Mojo:PG migration - I'm having some trouble and it's because I don't quite understand what it's doing.

DBAdmin.pm

package MyApp::Model::DBAdmin;
use Mojo::Base -base;

has 'database';

sub new { bless {}, shift }

sub create_table {
  my ($self, $tablename) = @_;
  $tablename = "test";
  $self->database->migrations->name($tablename)->from_string(
  "-- 1 up
  create table if not exists $tablename (id serial primary key, name text);
  -- 1 down
  drop table if exists $tablename;"
  )->migrate;
}

1;