Server.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Server extends Model
{

    protected $fillable = ["token"];

    /**
     * Last record from this server (used for caching).
     * @var String
     */
    private $last_record = null;

    private static $sensors = [
        \App\Sensor\LoadAvg::class,
        \App\Sensor\MemInfo::class,
        \App\Sensor\Ifconfig::class,
        \App\Sensor\ListeningPorts::class,
        \App\Sensor\Reboot::class,
        \App\Sensor\Updates::class,
        \App\Sensor\Disks::class,
        \App\Sensor\Inodes::class,
        \App\Sensor\Ssacli::class,
        \App\Sensor\Perccli::class,
        \App\Sensor\Date::class,
        \App\Sensor\ClientVersion::class,
        \App\Sensor\Heartbeat::class,
        \App\Sensor\DiskEvolution::class
    ];

    public function __construct(array $attributes = array())
    {
        $attributes["token"] = str_random(32);
        parent::__construct($attributes);
    }

    public function organization()
    {
        return $this->belongsTo("App\Organization");
    }

    public function lastRecord()
    {
        if ($this->last_record == null) {
            $collection = \Mongo::get()->monitoring->records;
            $this->last_record =  $collection->findOne(
                ["server_id" => $this->id],
                ["sort" => ["_id" => -1]]
            );
        }

        return $this->last_record;
    }

    /**
     * Return the last record if it contains the field $field,
     * otherwise return null.
     * @param string $field
     * @return string
     */
    public function lastRecordContaining(string $field)
    {
        if (isset($this->lastRecord()->$field)) {
            return $this->lastRecord();
        }