package DBIx::Class::Helper::ResultSet::Shortcut::ResultsExist;
$DBIx::Class::Helper::ResultSet::Shortcut::ResultsExist::VERSION = '2.035000';
use strict;
use warnings;

use parent 'DBIx::Class::ResultSet';

sub results_exist_as_query {
   my $self = shift;


   my $reified = $self->search_rs( {}, {
      columns => { _results_existence_check => \ '42' }
   } )->as_query;


   $$reified->[0] = "( SELECT EXISTS $$reified->[0] )";


   $reified;
}


sub results_exist {
   my $self = shift;

   my $query = $self->results_exist_as_query;
   $$query->[0] .= ' AS _existence_subq';

   my( undef, $sth ) = $self->result_source
                             ->schema
                              ->storage
                               ->_select(
                                 $query,
                                  \'*',
                                  {},
                                  {},
                               );

   $sth->fetchall_arrayref->[0][0] ? 1 : 0;
}

1;

__END__

=pod

=head1 NAME

DBIx::Class::Helper::ResultSet::Shortcut::ResultsExist

=head1 AUTHOR

Arthur Axel "fREW" Schmidt <frioux+cpan@gmail.com>

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2020 by Arthur Axel "fREW" Schmidt.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut