Chained validators not working as documented

[benbeanfield]

From the docs:

chained_validators will also allow for multiple validators to fail and report to the error_dict

Running the following snippet should result in two errors, but only one is produced:

>>> from formencode import Invalid, Schema
>>> from formencode.validators import RequireIfMissing
>>> 
>>> class A(Schema):
...     chained_validators = [
...         RequireIfMissing('foo', missing='far'), 
...         RequireIfMissing('moo', missing='mar')]
... 
>>> 
>>> try:
...     A.to_python({})
... except Invalid as e:
...     print e.error_dict
... 
{'foo': Invalid(u'Please enter a value', None, None, None, None)}```

[Cito]

This works only for validators that define a validate_partial() method and have validate_partial_form=True, which is the case only for FieldsMatch and the CreditCardValidators; so it does not work with RequireIfMissing and RequireIfMatching.

This should in fact be mentioned in the docs, but maybe we should also add partial_validate() methods to some more validators?

[benbeanfield]

Thanks for the explanation, Cito.

Yep, I'd think that any validator that could conceivably implement partial_validate() would do so.