Caching

    /**
     * Gets platforms
     *
     * @return \Doctrine\Common\Collections\Collection
     */
    public function getPlatforms()
    {
        if ($this->platforms) {
            return $this->platforms;
        }
        $platforms = new ArrayCollection;
        /** @var CustomerPlatform $cp */
        foreach ($this->cp as $cp) {
            $platforms[] = $cp->getPlatform();
        }
        return $this->platforms = $platforms;
    }