after successful registration user should be logged in

front-api/controllers/user.rb

@@ -36,7 +36,8 @@ post '/user' do
   user.from_json(json, false)
 
   if user.save
-    {:status => "ok"}.to_json
+    response.set_cookie('ribica_auth', :path=> '/', :httponly => true, :value=>user.id, :expires=>Time.now+100.year)
+    user.to_json(except: 'password_digest')
   else
     status 400
     user.errors.to_json