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/home/develito/www/components/com_abook/models/fields/authors_no.php

<?php
/**
 * @package Joomla
 * @subpackage Abook
 * @copyright (C) 2010-2019 Federica Ugolotti
 * @license GNU/GPL, see LICENSE.php
 * Abook is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License 3
 * as published by the Free Software Foundation.

* Abook is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

* You should have received a copy of the GNU General Public License
 * along with Abook; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
// no direct access
defined('_JEXEC') or die;

jimport('joomla.html.html');
jimport('joomla.form.formfield');
jimport('joomla.form.helper');
JFormHelper::loadFieldClass('list');

class JFormFieldAbauthorslist extends JFormFieldList
{
        /**
         * The form field type.
         *
         * @var         string
         * @since       1.6
         */
        protected $type = 'abauthorslist';

/**
         * Method to get the field options.
         *
         * @return      array   The field option objects.
         * @since       1.6
         */
        public function getOptions()
        {
                // Initialize variables.
                $options = array();

$db = JFactory::getDBO(); 
                $query  = $db->getQuery(true);

$query->select('CONCAT(a.lastname, " ", a.name) AS text, a.id AS value');
                $query->from('#__abauthor AS a');
		$query->join('#__abbookauth AS ba ON ba.idauth=b.id');
		$query->join('#__abbook AS b ON b.id=ba.idbook');
		$query->join('#__abcategories AS c ON c.id=b.catid');
		$query->where();
                $query->order('weather_name');

// Get the options.
                $db->setQuery($query);
		try
                {
                        $options = $db->loadObjectList();
                }
                catch (RuntimeException $e)
                {
                        JFactory::getApplication()->enqueueMessage($e->getMessage(), 'error');
                }

array_unshift($options, JHtml::_('select.option', '0', JText::_('COM_PHPMYSPORT_SELECT')));

return $options;
        }
}