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   1 # mixed pq\Gateway\Row::ofWhich(mixed $foreign[, string $ref = NULL])
   2
   3 Find the parent row by foreign key.
   4 See pq\Gateway\Table::by().
   5
   6 ## Params:
   7
   8 * mixed $foreign
   9   The foreign table (name).
  10 * Optional string $ref = NULL
  11   A specific relation name if there are more than one foreign keys to the same table.
  12
  13 ## Returns:
  14
  15 * a [deferred promise of React/Promise](https://github.com/reactphp/promise#deferred-1), when using pq\Query\AsyncExecutor, the asynchronous executor.
  16   Else:
  17 * pq\Result, if pq\Result::$status != pq\Result::TUPLES_OK.
  18 * pq\Result, if the rowset prototype pq\Gateway\Table::$rowset is empty.
  19 * pq\Gateway\Rowset, an instance of the rowset prototype.