iTop - Get caller's IP in tickets - customization

Question

In iTop, How is it possible to save caller's IP address in tickets (User Request and Incident)
I tried to modify datamodel.itop-tickets.xml in my extension module. I added a field named 'ip' successfully but in <methods> section I can not get client's IP using $_SERVER['REMOTE_ADDR'] .
<methods>
<method id="DBInsertNoReload" _delta="redefine">
<static>false</static>
<access>public</access>
<type>Overload-DBObject</type>
<code><![CDATA[
public function DBInsertNoReload()
{
$oMutex = new iTopMutex('ticket_insert');
$oMutex->Lock();
$iNextId = MetaModel::GetNextKey(get_class($this));
$sRef = $this->MakeTicketRef($iNextId);
$this->Set('ref', $sRef);
$iKey = parent::DBInsertNoReload();
$oMutex->Unlock();
return $iKey;
$this->Set('ip', $_SERVER['REMOTE_ADDR'] );
}
]]></code>
</method>
</methods>

Answer 1

There is another option, in itop customs extension you can include another datamodel. (you can use XML or PHP datamodel).
So, you have to create a new php file and write the class you want inside to extend the datamodel. You have to extends them with : https://www.combodo.com/documentation/api-ref-extensions/packages/Extensibility.html
If you use the interface "iApplicationObjectExtension", you can use the method OnDBInsert to set other field in your object/
for example
Class YourClassName implements iApplicationObjectExtension {
public function OnIsModified($oObject){}
public function OnCheckToWrite($oObject){}
public function OnCheckToDelete($oObject){}
public function OnDBUpdate($oObject, $oChange = null){}
public function OnDBDelete($oObject, $oChange = null){}
public function OnDBInsert($oObject, $oChange = null) {
if ($oObject instanceof UserRequest) {
// Do what you want with $oObject
$oObject->DBUpdate(); // Update object
}
}
}

Answer 2

After lots of attempts I finally found the solution :)
We must redefine a method of type LifeCycleAction and so I've just redefined ComputeImpactedItems method in both Inciudent and UserRequest classes.
For make it much clear I show one of them here:
<class id="Incident">
<methods>
<method id="ComputeImpactedItems" _delta="redefine">
<static>false</static>
<access>public</access>
<type>LifecycleAction</type>
<code><![CDATA[ public function ComputeImpactedItems()
{
// This method is kept for backward compatibility
// in case a delta redefines it, but you may call
// UpdateImpactedItems directly
$this->UpdateImpactedItems();
// This line is added by this exstension for saving caller's ip
$this->Set('ip', $_SERVER['REMOTE_ADDR']);
}]]></code>
</method>
</methods>
</class>