EncryptedCharField doesn't validate length

[dustinlacewell]

Instead of raising a validationerror at the appropriate time, a ValueError is raised at save time:

Traceback:
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django/core/handlers/base.py" in get_response
  92.                 response = callback(request, *callback_args, **callback_kwargs)
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django/contrib/admin/options.py" in wrapper
  226.                 return self.admin_site.admin_view(view)(*args, **kwargs)
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
  44.         response = view_func(request, *args, **kwargs)
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django/contrib/admin/sites.py" in inner
  186.             return view(request, *args, **kwargs)
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django/db/transaction.py" in _commit_on_success
  240.                 res = func(*args, **kw)
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django/contrib/admin/options.py" in change_view
  833.                     self.save_formset(request, form, formset, change=True)
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django/contrib/admin/options.py" in save_formset
  563.         formset.save()
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django/forms/models.py" in save
  522.         return self.save_existing_objects(commit) + self.save_new_objects(commit)
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django/forms/models.py" in save_existing_objects
  640.                 saved_instances.append(self.save_existing(form, obj, commit=commit))
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django/forms/models.py" in save_existing
  510.         return form.save(commit=commit)
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django/forms/models.py" in save
  407.                              fail_message, commit, exclude=self._meta.exclude)
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django/forms/models.py" in save_instance
  78.         instance.save()
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django/db/models/base.py" in save
  410.         self.save_base(force_insert=force_insert, force_update=force_update)
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django/db/models/base.py" in save_base
  474.                         rows = manager.filter(pk=pk_val)._update(values)
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django/db/models/query.py" in _update
  442.         query.add_update_fields(values)
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django/db/models/sql/subqueries.py" in add_update_fields
  245.                 val = field.get_db_prep_save(val)
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django/db/models/fields/__init__.py" in get_db_prep_save
  192.         return self.get_db_prep_value(value)
File "/iscape/sites/ahcdeploy/lib/python2.5/site-packages/django_fields/fields.py" in get_db_prep_value
  106.                     str(len(value)) + " > " + str(self.unencrypted_length))

Exception Type: ValueError at /admin/cne/registration/1/
Exception Value: Field value longer than max allowed: 89 > 64

class EncryptedCharField(BaseEncryptedField):
    __metaclass__ = models.SubfieldBase

    def get_internal_type(self):
        return "CharField"

    def formfield(self, **kwargs):
        defaults = {'max_length': self.max_length}
        defaults.update(kwargs)
        return super(EncryptedCharField, self).formfield(**defaults)

    def get_db_prep_value(self, value, connection=None, prepared=False):
        if value is not None and not self._is_encrypted(value):
            if len(value) > self.unencrypted_length:
                raise ValueError("Field value longer than max allowed: " +
                    str(len(value)) + " > " + str(self.unencrypted_length))
        return super(EncryptedCharField, self).get_db_prep_value(
            value,
            connection=connection,
            prepared=prepared,
        )

https://github.com/svetlyak40wt/django-fields/blob/master/src/django_fields/fields.py#L106

[svetlyak40wt]

Feel free to provide a patch. But don't forget to add a unittest as well.