getExistingConfigSet example

$synchronized = [];

        // Iterates all configurations sets of the file system         foreach ($collection as $item) {
            if (!$item instanceof ConfigSet) {
                throw new Exception(sprintf("Theme %s adds a configuration set which isn't an instance of Shopware\Components\Theme\ConfigSet.", $theme->getTemplate()));
            }

            $item->validate();

            // Check if this set is already defined, to prevent auto increment in the database.             $existing = $this->getExistingConfigSet(
                $template->getConfigSets(),
                $item->getName()
            );

            // If the set isn't defined, create a new one             if (!$existing instanceof Set) {
                $existing = new Set();
                $template->getConfigSets()->add($existing);
            }

            $existing->setTemplate($template);