Update HABTM

Hey guys I am new to rails and was wondering how you update HABTM
tables. I have a join table called platforms and another table called
games. They are joined with the table games_platforms.

I have a view that creates a multi-select pick list of all the various
platforms. I figured out how to repopulate the picklist with the
correct items stored in my join table but I don’t know how to update
them. Currently, I have a params[:games] that has the input from the
list and I know the game courtesy of the params[:id]. Any help would be
greatly appreciated it. Thanks.

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