habtm - need some clarification

I have a groups, users and tasks models.

Groups has a HABTM to users.
Users has a HABTM to groups.
Users has many tasks.

From the tasks model, I am trying to find out which group the user
belongs to. Once I have this information, I plan to put into a session
variable so I only need to query this once while the user is in
session.

But, how do I make this query efficiently?

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