Update data in has_and_belongs_to_many

Hello, I have my model Email and Group.

I have the migration CreateEmailsGroupsJoin

create_table :emails_groups, :id => false do |t|
t.references :email
t.references :group
end

And in my email_controller, I make a update for my data, but I can’t
change the value of my group_id, in the migration. I can change the
values on email data only.

@email = Email.find( params[ :id ] )

if @email.update_attributes( params[ :email ] )
  flash[ :notice ] = ""
  redirect_to :action => "list"
else
  render "edit"
end

I want to know where I change in this code above to edit my group too.

Thanks

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