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package SL::DB::Unit;
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use strict;
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use SL::DB::MetaSetup::Unit;
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use SL::DB::Manager::Unit;
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use SL::DB::Helper::ActsAsList;
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__PACKAGE__->meta->add_relationships(
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base => {
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type => 'many to one',
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class => 'SL::DB::Unit',
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column_map => { base_unit => 'name' },
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},
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);
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__PACKAGE__->meta->initialize;
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#methods
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sub unit_class {
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my $self = shift;
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return $self if !$self->base_unit || $self->name eq $self->base_unit;
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return $self->base->unit_class;
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}
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sub convertible_units {
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my $self = shift;
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return [
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sort { $a->sortkey <=> $b->sortkey }
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grep { $_->unit_class->name eq $self->unit_class->name }
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@{ SL::DB::Manager::Unit->get_all }
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];
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}
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sub base_factor {
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my ($self) = @_;
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if (!defined $self->{__base_factor}) {
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$self->{__base_factor} = !$self->base_unit || !$self->factor || ($self->name eq $self->base_unit) ? 1 : $self->factor * $self->base->base_factor;
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}
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return $self->{__base_factor};
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}
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sub convert_to {
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my ($self, $qty, $other_unit) = @_;
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my $my_base_factor = $self->base_factor || 1;
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my $other_base_factor = $other_unit->base_factor || 1;
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return $qty * $my_base_factor / $other_base_factor;
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}
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1;
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