RAILS SELECT TAG WITH MULTIPLE VALUES PRE-SELECTED

I am trying to have a multiple select box. select box will contain all the stores in the DB but the ones that the user belongs to will be selected.

We can use this :-

 <%= select("id", "  ", options_for_select(User.all, :selected =>  id ), {:include_blank => 'Please Select'})    %>

We can follow link for the same :-

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