({'a': {'type': 'dict', 'allow_unknown': True}})
v.validate({})  # True
v.validate({'a': 4})  # False

[nicolaiarocci]

Thanks. Should be fixed now.