code: public function delete() : bool
      {
          $status = false;
          if ($this->new === false) {
              $deleteQuery = new Delete($this->getDatabaseName());
              $deleteQuery->from($this->getTableName());
              $where = array();
              foreach ($this->getPrimary() as $primary) {
                  $field = $this->{'field' . ucfirst($primary)};
                  $realName = constant(get_called_class() . '::FIELD_' . strtoupper(Helper::codifyName($primary)));
                  $where[$realName] = ':primary' . ucfirst($primary);
                  $deleteQuery->bind('primary' . ucfirst($primary), $field['value']);
              }
              $deleteQuery->where($where);
  
              $status = $deleteQuery->execute();
          }
  
          return $status;
      }
docs: If not new, delete the model.
  
  @return bool true if successfully deleted