Using loadMultiple without specifying IDs when a workspace is active causes an error in EntityStorageBase::loadMultiple().
This causes a problem if you need to load all entities while a workspace is active. A work-around is to find out every entity ID before, and pass that to loadMultiple.
TypeError: array_diff_key(): Argument #1 ($array) must be of type array, bool given
/var/www/html/web/core/lib/Drupal/Core/Entity/EntityStorageBase.php:302
/var/www/html/web/core/lib/Drupal/Core/Entity/EntityBase.php:49
This error occurs if no IDs are given because `$flipped_ids` is FALSE, and array_diff_key only works on arrays.
Activate a workspace, then call any loadMultiple function when there is at least one entity of that type in the workspace. Eg, Node::loadMultiple or EntityStorageInterface::loadMultiple.
Needs work
10.1 ✨
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
The last submitted patch, 3: 3338686-3-test-only.patch, failed testing. View results →
Here's the fix for this. The problem is in the entity system though, not in the Workspaces module, so the test needs to be rewritten by implementing hook_entity_preload() somewhere in the entity_test module.