system/classes/Model.php
public function isPlaceholder($attributeName)
    {
      // Ref this model's attributes in a shorter variable.
      $def = $this->model_attributes[$attributeName];

      if (isset($def['models']) || (isset($def['model']) && isset($def['usesRefTable']))) {
        return true;
      }
      return false;
    }
public function isPlaceholder($attributeName)
    {
      // Ref this model's attributes in a shorter variable.
      $def = $this->model_attributes[$attributeName];

      if (isset($def['models']) || (isset($def['model']) && isset($def['usesRefTable']))) {
        return true;
      }
      return false;
    }
public function isPlaceholder ( $ attributeName ) { // Ref this model's attributes in a shorter variable. $ def = $ this -> model_attributes [ $ attributeName ] ; if ( isset ( $ def [ 'models' ] ) || ( isset ( $ def [ 'model' ] ) && isset ( $ def [ 'usesRefTable' ] ) ) ) { return true ; } return false ; }
Sometimes a placeholder value of "1" will be loaded into models which indicate the data is available,
but must be fetched if needed. This method indicates whether or not a value of 1 means it's a placeholder.

@param $attributeName string An attribute name who's value in model_data is "1"
@return bool
Sometimes a placeholder value of 1 will be loaded into models which indicate the data is available but must be fetched if needed . This method indicates whether or not a value of 1 means it s a placeholder .