public function children() {
    return $this->hasMany(get_class($this), $this->getParentColumnName())
                ->orderBy($this->getOrderColumnName());
  }
public function children() {
    return $this->hasMany(get_class($this), $this->getParentColumnName())
                ->orderBy($this->getOrderColumnName());
  }
public function children ( ) { return $ this -> hasMany ( get_class ( $ this ) , $ this -> getParentColumnName ( ) ) -> orderBy ( $ this -> getOrderColumnName ( ) ) ; }
Children relation (self-referential) 1-N.

@return \Illuminate\Database\Eloquent\Relations\HasMany
Children relation ( self - referential ) 1 - N .