Checkbox arrays

[Jito]

Is there a way to properly do a checkbox array?

I've got something like this:

-MeasureUnit.where(:active => true, :id => nil).each do |mu|

  = f.check_box "measure_unit_ids[]", mu.name, {:checked => @conf.measure_unit.include?(mu)}, mu.id

But all the label and input elements created get the same name attribute, so clicking any of the labels un/checks the first element.

How could I do this?