Re: only validate some field if another is set to something

Elvelind Grandin wrote:
> Hi.
> 
> I want to only validate certain fields if another is a certain value.
> 
> http://paste.turbogears.org/paste/1178
> 
> I use this code and it works fine.
> 
> the problem is that the _to_python method for the NiceHTML validator
> is called, but the returned argument is ignored.

You aren't returning values that make sense. 
formencode.validators.RequireIfMissing is more the pattern of what you 
want.  Or FieldsMatch, or one of those.

You could probably generalize what you are thinking about like:

class ValidateWhenTrue(Schema):
     # Set this to some function:
     condition = None

     def to_python(self, value_dict, state):
         if not self.condition(value_dict, state):
             # don't do anything
             return value_dict
         return Schema.to_python(self, value_dict, state)


class ValidateOptional(ValidateWhenTrue):
     def condition(self, value_dict, state):
         return not value_dict.get('some_field')
     some_other_field = SomeValidator()



-- 
Ian Bicking | [email protected] | http://blog.ianbicking.org
             | Write code, do good | http://topp.openplans.org/careers

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