Active model serializer deprication smash

app/helpers/application_helper.rb

@@ -174,4 +174,44 @@ module ApplicationHelper
     options[:onclick] = function
     link_to title, 'javascript:void(0)', options
   end
+
+  # Return active or nil based on the given route spec
+  #   %li{ class: active_class('users') # true if controller is users, false otherwise
+  #   %li{ class: active_class('pages#about') # true if controller is pages and action is about
+  def active_class(*route_specs)
+    options = route_specs.extract_options!
+    active_class = options.delete(:active_class) || 'active'
+    return_class = Array.wrap(options.delete(:default_class))
+    if route_specs.map{|rs| current_route_spec?(rs) }.any?
+      if params.slice(*options.keys) == options.stringify_keys
+        return_class << active_class
+      end
+    end
+    return_class
+  end
+
+  # Check if the current route matches the route given as argument.
+  # The syntax is meant to be a bit similar to specifying routes in
+  # `config/routes.rb`.
+  #   current_route_spec?('products') #=> true if controller name is products, false otherwise
+  #   current_route_spec?('products#show') #=> true if controller_name is products AND action_name is show
+  #   current_route_spec?('#show') #=> true if action_name is show, false otherwise
+  #NOTE: this helper is tested through the active_class helper
+  def current_route_spec?(route_spec)
+    controller, action = route_spec.split('#')
+    if controller and controller_path == controller
+      if action
+        if action_name == action
+          true
+        end
+      else
+        # no action means all actions of controller
+        true
+      end
+    else
+      if action_name == action
+        true
+      end
+    end
+  end
 end