Re: formEncode - complicate validate form

Ian Bicking wrote:
"
You want a FormValidator, because you are validating pieces 
together. 
An example of this is 
formencode.validators.RequireIfMissing/RequireIfPresent. You 
might want 
to look at the implementation; how you use that field is:

class MySchema(Schema):
     other fields...
     chained_validators = [RequireIfPresent(required='birthday', 
present='i_am_over_18')]

Form validators validate the entire dictionary that is submitted.
"

As I understand in this example both birthday and i_am_over_18 
are form field. But what if I want to do validate some field of 
form ONLY if other field has a specific value?
i saw source of formencode.validators.RequireIfMissing/
RequireIfPresent and value of field can be achieved by e.g. value
_dict.get(self.missing) but how called such this validator. 
This part i don't understand. And is it possible?
Grzegorz Ślusarek


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