I'm trying to replicate groups with Toolset, similar to the ones of buddypress.
So a user can create a group CPT, make it private or public, join request, and then only users who were granted access can navigate the group.
I assume you are going to setup many-to-many relationship between WordPress user and post type "group", for example:
- One user can connect with multiple "group" posts
- One "group" post can connect with multiple WordPress users
There isn't such kind of built-in feature with custom user field, and it will require custom codes, and might conduct other unexpected result. So I suggest you try with the intermetiate post type as I mentioned above: https://toolset.com/forums/topic/groups/#post-1602025