original_string: public function relation($name, $label, $builder = null)
      {
          if (is_null($builder)) {
              $builder = $label;
              $label = '';
          }
  
          return $this->addRelation($name, $builder, $label);
      }
code: public function relation($name, $label, $builder = null)
      {
          if (is_null($builder)) {
              $builder = $label;
              $label = '';
          }
  
          return $this->addRelation($name, $builder, $label);
      }
code_tokens: public function relation ( $ name , $ label , $ builder = null ) { if ( is_null ( $ builder ) ) { $ builder = $ label ; $ label = '' ; } return $ this -> addRelation ( $ name , $ builder , $ label ) ; }
docstring: Add a relation to show.
  
  @param string          $name
  @param string|\Closure $label
  @param null|\Closure   $builder
  
  @return Relation
docstring_tokens: Add a relation to show .