Check if node update is published

Question

I've a content type with a workflow. I have to notify users when the published version of the node is update.

Have I to check which transition is used? How?

I'm using an hook_node_presave.

[EDIT] It seems that check if it's the default revision could be right:

 $entity->isDefaultRevision();

From draft to draft is false. From draft to published is true. From published to published is true.

Could be the right way?

Answer 1

As an alternative, consider using the Content moderation notifications module:

Allows notifications to be sent to all users of a particular role, or to the content's author when a piece of content is transitioned from one state to another via core's content_moderation module.

I've used it with good results in several sites.

Answer 2

You can simply get the Moderation state of node in the hook_node_presave(). like below:

$node->get('moderation_state')->getString()

It will give you the string like publish or unpublish.