E.g.
http://hydra.nixos.org/view/nixpkgs/unstable/latest/eval
Thus this is the channel representing the latest Nixpkgs for which the elements of the view "unstable" succeeded:
http://hydra.nixos.org/view/nixpkgs/unstable/latest/eval/channel
KU33KNG3I2NHT6HFDAXQAHJHOSC6VGJ2C3K6ADTIREKZQEOVVORQC
elsif (scalar @args >= 1 && $args[0] eq "eval") {
my $eval = $c->stash->{result}->{eval};
notFound($c, "This view result has no evaluation.") unless defined $eval;
my $uri = $c->uri_for($c->controller('JobsetEval')->action_for("view"), [$eval->id]);
$uri .= "/" . join("/", @args[1..$#args]) if scalar @args > 1;
$c->res->redirect($uri);
}