Raise an exception if #total_count is called on a non-count paginable scope

kaminari-activerecord/lib/kaminari/activerecord/active_record_relation_methods.rb

@@ -78,5 +78,11 @@ module Kaminari
       load unless loaded?
       @records.empty?
     end
+
+    # Force to raise an exception if #total_count is called explicitly.
+    def total_count
+      raise "This scope is marked as a non-count paginable scope and can't be used in combination " \
+            "with `#paginate' or `#page_entries_info'. Use #link_to_next_page or #link_to_previous_page instead."
+    end
   end
 end