Adding additional search for reference in Joomla component - php

Question

I am using a real estate component that has a front-end admin area to view property listings. An additional field was added to a section called custom fields that is named Ref (Reference). In the admin listings I am trying to add an additional search that searches for that reference. There are three tables involved here:
1j0_cddir_jomestate Which holds the property listings information such as title and description.
1j0_cddir_fields which is the custom fields created.
1j0_cddir_content_has_fields and this holds the values of the custom fields
I would need to join 1j0_cddir_content_has_fields "fields_id" with 1j0_cddir_fields "id" and 1j0_cddir_jomestate "id" must join 1j0_cddir_content_has_fields "content_id"
I am struggling to figure out how to add this function to the models/admin_listings.php so that I may add that search input to the admin_listings view.
<?php
protected $text_prefix = 'COM_JOMESTATE';
protected $user;
function __construct()
{
parent::__construct();
$this->user=JFactory::getUser();
$this->planID=$this->getPlanID();
}
protected function getListQuery()
{
// Initialise variables.
$db = $this->getDbo();
$query = $db->getQuery(true);
if ($this->planID->profile=='company'){
$query->select(
$this->getState(
'list.select',
'a.id AS id, a.title AS title, a.date_created, a.featured, a.users_id, a.published, '.
'c.title as category_title,a.date_publish,a.date_publish_down,ag.first_name,ag.last_name'
)
);
}else{
$query->select(
$this->getState(
'list.select',
'a.id AS id, a.title AS title, a.featured, a.date_created, a.users_id, a.published, '.
'c.title as category_title,a.date_publish,a.date_publish_down'
)
);
}
$query->from($db->quoteName('#__cddir_jomestate').' AS a');
$query->select('COUNT(l.id) AS viewHow, SUM(l.view_item) AS viewSum');
$query->join('LEFT', '#__cddir_statistic AS l ON (l.item_id = a.id AND l.extension=\'com_jomestate\')');
// Join over the categories.
$query->join('LEFT', '#__cddir_categories AS c ON c.id = a.categories_id');
$query->join('LEFT', '#__cddir_categories AS e ON e.id = a.categories_address_id');
if ($this->planID->profile=='company'){
$query->join('LEFT', '#__cddir_agent AS ag ON a.users_id = ag.users_id');
$query->join('LEFT', '#__cddir_company AS co ON co.id = ag.company_id');
}
$query->join('LEFT', '#__users AS u ON u.id = a.users_id');
// Filter by published published
$published = $this->getState('filter.published');
if (is_numeric($published)) {
$query->where('a.published = '.(int) $published);
}
// Filter by category.
$categoryId = $this->getState('filter.categories_id');
if (is_numeric($categoryId) && $categoryId!=0) {
$cat_tbl = JTable::getInstance('Category', 'JomcomdevTable');
$cat_tbl->load($categoryId);
$rgt = $cat_tbl->rgt;
$lft = $cat_tbl->lft;
$baselevel = (int) $cat_tbl->level;
$query->where('c.lft >= '.(int) $lft);
$query->where('c.rgt <= '.(int) $rgt);
}
$search = $this->getState('filter.search');
if (!empty($search)) {
if (stripos($search, 'id:') === 0) {
$query->where('a.id = '.(int) substr($search, 3));
} else {
$search = $db->Quote('%'.$db->escape($search, true).'%');
$query->where('(a.title LIKE '.$search.' OR a.alias LIKE '.$search.')');
}
}
if ($this->planID->profile=='company'){
$query->where('(a.users_id ='.(int) $this->user->id.' or co.users_id='.(int) $this->user->id.')');
}
else $query->where('a.users_id ='.(int) $this->user->id);
$sort = $this->getState('list.sort');
switch($sort) {
case 'most_viewed':
$query->order($db->escape('viewSum DESC, a.date_publish DESC'));
break;
case 'alfa':
$query->order($db->escape('a.title, a.date_publish DESC'));
break;
case 'featured':
$query->order($db->escape('a.featured DESC, a.date_publish DESC'));
break;
case 'latest':
default:
$query->order($db->escape('a.date_publish DESC'));
}
$query->group($db->escape('a.id'));
return $query;
}
function getCategories()
{
$cat_array = array(array('v'=>'','t'=>JText::_('COM_JOMESTATE_ADM_ALL')));
$query = "SELECT title, id, level FROM #__cddir_categories WHERE extension='com_jomestate.jomestate' ORDER BY lft";
$data = $this->_getList($query);
foreach ($data as $row):
for ($i=1;$i<$row->level;$i++) $row->title="   ".$row->title;
$temp_array=array('v'=>$row->id,'t'=>$row->title);
array_push($cat_array,$temp_array);
endforeach;
return $cat_array;
}
/**
* Method to auto-populate the model state.
*
* Note. Calling getState in this method will result in recursion.
*
* #since 1.6
*/
protected function populateState($ordering = null, $direction = null)
{
// Initialise variables.
$app = JFactory::getApplication('site');
// Load the parameters.
// $params = $app->getParams();
$params = JComponentHelper::getParams('com_jomestate');
$menu = $app->getMenu();
$this->active = $menu->getActive();
if ($this->active) {
$menuParams = $this->active->params;
$global = $menuParams->get('global_option');
if(!$global) {
$paramsa = $menuParams->toArray();
$paramsb = $params->toArray();
foreach($paramsa AS $key=>$p) $paramsb[$key] = $p;
$newObject = (object) $paramsb;
$newObject->activeItemid = $this->active->id;
$params->loadObject($newObject);
}
}
$this->setState('params', $params);
$limit = $this->getUserStateFromRequest($this->context.'.list.limit', 'jdItemsPerPage', $params->get('listing_per_page'), 'uint');
$this->setState('list.limit', $limit);
$value = $app->getUserStateFromRequest($this->context . '.list.limitstart', 'limitstart', 0);
$limitstart = ($limit != 0 ? (floor($value / $limit) * $limit) : 0);
$this->setState('list.start', $limitstart);
$search = $this->getUserStateFromRequest($this->context.'.filter.search', 'filter_search', '', 'string');
$this->setState('filter.search', $search);
$categoryId = $this->getUserStateFromRequest($this->context.'.filter.categories_id', 'filter_category', '', 'string');
$this->setState('filter.categories_id', $categoryId);
$sort = $this->getUserStateFromRequest($this->context.'.list.sort', 'jdItemsSort', 'latest', 'string');
$this->setState('list.sort', $sort);
}
public function getUserStateFromRequest($key, $request, $default = null, $type = 'none', $resetPage = true)
{
$app = JFactory::getApplication();
$old_state = $app->getUserState($key);
$cur_state = (!is_null($old_state)) ? $old_state : $default;
$new_state = JRequest::getVar($request, $old_state, 'default', $type);
if (($cur_state != $new_state) && ($resetPage))
{
JRequest::setVar('limitstart', 0);
}
// Save the new value only if it is set in this request.
if ($new_state !== null)
{
$app->setUserState($key, $new_state);
}
else
{
$new_state = $cur_state;
}
return $new_state;
}
public function getUser()
{
return $this->user;
}
public function getToolbar()
{
$document = JFactory::getDocument();
$document->addStyleSheet('administrator/templates/system/css/system.css');
$document->addStyleSheet('components/com_jomestate/assets/css/backadmin.css');
$controller='admin_listings';
jimport('joomla.html.toolbar');
$bar = new JToolBar( 'toolbar' );
if(Joomla_Version::if3()) {
$bar->appendButton( 'standard', 'new', JText::_('COM_JOMESTATE_ADM_ADD'), $controller.'.add', false );
$bar->appendButton( 'standard', 'publish', JText::_('COM_JOMESTATE_ADM_PUBLISH'), $controller.'.publish', false );
$bar->appendButton( 'standard', 'unpublish', JText::_('COM_JOMESTATE_ADM_UNPUBLISH'), $controller.'.unpublish', false );
$bar->appendButton( 'standard', 'delete', JText::_('COM_JOMESTATE_ADM_DELETE'), $controller.'.delete', false );
} else {
$bar->appendButton( 'Frontend', 'new', JText::_('COM_JOMESTATE_ADM_ADD'), $controller.'.add', false );
$bar->appendButton( 'Frontend', 'publish', JText::_('COM_JOMESTATE_ADM_PUBLISH'), $controller.'.publish', false );
$bar->appendButton( 'Frontend', 'unpublish', JText::_('COM_JOMESTATE_ADM_UNPUBLISH'), $controller.'.unpublish', false );
$bar->appendButton( 'Frontend', 'delete', JText::_('COM_JOMESTATE_ADM_DELETE'), $controller.'.delete', false );
}
return $bar->render();
}