I can't seem to get this to work. I've searched and search, and maybe I'm not using the correct terminology, but I need to add a custom field to a Relation that reads a value from the Entity its related to. Or another way to put this, I need a field from the Relation to update a field in an Entity when the Relation is updated. Example:

Entity -> Worker
Relation -> Employed At
Entity -> Company

I want to update my custom field "classification" through the Employed At Relation and then see that change reflected in the "classification" custom field in my Worker Entity.

1 Answer 1


If you are talking about the Relation module, then you can use Rules to trigger entity updates whenever a relationship (which is also an entity) changes.

The workflow would be like this :

  1. Trigger on entity update.
  2. Check that entity is a relation.
  3. Update linked entity.

Check the video documentation on Relation, there are two (1, 2) of them talking about Rules.

  • When you say "1. Trigger on entity update", do you mean "trigger on Relation update"?
    – jhoffmcd
    Dec 13, 2012 at 5:44
  • Yes, bear in mind that a relation is an entity from drupal point of view.
    – drcelus
    Dec 13, 2012 at 6:39
  • Thanks, those videos helped get familiar with it all. I can get a the relation type I want, but not sure how to get the linked entity. For Events I have "After Updating a Relation", for Conditions I have "Data Comparison" which I use to select the correct Relation Type. This is good because it gives me access to the fields that I need from that specific Relation. I've tried a few Actions, Fetch Entity by Property or ID, but I'm hitting a wall. I think I might be missing something concerning endpoints?
    – jhoffmcd
    Dec 13, 2012 at 16:13
  • What do you mean by endpoints ?
    – drcelus
    Dec 14, 2012 at 6:56
  • Endpoints (an array I'm assuming) being the entities on either end of the Relation. Ex: Worker = endpoint[0], Company = endpoint[1]
    – jhoffmcd
    Dec 14, 2012 at 22:45

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