An admin who wants to relate a node to a group can go to the group and then create a node from there (/group/{id}/node/create) . The node is then assigned to the group. Or she can assign a already created node (/group/{id}/content/add)

What I need is a way to relate a node to one or multiple groups directly when creating it. Is there a module to do this or some documentation to get me started in developing it?


There is no module that offers this out of the box as far as I know. You'd need some custom programming. I don't know what exactly you need, but here's something that might help to get you started.

Let's assume you want to programmatically relate a node/content to one/multiple groups as soon as the node is created. You could use a hook hook_ENTITY_TYPE_insert() (hook replaced by your custom module's name and ENTITY_TYPE replaced by the entity type (e.g. node).

Here's an example for article nodes:

use Drupal\node\Entity\Node; 
use Drupal\group\Entity\Group;

* Implements hook_ENTITY_TYPE_insert().
function modulename_node_insert(Node $node) {
  if ($node->bundle() == 'article') {
    $pluginId = 'group_node:article';
    // Here create some logic to load/chose the group id's you want to 
    // add the content to
    // ... 
    foreach ($group_ids as $gid) {
      $group = Group::load($gid);
      $group->addContent($node, $pluginId);

This would automatically add the (article) nodes that are created to one or multiple groups. This is just a basic example of how to code the differnt parts. You can however make it as complex as you need. Hope this helps

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