def validate_unique(self, value):
     if next(duplicated(value), None):
         raise ValidationError('Values must be unique.')
def _validate_field_labels_unique(fields):
    "Field labels must be unique"
    if next(duplicated(f.label for f in fields), None):
        raise ValidationError("Labels must be unique")
def _validate_field_names_unique(fields):
    "Field names must be unique"
    if next(duplicated(f.name for f in fields), None):
        raise ValidationError("Names must be unique")
 def validate_unique(self, value):
     if next(duplicated(value), None):
         raise ValidationError('Values must be unique.')
def _validate_field_labels_unique(fields):
    "Field labels must be unique"
    if next(duplicated(f.label for f in fields), None):
        raise ValidationError("Labels must be unique")
def _validate_field_names_unique(fields):
    "Field names must be unique"
    if next(duplicated(f.name for f in fields), None):
        raise ValidationError("Names must be unique")