[Grok-dev] validators

[Thomas Bellembois]

Hello,

Where can we find a documentation about validators ? How can we create a
custom validator to overide the default validator ?
I have a container "Molecule" with 4 fields:

class Molecule(grok.Container):
    interface.implements(IMolecule)
    cas_number = u''
    ce_number = u''
    remark = u'--'

and I have added a drop down list in the default template file to add
another field (like a foreign key). I would like this drop down list to be a
required field.

Thanks for your help.

Thomas
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