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my $ret = $src_drinks->match( { sugar => "no",
                                color => "black" } );

SELELCT * FROM drinks WHERE sugar LIKE "no" AND color LIKE "black";

# sub match
# return all objects that match the requested options
...
  $self->{ _matched }->{ $keys[0]."@".$hashref->{ $keys[0] } } = \@ret
+ if ( @keys == 1 );
  return \@ret;
}