Fix agenda category children (#1663)

* fix agenda category children

* references

app/models/communication/website/agenda/category.rb

@@ -52,6 +52,10 @@ class Communication::Website::Agenda::Category < ApplicationRecord
   belongs_to              :parent,
                           class_name: 'Communication::Website::Agenda::Category',
                           optional: true
+  has_many                :children,
+                          class_name: 'Communication::Website::Agenda::Category',
+                          foreign_key: :parent_id,
+                          dependent: :destroy
   has_and_belongs_to_many :events,
                           class_name: 'Communication::Website::Agenda::Event',
                           join_table: :communication_website_agenda_events_categories,
@@ -79,8 +83,9 @@ class Communication::Website::Agenda::Category < ApplicationRecord
   end
 
   def references
-    events +
-    website.menus
+    references = events + website.menus
+    references << parent if parent.present?
+    references
   end
 
   protected

app/models/concerns/pathable.rb

@@ -10,6 +10,7 @@ module Pathable
     end
 
     def update_children_paths
+      return unless respond_to?(:children)
       children.each do |child|
         child.update_column :path, child.generated_path
         child.update_children_paths