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=head1 NAME

Lucy::Search::SortRule - Element of a SortSpec.

=head1 SYNOPSIS

    my $sort_spec = Lucy::Search::SortSpec->new(
        rules => [
            Lucy::Search::SortRule->new( field => 'date' ),
            Lucy::Search::SortRule->new( type  => 'doc_id' ),
        ],
    );



=head1 DESCRIPTION

SortRules are the building blocks used to assemble
L<SortSpecs|Lucy::Search::SortSpec>; each SortRule defines a single
level of sorting.  For example, sorting first by "category" then by score
requires a SortSpec with two SortRule elements.

=head1 CONSTRUCTORS

=head2 new( I<[labeled params]> )

    my $by_title   = Lucy::Search::SortRule->new( field => 'title' );
    my $by_score   = Lucy::Search::SortRule->new( type  => 'score' );
    my $by_doc_id  = Lucy::Search::SortRule->new( type  => 'doc_id' );
    my $reverse_date = Lucy::Search::SortRule->new(
        field   => 'date',
        reverse => 1,
    );

=over

=item *

B<type> - Indicate whether to sort by score, field, etc.  (The
default is to sort by a field.)

=item *

B<field> - The name of a C<< sortable >> field.

=item *

B<reverse> - If true, reverse the order of the sort for this rule.

=back



=head1 METHODS

=head2 get_field()

Accessor for "field" member.

=head2 get_reverse()

Accessor for "reverse" member.



=head1 INHERITANCE

Lucy::Search::SortRule isa Clownfish::Obj.


=cut

