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Using a workflow (and anything else Middle Tier including scripting), can you remove a single name from a multiple-user Person or Groups field?

I'm toying with the idea of a "subscription" model:

  • User Selects "Subscribe Button"
  • User is directed to workflow initiation form - checks box
  • Workflow creates entry in a list with Created By
  • Workflow takes Created By and adds it to a Multi-User People/Groups Field (By creating string "{Multi People Field}; {Created By}"
  • When new items are added to a particular folder in a discussion list, a workflow sends the new content in a nicely-formatted e-mail to Multi-User People/Groups Field (turning that field into a workflow variable that let's Designer send the e-mail)

Great. Using some other workflow magic, I could display, in this particular discussion folder, who is currently subscribed and therefore how many subscriptions and use popularity to rank discussions...etc. And I know multi-user People/Groups fields eventually have a limit - I think that's solveable. I think you can even mess with the XML of the workflow file to BCC the listing of people.

None of this is worthwhile, however, unless a person can easily remove him/herself from that multi-user People/Groups field. An "Unsubscribe" process, if you will.

share|improve this question this case, my users who would subscribe to an item each exist as a unique item in a list. If that list captures "preferred e-mail" and a calculated column adds a space before the value, I could maybe have a lookup from the target list - so e-mails would go to a string value like "Lastname1, firstname1; lastname2, firstname2" - now I just need to find a way to filter the multi lookup field based on current user. – Cory M Mar 29 '12 at 17:55

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