Revert "application model: move pagination extension to concern."

This reverts commit 7855e36d17.

Broke pagination due to incorrect memoization causing @paginator_count
to be shared between requests.

app/logical/pagination_extension.rb

@@ -3,13 +3,6 @@ module PaginationExtension
 
   attr_accessor :current_page, :records_per_page, :paginator_count, :paginator_mode
 
-  def paginated_search(params, defaults: {}, count_pages: params[:search].present?)
-    search_params = params.fetch(:search, {}).permit!
-    search_params = defaults.merge(search_params).with_indifferent_access
-
-    search(search_params).paginate(params[:page], limit: params[:limit], search_count: count_pages)
-  end
-
   def paginate(page, limit: nil, count: nil, search_count: nil)
     @records_per_page = limit || Danbooru.config.posts_per_page
     @records_per_page = @records_per_page.to_i.clamp(1, 1000)

app/models/application_record.rb

@@ -4,7 +4,21 @@ class ApplicationRecord < ActiveRecord::Base
   include Mentionable
   extend HasBitFlags
   extend Searchable
-  extend PaginationExtension
+
+  concerning :PaginationMethods do
+    class_methods do
+      def paginate(*args, **options)
+        extending(PaginationExtension).paginate(*args, **options)
+      end
+
+      def paginated_search(params, defaults: {}, count_pages: params[:search].present?)
+        search_params = params.fetch(:search, {}).permit!
+        search_params = defaults.merge(search_params).with_indifferent_access
+
+        search(search_params).paginate(params[:page], limit: params[:limit], search_count: count_pages)
+      end
+    end
+  end
 
   concerning :PrivilegeMethods do
     class_methods do