code: protected function getDefaultAttributes(Model $model)
      {
          $defaults = [];
  
          if ($this->hasCreatedAtAttribute($model)) {
              $createdAt = $model->getCreatedAtColumn();
              $field = $this->fieldForAttribute($createdAt);
              $defaults[$field] = $this->extractAttribute($model, $createdAt, $field);
          }
  
          if ($this->hasUpdatedAtAttribute($model)) {
              $updatedAt = $model->getUpdatedAtColumn();
              $field = $this->fieldForAttribute($updatedAt);
              $defaults[$field] = $this->extractAttribute($model, $updatedAt, $field);
          }
  
          if ($this->hasDeletedAtAttribute($model)) {
              $deletedAt = $model->getDeletedAtColumn();
              $field = $this->fieldForAttribute($deletedAt);
              $defaults[$field] = $this->extractAttribute($model, $deletedAt, $field);
          }
  
          return $defaults;
      }
docs: Get attributes that are included for every model class.
  
  @param Model $model
  @return array