Fran,
You are right, I had a look at my code, in a custom form I have:
form=form_factory(SQLField('plaats',requires=IS_NOT_EMPTY(),\
widget=lambda self, value:INPUT
(_type='text',_id='clubbyplace',_class='ac_input',_name='plaats',requires=self.requires)))
This prevents the field from being empty but it does not prevent the
user from adding a duplicate value.
Annet.
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