[Dbix-class] A count() after a grouping select() produces a "Duplicate column" error

[Vladimir Melnik]

Thank you, Gerhard!

It was almost the first thing I tried, but it hadn't help. :-)

On Tue, Oct 10, 2017 at 04:26:21PM +0200, Gerhard Jungwirth wrote:
> just guessing, did you try
> 
> group_by => [ 'me.quantity' ]
> 
> 
> On 2017-10-10 13:20, Vladimir Melnik wrote:
> > Dear colleagues,
> >
> > Here's a little snippet of the code:
> > 	$resultset
> > 	    ->search(undef, { group_by => [ qw(quantity) ] })
> > 	    ->count;
> >
> > It produces the following exception:
> > DBI Exception: DBD::mysql::st execute failed: Duplicate column name 'quantity' [for Statement "SELECT COUNT( * ) FROM (SELECT me.id, me.valid_from, me.valid_till, me.removed, me.provisioning_agreement_id, me.resource_piece_id, me.service_type_id, me.service_level_id, me.quantity, me.quantity FROM provisioning_obligation me GROUP BY quantity) me"] at /home/mmkeeper/perl5/perlbrew/perls/perl-5.24.0/lib/site_perl/5.24.0/DBIx/Class/Schema.pm line 1118.
> >
> > What is the best way to avoid that?
> >
> > Thanks in advance!
> >
> 
> 
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-- 
V.Melnik