[Grok-dev] Form data validation

[Sebastian Ware]

When you have a constraint in an interface, you only get passed the value of that field, not the actual object. You could use an invariant which gets passed the actual object:

    @interface.invariant
    def passwordConfirm(user):
        if (user.password != user.password_confirmation):
            raise interface.Invalid(u'The password and confirmation do not match.')

then you can create a field index for "uid" and do a search in the index.

  http://grok.zope.org/documentation/how-to/implementing-search

Mvh Sebastian


8 mar 2011 kl. 16.37 skrev Lumir Jasiok:

> Hi,
> 
> I am trying to figure out how to validate form data against ZODB's data. 
> I have Employees model, data saved into the ZODB.
> Inside IEmployee interface is field uid. I need to be sure, that uid is 
> unique, so I add "constraint=unique_uid" parameter.
> 
> How can I from function unique_uid check if Employee's uid is unique or 
> not? Or there is another, better way to doit?
> 
> class IEmployee(interface.Interface):
>     first_name = schema.TextLine(title=u'First name', required=True)
>     last_name = schema.TextLine(title=u'Last name', required=True)
>     uid = schema.TextLine(title=u'Personal Number', required=True, 
> constraint=unique_uid)
> 
> def unique_uid(uid):
>     ...?
> 
> Thanks for help
> 
> Lumir
> 
> -- 
>  Lumír Jasiok
>  VSB-TU Ostrava - Computer centre
>  Tel: +420 59 732 3189
>  E-mail: lumir.jasiok at vsb.cz
>  http://www.vsb.cz
> 
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