Your question is addressed exactly by Class::DBI. It is particularly good at translating database relationships into object methods, so your users and projects question all but disappears. Assuming you have a Class::DBI class for each of user and project, put this in the My::User class:
__PACKAGE__->hasa_list(
'My::Project',
['name_of_field_in_project_table'],
'projects',
);
And then to retrieve the projects all you have to say is:
my $user = My::User->retrieve($id);
my @projects = $user->projects();
I use it all the time and i can't recommend it highly enough.
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