public class func removeUserAtIndexPath(indexPath: NSIndexPath) {
        let user = OneChats.getChatsList().objectAtIndex(indexPath.row) as! XMPPUserCoreDataStorageObject

        sharedInstance.removeMyUserActivityFromCoreDataStorageWith(user: user)
        sharedInstance.removeUserActivityFromCoreDataStorage(user: user)
        removeUserFromChatList(user: user)
    }

    public class func removeUserFromChatList(user user: XMPPUserCoreDataStorageObject) {
        if sharedInstance.chatList.containsObject(user) {
            sharedInstance.chatList.removeObjectIdenticalTo(user)
            sharedInstance.chatListBare.removeObjectIdenticalTo(user.jidStr)
        }
    }

    public class func addUserToChatList(jidStr jidStr: String) {
        if !knownUserForJid(jidStr: jidStr) {
            sharedInstance.chatList.addObject(OneRoster.userFromRosterForJID(jid: jidStr)!)
            sharedInstance.chatListBare.addObject(jidStr)
        }
    }

    func removeUserActivityFromCoreDataStorage(user user: XMPPUserCoreDataStorageObject) {
        let moc = OneMessage.sharedInstance.xmppMessageStorage?.mainThreadManagedObjectContext
        let entityDescription = NSEntityDescription.entityForName("XMPPMessageArchiving_Message_CoreDataObject", inManagedObjectContext: moc!)
        let request = NSFetchRequest()
        let predicateFormat = "bareJidStr like %@ "

        let predicate = NSPredicate(format: predicateFormat, user.jidStr)
        request.predicate = predicate
        request.entity = entityDescription

        do {
            let results = try moc?.executeFetchRequest(request)
            for message in results! {
                moc?.deleteObject(message as! NSManagedObject)
            }
        } catch _ {
        }
    }

    func removeMyUserActivityFromCoreDataStorageWith(user user: XMPPUserCoreDataStorageObject) {
        let moc = OneMessage.sharedInstance.xmppMessageStorage?.mainThreadManagedObjectContext
        let entityDescription = NSEntityDescription.entityForName("XMPPMessageArchiving_Message_CoreDataObject", inManagedObjectContext: moc!)
        let request = NSFetchRequest()
        let predicateFormat = "streamBareJidStr like %@ "

        if let predicateString = NSUserDefaults.standardUserDefaults().stringForKey("kXMPPmyJID") {
            let predicate = NSPredicate(format: predicateFormat, predicateString)
            request.predicate = predicate
            request.entity = entityDescription

            do {
                let results = try moc?.executeFetchRequest(request)
                for message in results! {
                    var element: DDXMLElement!
                    do {
                        element = try DDXMLElement(XMLString: message.messageStr)
                    } catch _ {
                        element = nil
                    }

                    if element.attributeStringValueForName("to") != NSUserDefaults.standardUserDefaults().stringForKey("kXMPPmyJID")! && !(element.attributeStringValueForName("to") as NSString).containsString(NSUserDefaults.standardUserDefaults().stringForKey("kXMPPmyJID")!) {
                        if element.attributeStringValueForName("to") == user.jidStr {
                            moc?.deleteObject(message as! NSManagedObject)
                        }
                    }
                }
            } catch _ {
            }
        }
    }

// I call it:
OneChats.removeUserAtIndexPath(indexPath)