handle error by flashing error msg in admin during data entry
You will need to implement that yourself by overriding `ModelAdmin.save_model`.

```
class Organization(db.Model):
    name = TextField(default="", unique=True)

    def save(self, *args, **kwargs):
        if not self.get_id():  # this is the first time saving
            self.create_folder()
        return super(Organization, self).save(*args, **kwargs)

    def __unicode__(self):
        return self.name

    def create_folder(self):
        if not os.path.exists(get_project_path(), 'forms', self.name):
            os.mkdir(os.path.join(get_project_path(), 'forms', self.name))
```

After solving issue #234, I am into another problem. If the user enters same name, can a message be flashed, stating that the name already exists in flask-peewee admin ?
