html - How to check if a check_box in simple_form has been checked -

here's html produces

f.check_box :tos 

produces

<input name="user[tos]" type="hidden" value="0">  <input id="user_tos" name="user[tos]" type="checkbox" value="1"> 

what need in controller check if it's been checked?

assuming mean want find out if checked upon submission, it's value via params[:user][:tos]. submitted data form stored in params hash, , location equivalent name attribute of input. instance:

if params[:user][:tos] == "1"     # whatever here if checked else     # whatever here if unchecked end 

if need react state of being checked on web page, cannot done controller, , must use javascript. like:

if (document.getelementbyid('user_tos').checked == 1){     // whatever here if checked } else {     // whatever here if unchecked } 

addendum

when receiving parameter via controller, don't use value create new object (i.e. thing.create( thing_value: params[:user][:tos] )). if y our goal, should "strong parameters," , how rails implements them.

addendum 2

thanks ruby's duck typing (dynamic typing) , nature of params hash, url encoding, etc. integers sent via params, in case params[:user][:tos], mutated string. you'll need check "1" (the string form) not 1 (the int form).