After lot of research, finally got the way to render blocks in twig files.
Basically there are two type of renders.
- When there is an existing instance of the block in the layout. The the block can be rendered in twig using preprocess as
$block = Block::load('mediablock'); $variables['social_links'] = \Drupal::entityTypeManager() ->getViewBuilder('block') ->view($block);
- There is no instance or configurations for the block. Then in the preprocessor we need to create the instance, build the block and then render it
$block_manager = \Drupal::service('plugin.manager.block'); $config = ; $plugin_block = $block_manager->createInstance('farmjournal_social_sharing', $config); $render = $plugin_block->build(); $variables['farmjournal_social_sharing'] = render($render);