CheckBox and Ruby on Rails

I have two questions:

1. I have a checkbox on a form and after submit I need to check the
status of the checkbox. Any idea how to see what the checkbox is set
to? I am assuming this must be done in the controller or model but
cannot figure it out.

2. On load I am checking for a cookie and need to determine if the
checkbox should be checked or unchecked. Is there a way for me to do
this from the controller and actually set the checkbox to checked or
unchecked.