[Zope3-Users] Formlib and invariants

[Florian Lindner]

Am Mittwoch, 19. Juli 2006 03:25 schrieb Darryl Cousins:
> Hi All,
>
> I've had a bit of a struggle getting formlib error views to play nicely
> with invariants. That is the problem I have found to trouble me is in
> the zope.formlib.form.FormBase method error_views.
>
> When I use the schema:
>
> class IMemberRegisterForm(IMemberData, IMemberDetails):
>     """Schema for a member register form."""
>
>     new_password = Password(
>         title=_("Choose a Password"),
>         required=True)
>
>     verify_password = Password(
>         title=_("Verify Password"),
>         required=True)
>
>     @invariant
>     def passwordsMatch(register):
>         if register.new_password != register.verify_password:
>             msg = _("Entered passwords do not match")
>             error = ('verify_password', _("Passwords"), msg)
>             raise Invalid(error)

[...]

I am not sure if I've understood you correctly, but I've solved the same 
problem (raise error if passwords are not equal) this way:


class PasswordsAreNotEqual(ValidationError):
    """The passwords are not equal."""
    interface.implements(IWidgetInputError)

class IRegistrationForm(interface.Interface):
    """For entering the data for registration."""

    password = Password(title=u"Password",
                    description=u"Your password.",
                    required=True)
     
    password2 = Password(title=u"Verify Password",
                    required=True)
                                        
    @interface.invariant
    def arePasswordsEqual(obj):
        if obj.password != obj.password2:
            raise PasswordsAreNotEqual


Hope this helps,

Florian