Can't handle this yet

##</code><code>##

my $resource_rs = $nation_rs->trades->search_related('nation')->search_related('resources');

##</code><code>##

package Game::DB::Schema::Nation;

__PACKAGE__->has_many(
  trades => 'Game::DB::Schema::Trades', [
   'foreign.id1' => 'self.id',
   'foreign.id2' => 'self.id',
  ],
);

package Game::DB::Schema:Trades;

__PACKAGE__->belongs_to(
  nation => 'Game::DB::Schema::Nation', [
   'foreign.id' => 'self.id1',
   'foreign.id' => 'self.id2',
  ],
);