My small Mojolicious app has the following structure:

+lib
   MyLib.pm
   +MyLib
        +Controller
             Invtot.pm
+public
    js files...
+script
     my_lib.pl
+t
    basic.t
+templates
       ....
      +layouts
       ....
[download]

It's composed of two pages, one with a form that need to connect to a database. I will a add an other form in a third page, that will connect to a second database. I came with the following (that works) to connect to my first db :

• use a callback to the get route of the form to connect
• rember the connection in hash $connections{my_db}=1;, so that the next time the page is displayed the connection is not made again if already done.

That way I could connect to different db without having all the connection done in the startup

The main module MyLib.pm is

package MyLib;
use Mojo::Base 'Mojolicious';

my %connections;

# This method will run once at server start
sub startup {
    my $self = shift;

    # Router
    my $r = $self->routes;

    # Normal route to controller
    $r->get('/')->to( template => 'index' );
    $r->get('/libmap');    #->to(controller => 'libmap');
    $r->get('/invtot')->to(
        controller => 'invtot',
        title      => 'Paper journals from the library',
        cb         => sub { $self->connect_invtot() }
    );

    if ( exists $ENV{PAR_TEMP} && $^O eq "MSWin32" ) {
        system qw(start http://localhost:3000/invtot);
    }

    $r->post('/invtot')->to( controller => 'Invtot', action => 'post' 
+);

}

sub connect_invtot {

    my $self = shift;
    return if $connections{db1};

    # Load configuration from hash returned by config file
    my $file;
    if ( $ENV{PAR_TEMP} ) {
        print $ENV{PAR_TEMP}, "\n";
        $file = $ENV{PAR_TEMP} . "/inc/script/my_lib.conf";
    }
    else {
        $file = 'my_lib.conf';
    }
    my $config = $self->plugin( 'Config', { file => $file } );

    # Configure the application
    $self->secrets( $config->{secrets} );

    $self->log->debug("connecting...");
    $self->plugin(
        'Database',
        {   dsn      => 'dbi:mysql:host=mysql....:dbname=d....',
            username => $config->{username},
            password => $config->{password},
            options  => {
                'pg_enable_utf8' => 1,
                AutoCommit       => 1,
                PrintError       => 0,
                RaiseError       => 1
            },
            helper => 'db1',
        }
    );
    $connections{db1} = 1;
}

1;
[download]

My question: even if that works, is there something that could break in the long term, something I forgot here?

Thanks

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