$c->stash->{routes} = [$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_name_end route_grp_count / ],
		'group_by' => [qw/ rt.route_beg rt.route_end node_name_beg node_name_end /],
	},
  	)];