AssociateAction, but it doesn't work because it tries to change the wrong foregin key on the related model. THe relationship works as it should and items are listed in the RelationManager. The problem is that the AssociateAction uses a pluralised foregin key when it should be use a singular, for example posts_id instead of post_id. I have even tried specifing the foregin key in the relation on the model, but that did not help. I have verified that there is nothing wrong with the relation setup between the models and the convention is FK with singular name.