sub filter_by_for_hold {
my ($self) = @_;
return $self->search( { notforloan => { '<' => 1 } } ); # items with negative or zero notforloan value are holdable
return $self->search( { notforloan => { '<=' => 0 } } ); # items with negative or zero notforloan value are holdable
}
=head3 filter_by_visible_in_opac
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