How to add a combo drop-down user list in vtigercrm? - vtiger

Question

I'm using existing Task module under the Project module. I would like to
assign particular task to multiple workers. Meaning that group of people
will together complete the task.
I already have workers as users in my vtigercrm. So if i make a user selection
multiple for assigning single task it could be easier to handle this
use-case.
This use-case already have in Calendar module but i'm unable to understand how they implement.
I have a thorough knowledge on how to create custom user list drop-down in any module and i created lot more for my custom modules. Now stuck with the same scenario having multiple at a time.
I tried like this in module.php, but it is not working.
$users = Vtiger_Module::getInstance('Users');
$module = Vtiger_Module::getInstance('MyModule');
$module->unsetRelatedList($users, 'Users', 'get_related_list');
$module->setRelatedList($users, 'Users', array('SELECT'), 'get_related_list');
Can anyone help me to get it done?

Answer 1

It is possible when you understood the Invite users field in Calender envent creation. Here the field must be multi-selection.
You need to deal with vtiger_salesmanactivityrel table for inserting the multiple users and for showing in detail view.
Here is the code to handle inviteusers.
//Handling for invitees
$selected_users_string = $_REQUEST['inviteesid'];
$invitees_array = explode(';',$selected_users_string);
$this->insertIntoInviteeTable($module,$invitees_array);
function insertIntoInviteeTable($module,$invitees_array)
{
global $log,$adb;
$log->debug("Entering insertIntoInviteeTable(".$module.",".$invitees_array.") method ...");
if($this->mode == 'edit'){
$sql = "delete from vtiger_invitees where activityid=?";
$adb->pquery($sql, array($this->id));
}
foreach($invitees_array as $inviteeid)
{
if($inviteeid != '')
{
$query="insert into vtiger_invitees values(?,?)";
$adb->pquery($query, array($this->id, $inviteeid));
}
}
$log->debug("Exiting insertIntoInviteeTable method ...");
}
Hope it would give you a better idea.