I have 2 types of content that are: Videos and Customers.
A video can be related only by 1 customer. I want that when a video is created or edited, will send an email to the customer associated with the video.
"Videos" has a Node_reference that is the customer reference. "Customers" have a user_reference referencing the corresponding user.
Then, using Rules for send mail but I don't know how to get the email of the user from the field node_reference from "Videos" to user_reference of "Customers".
How can I do this?