Node access user reference

Question

Main Modules:

1. Node access user reference

2. Node access node reference

3. Flags

4. Rules

I'm trying to give access to a user that clicks on a Join Project flag link.

I have a User Reference Field attached to a node call Project. I'm wanting to tell Rules to add that user to the Node Access User Reference field, AKA "Join the group"

Answer 1

There is as well: http://drupal.org/project/nodeaccess_autoreference module which is working in similar way. But I'm not sure if this solves your problem.