push @columns, 'statement';
push @columns, 'solution' unless $running;
my $pb = $self->problems->find($id, {columns => \@columns, prefetch => 'owner'});
push @columns, 'statement';
push @columns, 'solution' unless $running;
my $pb = $self->problems->find($id, {columns => \@columns, prefetch => 'owner'});