Ruby on Rails Ransack Search

I want to search in check boxes containing price ranges using ransack on ruby on rails, how to do that?
I want it to be like that form.  I tried using this but it doesnt work 

enter code here<%= check_box_tag('q[price_in][]', "100-160" ) %>

For example to be like this
$50-$100 
$100-$250 
$250-$500 
$500 & Above