validation - python-eve Cerberus keeps throwing "uknown rule" error for embedded dictionary? - Stack Overflow

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A production server is down due to some outdated drivers so I've been upgrading packages to get it working again. I think I'm quite close but eve is giving me some trouble. I have the following schema to validate. Removed some fields for clarity;

survey.py

from . import question
from . import building_data
from . import address

schema = {
    'buildingAddress': {
        'type': 'dict',
        'schema': address.schema,
    },

    'surveyType': {
        'type': 'string',
        'allowed': [
            "local",
            "global",
        ],
    },

    'questions': {
        'type': 'list',
        'schema': {
            'type': 'dict',
            'schema': question.embedded_schema,
        }
    },
}

questions.py

import copy

schema = {

    'name': {
        'type': 'string',
        'required': True
    },

    'type': {
        'type': 'string',
        'allowed': [
            'boolean',
            'shortText',
        ],
        'required': True,
    },

    'group': {
        'type': 'string'
    },
    'title': {
        'type': 'string',
        'required': True
    },

    'oldCode': {
        'type': 'string'
    },

    'questionSets': {
        'type': 'list',
        'schema': {
            'type': 'string'
        },
    },

    'min': {
        'type': 'number',
        'nullable': True,
    },
    'max': {
        'type': 'number',
        'nullable': True,
    },

    'range': {
        'type': 'number',
        'nullable': True,
        'min': 1,
    },
    'minValue': {
        'type': 'string',
    },
    'maxValue': {
        'type': 'string',
    },

    # single / multiple choice
    'choices': {
        'type': 'dict',
        'propertyschema': {
            'type': 'string',
            'regex': '\d+'
        }
    },

}

embedded_schema = copy.deepcopy(schema)

embedded_schema.update(
    {
        '_id': {
            'type': 'objectid',
            'data_relation': {
                'resource': 'questions',
                'field': '_id',
                'embeddable': False
            }
        },
    }
)

For whatever reason, a SchemaError(self.schema_validator.errors) exception is raised when making a post call. The error is seemingly from the "questions" field, as the rest of the exception i as follows. Clipped the rest for readability.

{'questions': [{'schema': ['no definitions validate', {'anyof definition 0': [{'schema': [{'_id': ['unknown rule'], '_version': ['unknown rule'], 'choices': ['unknown rule'], 'group': ['unknown rule'], 'maxValue': ['unknown rule'], 'minValue': ['unknown rule'], 'name': ['unknown rule'], 'oldCode': ['unknown rule'], 'questionSets': ['unknown rule'], 'range': ['unknown rule'], 'title': ['unknown rule'], 'type': ["must be of ['string', 'list'] type"]}], 'type': ['null value not allowed']}], 'anyof definition 1': [{'schema': ['no definitions validate', {'anyof definition 0': [{'choices': [{'propertyschema': ['unknown rule']}]}] ...

I've tried several different combinations of eve and cerberus to no luck. I've looked through the repository and Cerberus is not being imported anywhere in the code, so it has to be the eve version of cerberus being used.

I'm currently on eve 1.1.5 and cerberus 1.3.6. Upgraded fron eve 0.7.10 and Cerberus 0.9.2

I would appreciate any help/suggestions.

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