Anthony Gladdish wrote:
> Hi,
>
> Using:
> Perl 5.10.
> DBIC 0.08108.
>
> 1. My result source tables with relationships are:
>
> Event.pm:
> __PACKAGE__->set_primary_key('id');
> __PACKAGE__->belongs_to( 'leader' => 'Trainer' ) ;
> __PACKAGE__->has_many( 'assistingtrainers' => 'AssistingTrainer', 'event' );
> __PACKAGE__->many_to_many('assistants' => 'assistingtrainers', 'trainers' );
>
> AssistingTrainer.pm:
> __PACKAGE__->set_primary_key('event','trainer');
> __PACKAGE__->belongs_to( 'events' => 'Event', 'event' );
> __PACKAGE__->belongs_to( 'trainers' => 'Trainer', 'trainer' );
>
> Trainer.pm:
> __PACKAGE__->set_primary_key('id');
>
> 2. My ResultSet::Event.pm methods:
>
> sub goEvents {
> my $self = shift;
> my $where = {};
> $where->{status} = { '&' => 2 };
> return $self->search($where);
> }
>
> sub events_during_lookback_period {
> my $self = shift;
> my $default_lookback_period = DateTime::Duration->new( years => 3 );
> my $lookback_period = shift || $default_lookback_period;
> my $earliest_date = DateTime->now() - $lookback_period;
> return $self->goEvents()->search_rs(
> {
> -and => [
> start => { '<', DateTime->now() },
> start => { '>', $earliest_date },
> ],
> }
> );
> }
>
> sub distinct_assistants {
> my $self = shift;
> my $assistants = [];
> my $rs = $self->search_rs(
> undef,
> {
> columns => [ qw/me.id/ ],
> distinct => 1,
> prefetch => [ { 'assistingtrainers' => 'trainers' } ],
> join => [ { 'assistingtrainers' => 'trainers' } ],
> },
> );
> while ( my $e = $rs->next() ) {
> foreach my $at ( $e->assistingtrainers() ) {
> push( @$assistants, $at->trainers );
> }
> }
> return $assistants;
> }
>
> 3. Test case producing error:
>
> $trainers =
> $schema->resultset('Event')->events_during_lookback_period($lookback_period)->distinct_assistants();
>
> The "distinct_assistants()" chained method is producing error:
>
> DBIx::Class::ResultSet::next(): DBI Exception: DBD::mysql::st execute failed:
> Unknown column 'assistingtrainers.event' in 'group statement' [for Statement
> "SELECT me.id, assistingtrainers.event, assistingtrainers.trainer,
> trainers.id, trainers.name, trainers.email, trainers.phone,
> trainers.initials, trainers.loginId, trainers.password FROM (SELECT me.id
> FROM event me WHERE ( ( ( start < ? AND start > ? ) AND status & ? ) ) GROUP
> BY me.id, assistingtrainers.event, assistingtrainers.trainer, trainers.id,
> trainers.name, trainers.email, trainers.phone, trainers.initials,
> trainers.loginId, trainers.password) me LEFT JOIN trainer_assist
> assistingtrainers ON assistingtrainers.event = me.id LEFT JOIN trainer
> trainers ON trainers.id = assistingtrainers.trainer WHERE ( ( ( start < ? AND
> start > ? ) AND status & ? ) ) ORDER BY assistingtrainers.event" with
> ParamValues: 0='2009-07-23T15:10:02', 1='2006-07-23T15:10:02', 2=2,
> 3='2009-07-23T15:10:02', 4='2006-07-23T15:10:02', 5=2]
>
> Can anyone see if any schema updates/tweaks are required to make this work?
> Or, if I'm missing anything else or if I'm using incorrect syntax?
> Or confirm if this is a bug?
>
The above should now work _unmodified_ with the current trunk (i.e. using
distinct => 1). Please test and report your findings.
Cheers
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