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package SL::DB::Unit;

use strict;

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(
base => {
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type => 'many to one',
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class => 'SL::DB::Unit',
column_map => { base_unit => 'name' },
},
);

__PACKAGE__->meta->initialize;

#methods

sub unit_class {
my $self = shift;

return $self if !$self->base_unit || $self->name eq $self->base_unit;
return $self->base->unit_class;
}

sub convertible_units {
my $self = shift;
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my $all_units = scalar(@_) && (ref($_[0]) eq 'ARRAY') ? $_[0] : \@_;
$all_units = SL::DB::Manager::Unit->get_all if !@{ $all_units };
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return [
sort { $a->sortkey <=> $b->sortkey }
grep { $_->unit_class->name eq $self->unit_class->name }
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@{ $all_units }
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];
}

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sub base_factor {
my ($self) = @_;

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my $cache = $::request->cache('base_factor');

if (!defined $cache->{$self->id}) {
$cache->{$self->id} = !$self->base_unit || !$self->factor || ($self->name eq $self->base_unit) ? 1 : $self->factor * $self->base->base_factor;
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}

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return $cache->{$self->id};
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}

sub convert_to {
my ($self, $qty, $other_unit) = @_;

my $my_base_factor = $self->base_factor || 1;
my $other_base_factor = $other_unit->base_factor || 1;

return $qty * $my_base_factor / $other_base_factor;
}

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1;