1 files changed, 42 insertions, 0 deletions
diff --git a/lib/api/paging/index_paginator.rb b/lib/api/paging/index_paginator.rb
new file mode 100644
index 000000000..8dc5108e0
--- /dev/null
+++ b/lib/api/paging/index_paginator.rb
@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+module Api
+  module Paging
+    class IndexPaginator
+      def initialize(query_base, current_page, limit)
+        @query_base = query_base
+        @current_page = current_page.to_i
+        @limit = limit.to_i
+      end
+
+      def page_data
+        @page_data ||= @query_base.paginate(page: @current_page, per_page: @limit)
+        @max_page = (@query_base.count * 1.0 / @limit * 1.0).ceil
+        @max_page = 1 if @max_page < 1
+        @page_data
+      end
+
+      def next_page(for_url=true)
+        page_data
+        return nil if for_url && @current_page == @max_page
+
+        return "page=#{@current_page + 1}" if for_url
+
+        IndexPaginator.new(@query_base, @current_page + 1, @limit)
+      end
+
+      def previous_page(for_url=true)
+        page_data
+        return nil if for_url && @current_page == 1
+
+        return "page=#{@current_page - 1}" if for_url
+
+        IndexPaginator.new(@query_base, @current_page - 1, @limit)
+      end
+
+      def filter_parameters(parameters)
+        parameters.delete(:page)
+      end
+    end
+  end
+end