plone.directives.form @form.validator error messages

Hi,

I ran into an issue with Dexterity 2.0 where I'm not sure if this a documentation, migration from 1.x to 2.x
dexterity or zope.formlib/z3c.form issue. The default example on the plone.directives.form 2.0 for adding
validators to forms is:

@form.validator(field=IMySchema['title'])
def validateTitle(value):
    if value == value.upper():
        raise schema.ValidationError(u"Please don't shout")

This will however never show "Please don't shout", but a constant error message, which has been
reported in a bug report at https://dev.plone.org/ticket/13380 in 2012. 

A solution is to use Invalid from zope.interface:  raise Invalid(u"Please don't shout")

Is this a documentation error or a bug in plone.directives.form 2.0 that can be fixed?

zope.schema.ValidationError:
	* https://pypi.python.org/pypi/plone.directives.form/2.0 
        * http://docs.plone.org/external/plone.app.dexterity/docs/reference/value-and-validator-adaptors.html

zope.interface.Invalid:
	* http://docs.plone.org/external/plone.app.dexterity/docs/advanced/validators.html
	* http://docs.plone.org/develop/addons/schema-driven-forms/customising-form-behaviour/validation.html

With kind regards,

Fred van Dijk
--
Zest - www.zestsoftware.nl
Vasteland 78
3011 BN Rotterdam
Tel: +31 (0)10 2959251


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