/**
  * Gets the public url for the file
  * @param ModelCore The subject model
  * @param string $column The column name
  * @return string
  */
 public function getPublicUrl(ModelCore $model = NULL, $column = '')
 {
     $url = '';
     $filename = '';
     if ($model) {
         $filename = $model->getAttributes()[$column];
         $this->column = $column;
     } elseif ($this->subjectModel) {
         $filename = $this->subjectModel->{$this->column};
     }
     if (!$filename) {
         return $url;
     }
     $configPath = $this->getConfigPath($model);
     $url = request()->root() . '/images/' . $configPath . '/' . $filename;
     return $url;
 }