Cerberus META validation rule access

Question

Python cerberus has a validation rule called meta where I assign a dict to meta rule. How am i supposed to access it? I am writing a custom error_handler using this to customise the error messages.

My target is schema = {'a': {'type': 'integer', 'meta': {'label': 'Age'}}} and would like to use the label in my error message.

Any help would be appreciated.

Answer 1

Answering my own question.

I created a custom error_handler to prepend the label to my error messages.

from cerberus.errors import BasicErrorHandler

class CustomErrorHandler(BasicErrorHandler):
    def __init__(self, schema):
        self.custom_defined_schema = schema

    def _format_message(self, field, error):
        return self.custom_defined_schema[field].get('meta', {}).get('label', field) + ': ' + super(CustomErrorHandler, self)._format_message(field, error)

val = Validator(schema, error_handler=CustomErrorHandler(schema))

Hopefully it'll help the future users.