[FE-discuss] Compound validators usage

Hi there,

i have a schema validator and want to use another compound validator
(SimpleFormValidator) from within the schema.

E.g. I do something along the lines:


def validate_text(value_dict, state, validator):

     # validation of text_field goes here. check value_dict for
bool_field's value to determine what to do next.


class ProductConfigurationSchema(Schema):
    filter_extra_fields = True
    allow_extra_fields = True

     bool_field = validators.Bool()
     text_field = SimpleFormValidator(validate_text)


This does not work as the schema does not expect that its fields are
compound validators. It doesn't pass the value_dict to the
SimpleFormValidator but rather a single value. This results in the
following errror in SimpleFormValidators to_python method:

    value_dict = value_dict.copy()
AttributeError: 'unicode' object has no attribute 'copy'


I followed that route because I want to achieve the following:

The visibility of the text_field depends on the bool_field. Therefore I'd
thought I write a custom method that checks the state of the bool when
validating the text_field. If it is set, I would perform the actual
validation. If the bool is not set, the text_field is irrelevant and
validating would essentially be a no-op.


Any tip how to tackle this?


Cheers, prinz.