Allow specifying navigation tab for controllers

app/controllers/application_controller.rb

@@ -7,6 +7,7 @@ class ApplicationController < ActionController::Base
   # used, or custom layout method needs to be defined.
 
   helper_method :current_user_disguised?
+  helper_method :current_tab
 
   before_action :authenticate_user!
 
@@ -42,6 +43,16 @@ class ApplicationController < ActionController::Base
     new_user_session_path
   end
 
+  class << self
+    attr_reader :navigation_menu_tab
+    def navigation_tab(name)
+      @navigation_menu_tab = name.to_s
+    end
+  end
+  def current_tab
+    self.class.navigation_menu_tab || controller_name
+  end
+
   private
 
   def rescue_turbo(exception)

app/controllers/units/defaults_controller.rb

@@ -1,4 +1,6 @@
 class Units::DefaultsController < ApplicationController
+  navigation_tab :units
+
   before_action except: :index do
     raise AccessForbidden unless current_user.at_least(:admin)
   end

app/helpers/application_helper.rb

@@ -67,15 +67,16 @@ module ApplicationHelper
   end
 
   def navigation_menu
-    menu_items = [
+    menu_tabs = [
-      #[".test", "weight-kilogram", units_path, :restricted],
+      ['units', "weight-kilogram", :restricted, 'right'],
-      [".units", "weight-kilogram", units_path, :restricted, 'right'],
+      ['users', "account-multiple-outline", :admin],
-      [".users", "account-multiple-outline", users_path, :admin],
     ]
 
-    menu_items.map do |label, image, path, status, css_class|
+    menu_tabs.map do |name, image, status, css_class|
       if current_user.at_least(status)
-        image_tab_to t(label), image, path, class: "tab #{css_class}", current: :active
+        link_to svg_tag("pictograms/#{image}") + t(".#{name}"),
+          {controller: "/#{name}", action: "index"},
+          class: class_names('tab', css_class, active: name == current_tab)
       end
     end.join.html_safe
   end