Make page tree loader class configurable

If someone wants to adjust how we preload whole
page trees they can confgure a different class.

Signed-off-by: Thomas von Deyen <[email protected]>

Author: tvdeyen

app/controllers/alchemy/admin/pages_controller.rb

@@ -57,7 +57,7 @@ def index
           items = items.page(params[:page] || 1).per(items_per_page)
           @pages = items
         elsif @current_language.root_page
-          @root_page = Alchemy::PageTreePreloader.new(
+          @root_page = Alchemy.config.page_tree_loader_class.new(
             page: @current_language.root_page,
             user: current_alchemy_user
           ).call
@@ -173,7 +173,10 @@ def fold
         respond_to do |format|
           format.turbo_stream do
             if was_folded
-              @page = PageTreePreloader.new(page: @page, user: current_alchemy_user).call
+              @page = Alchemy.config.page_tree_loader_class.new(
+                page: @page,
+                user: current_alchemy_user
+              ).call
             else
               head :ok
             end

app/controllers/alchemy/api/pages_controller.rb

@@ -29,7 +29,10 @@ def nested
       @page = Page.find_by(id: params[:page_id]) || Language.current_root_page
 
       # Preload the full tree from this page
-      preloaded_page = PageTreePreloader.new(page: @page, user: current_alchemy_user).call
+      preloaded_page = Alchemy.config.page_tree_loader_class.new(
+        page: @page,
+        user: current_alchemy_user
+      ).call
 
       render json: PageTreeSerializer.new(
         preloaded_page,

lib/alchemy/configurations/main.rb

@@ -378,6 +378,14 @@ class Main < Alchemy::Configuration
       # Default is 1 hour.
       #
       option :update_check_cache_duration, :integer, default: 1
+
+      # === Page tree loader class
+      #
+      # The class used to preload page trees with all associations and children.
+      # Must respond to .new(page:, user:).call
+      #
+      # @default Alchemy::PageTreePreloader
+      option :page_tree_loader_class, :class, default: "Alchemy::PageTreePreloader"
     end
   end
 end