Add universal paginator to use page/per on search

app/resources/anime_resource.rb

@@ -22,6 +22,14 @@ def self._search_service
     AnimeSearchService if Flipper[:typesense_search].enabled?(User.current)
   end
 
+  def self._paginator
+    if Flipper[:typesense_search].enabled?(User.current)
+      :universal
+    else
+      JSONAPI.configuration.default_paginator
+    end
+  end
+
   def self.updatable_fields(context)
     super - [:nsfw]
   end

lib/universal_paginator.rb

@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+
+class UniversalPaginator < JSONAPI::Paginator
+  attr_reader :params
+
+  def initialize(params)
+    @params = params
+    # Initialize sub-paginator
+    paginator
+  end
+
+  def offset?
+    params[:offset].present? || params[:limit].present?
+  end
+
+  def page?
+    !!offset?
+  end
+
+  def paginator
+    @paginator ||= paginator_class.new(params)
+  end
+
+  def paginator_class
+    offset? ? OffsetPaginator : PagedPaginator
+  end
+
+  delegate :calculate_page_count, to: :paginator
+  delegate :links_page_params, to: :paginator
+
+  def apply(relation, _order_options)
+    if offset?
+      paginator.apply(relation, _order_options)
+    else
+      # We apply the PagedPaginator logic ourselves because it uses offset/limit
+      # We want to have page/per method calls to be applied to the relation
+      relation = relation.page(params[:number]) if params[:number].present?
+      relation = relation.per(params[:size]) if params[:size].present?
+    end
+  end
+end