in reply to How to do a DBIx subquery?

I think I need to do a prefetch as illustrated here

I tried: 

  my $results = $s->results->find($id, {
      prefetch => ['metas']
    } );
  my $post_id = $results->_menu_item_object_id;

[download]

I just got an error, though: Can't locate object method "_menu_item_object_id" via package "WordPress::DBIC::Schema::Result::WpPost"

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