Override bundle template from another bundle in Symfony 4/5

Question

because bundle inheritance is deprecated since Symfony 3.4 and will be removed in 4.0, I\'m finding a new solution. I have:

• Application
• FooBundle

Answer 1

I will show how it looks in my case(Symfony 5.1). To overwrite views for bundles JMoseCommandSchedulerBudnle and TwigBundle:

1. Create your own directory with custom third party bundle templates(I put them In Resources/views/bundles):

2. Create folders for each bundle where you want to override templates:

3. Create custom templates(for example to create custom Twig Error Pages):

4. Implement PrependExtensionInterface and add custom paths to the Twig Extension configuration:

class AppngCmsExtension extends Extension implements PrependExtensionInterface {
    public function load(array $configs, ContainerBuilder $container)
    {
        $loader = new YamlFileLoader($container, new FileLocator(__DIR__ . '/../Resources/config'));
        $loader->load('services.yaml');
    }

    public function prepend(ContainerBuilder $container)
    {
        // I recommend using FileLocator here 
        $thirdPartyBundlesViewFileLocator = (new FileLocator(__DIR__ . '/../Resources/views/bundles'));

        $container->loadFromExtension('twig', [
            'paths' => [
                $thirdPartyBundlesViewFileLocator->locate('JMoseCommandSchedulerBundle') => 'JMoseCommandScheduler',
                $thirdPartyBundlesViewFileLocator->locate('TwigBundle') => 'Twig',
            ],
        ]);
    }
}