Rails 4 - how to populate checkboxes from a hash?

I have following hash:

CAR_SERVICE = {"Service 1" => 0,
               ...
               "Service 43" => 33}  

and I need to take the data from the hash and display them into 34 checkboxes. Then, I have a database table with this structure:

car_services:
- id
- car_id
- service_number # here goes the value (0 to 33) from the hash

Is there a method or a helper that would take this hash and "display it in checkboxes" and after a user save them, then would automatically checked the respective ones (the ones the a user checked)?

Thank you.

PS: There's a select helper that do that (but I need "the same" functionality for checkboxes):

  <%= f.select :status, CAR_STATUS, {}