Pimcore\Model\Object\Concrete::resolveDependencies PHP Method

    public function resolveDependencies()
    {
        $dependencies = parent::resolveDependencies();
        // check in fields
        if ($this->getClass() instanceof ClassDefinition) {
            foreach ($this->getClass()->getFieldDefinitions() as $field) {
                $key = $field->getName();
                $dependencies = array_merge($dependencies, $field->resolveDependencies($this->{$key}));
            }
        }
        return $dependencies;
    }