RainLab\Builder\Classes\MigrationModel::isApplied PHP Method

    public function isApplied()
    {
        if ($this->isNewModel()) {
            return false;
        }
        $versionManager = VersionManager::instance();
        $unappliedVersions = $versionManager->listNewVersions($this->pluginCodeObj->toCode());
        return !array_key_exists($this->originalVersion, $unappliedVersions);
    }