I want to create a paged content and i'm using DBIx for it. When I write a query without paging - it works fine. SQL without paging:

$c->stash->{routes} = [$c->model('QDB::Route')->search(
    {
            'n_1.net_id'     => $c->stash->{net_id},
    },
    {
        alias => 'rt', # alias columns in accordance with "from"
        from => [
            { rt => 'vi_route' },
            [
                { n_1 => 'vi_nodes', -join_type => 'inner'  },
                {
                    'rt.route_beg' => 'n_1.node_id',
                    'rt.net_id' => 'n_1.net_id'
                }
            ],
            [
                { n_2 => 'vi_nodes', -join_type => 'inner'  },
                {
                    'rt.route_end' => 'n_2.node_id',
                    'rt.net_id' => 'n_2.net_id'
                }
            ],
        ],
        'select' => [
            'rt.route_beg',
            'rt.route_end',
            \'n_1.node_name AS node_name_beg',
            \'n_2.node_name AS node_name_end',
            \'COUNT(rt.route_beg) as grp_count',
        ],
          'as'     => [ qw/ route_beg route_end node_name_beg node_nam
+e_end route_grp_count / ],
        'group_by' => [qw/ rt.route_beg rt.route_end node_name_beg nod
+e_name_end /],
    },
      )];
[download]

Equivalent SQL is normal:

SELECT rt.route_beg, 
rt.route_end, 
n_1.node_name AS node_name_beg, 
n_2.node_name AS node_name_end, 
COUNT(rt.route_beg) as grp_count 
FROM vi_route rt 
INNER JOIN vi_nodes n_1 
ON ( rt.net_id = n_1.net_id AND rt.route_beg = n_1.node_id ) 
INNER JOIN vi_nodes n_2 
ON ( rt.net_id = n_2.net_id AND rt.route_end = n_2.node_id )
WHERE ( n_1.net_id = ? ) 
GROUP BY rt.route_beg, rt.route_end, n_1.node_name, n_2.node_name 
ORDER BY node_name_beg: 'param_value'
[download]

But if I add few lines:

page => 1,  # page to return (defaults to 1)
rows => 10, # number of results per page
[download]

It becomes wrong and throw exception( Because sql query becomes bad. Equivalent SQL becomes bad:

SELECT * FROM
(
    SELECT TOP 10 * FROM
    (
        SELECT TOP 10  rt.route_beg, rt.route_end, n_1.node_name AS no
+de_name_beg, n_2.node_name AS node_name_end, COUNT(rt.route_beg) as g
+rp_count 
FROM vi_route rt 
INNER JOIN vi_nodes n_1 
ON ( rt.net_id = n_1.net_id AND rt.route_beg = n_1.node_id ) INNER JOI
+N vi_nodes n_2 
ON ( rt.net_id = n_2.net_id AND rt.route_end = n_2.node_id )
WHERE ( n_1.net_id = ? ) ORDER BY node_name_beg ASC
    ) AS foo
    #--  There must be GROUP BY CLAUSE but it's missed! --#
    ORDER BY node_name_beg DESC
) AS bar
ORDER BY node_name_beg ASC
: 'param_value'
[download]

DBIC missing group_by clause when generates sql for paged result. And sql server return error because aggregate function COUNT(rt.route_beg) not included in ORDER BY or GROUP BY clause. ======= If you think it was discussed in mail-lists - it's wrong! Or may be google search is broken?