gareth.doutch schrieb:
> Hi,
>
> How do I create a validator that can check an input value against
> currently stored values to ensure that duplicate entries do not occur?
> I saw a discussion on this previously, but it went off the list.
Use the Schema chained_validators to add a custom FormValidator that
does the trick.
Something along these lines:
class MyValidator(FormValidator):
messages = {
'invalid': _("Invalid handle (handle is already used)"),
}
messages = {
'user_name': _("Invalid user_name (user_name is already used)"),
'email': _("Invalid emal (email is already used)"),
'password': _("You need to give a password"),
}
def validate_python(self, form_value, state):
import varms.model as m
user_name = form_value['user_name'].strip()
email = form_value['email_address'].strip()
own_id = form_value['id']
error_dict = {}
try:
b = m.User.by_user_name(user_name)
if b.id != own_id:
error_dict.update({'user_name' :
self.message('user_name', state)})
except m.SQLObjectNotFound:
pass
try:
b = m.User.by_email_address(email)
if b.id != own_id:
error_dict.update({'email_address' :
self.message('email', state)})
except m.SQLObjectNotFound:
pass
if form_value.get('set_password', False) or own_id == -1:
password = form_value['password']
if password is None or not password.strip():
error_dict.update({'password' :
self.message('password', state)})
raise Invalid(None, None, state, error_dict = error_dict)
# for whatever reason, we _need_ the above method
# as well as this one.
def validate_partial(self, form_value, state):
self.validate_python(form_value, state)
validate_partial_form = True
class MySchema(validators.Schema):
chained_validators = [MyValidator()]
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