Catalyst trap: param and params

well, if we write code as follows:

sub test : Local {
   my ($self, $c) = @_;
     my $test = {
       a => $c->req->param('a'),
       b => $c->req->param('b'),
       c => $c->req->param('c'),
   };
   $c->res->body(Dumper(\$test));
} 

then try to visit test?b=1, guess what we get? that's not what we expected.

$VAR1 = \{
           '1' => 'c',
           'a' => 'b'
         }; 

a weird result!

please use follows, that's much better.

sub test : Local {
    my ($self, $c) = @_;

    my $test = {
        a => $c->req->params->{'a'},
        b => $c->req->params->{'b'},
        c => $c->req->params->{'c'},
    };
    $c->res->body(Dumper(\$test));
} 

and get what we want:

$VAR1 = \{
            'a' => undef,
            'b' => '1',
            'c' => undef
          };

so do remember that. and don't write dbix insert/update code like that.