code: protected function getMetaWhereConstraint($method, ArgumentBag $args)
      {
          $column = $args->get('column');
  
          $args->set('column', 'meta_value');
  
          if ($method === 'whereBetween') {
              return $this->getMetaBetweenConstraint($column, $args->get('values'));
          }
  
          return function ($query) use ($column, $method, $args) {
              $query->where('meta_key', $column);
  
              if ($args->get('value') || $args->get('values')) {
                  call_user_func_array([$query, $method], $args->all());
              }
          };
      }
docs: Get the relation constraint closure.
  
  @param  string $method
  @param  \Sofa\Hookable\Contracts\ArgumentBag $args
  @return \Closure