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my $obj = 'Parent'->new;
$obj->populate(@data);
...
    }
}
# Don't forget to handle the case that $obj hasn't changed.

sub new_from_parent { die "Should be overriden.\n" }

...
    my @possible_child_classes = @_;
    for my $child_class (@possible_child_classes) {
        # etc. using $self instead of $obj.

my $obj = 'Parent'->new;
$obj->populate(@data);
$obj->rebless(@possible_child_classes);