params

# params
{"utf8"=>"✓",
 "authenticity_token"=>"lHpn6sCR208J+vxmdoM1h5lbni8AMKZz2NrcOVcBGFo=",
 "response"=>
  {"answers_attributes"=>
    {"0"=>{"question_id"=>"13", "value"=>"E"},
     "1"=>{"question_id"=>"14", "value"=>"E"},
     "2"=>{"question_id"=>"15", "value"=>"ewrq"},
     "3"=>{"question_id"=>"16", "value"=>""},
     "4"=>{"question_id"=>"17", "value"=>""},
     "5"=>{"question_id"=>"18"},
     "6"=>{"question_id"=>"19", "value"=>"1:30am"},
     "7"=>{"question_id"=>"20", "value"=>"06/04/2014"},
     "8"=>{"question_id"=>"21", "value"=>""},
     "9"=>{"question_id"=>"22"},
     "10"=>{"question_id"=>"23", "value"=>"No"},
     "11"=>{"question_id"=>"24", "value"=>"06/05/1989"},
     "12"=>{"question_id"=>"25", "value"=>["A", "B", "C", "D", "E"]},
     "13"=>{"question_id"=>"26"}}},
 "commit"=>"Submit form",
 "action"=>"create",
 "controller"=>"responses",
 "form_id"=>"22"}
 

response_controller.rb

def response_params
  parameters = params.require(:response).permit(:answers_attributes => [:question_id, :value])
  parameters.merge(:ip_address => request.remote_ip)
end