Count lettings logs after writting export files (#1934)

* Count lettings logs after writting export files

* lint

app/services/exports/lettings_log_export_service.rb

@@ -77,14 +77,13 @@ module Exports
 
       logs_count = retrieve_lettings_logs(start_time, recent_export, full_update).filter_by_year(collection).count
       @logger.info("Creating #{archive} - #{logs_count} logs")
-      manifest_xml = build_manifest_xml(logs_count)
       return {} if logs_count.zero?
 
       zip_file = Zip::File.open_buffer(StringIO.new)
-      zip_file.add("manifest.xml", manifest_xml)
 
       part_number = 1
       last_processed_marker = nil
+      total_logs = 0
 
       loop do
         lettings_logs_slice = if last_processed_marker.present?
@@ -105,9 +104,13 @@ module Exports
         zip_file.add("#{archive}_#{part_number_str}.xml", data_xml)
         part_number += 1
         last_processed_marker = lettings_logs_slice.last.created_at
+        total_logs += lettings_logs_slice.count
         @logger.info("Added #{archive}_#{part_number_str}.xml")
       end
 
+      manifest_xml = build_manifest_xml(logs_count)
+      zip_file.add("manifest.xml", manifest_xml)
+
       # Required by S3 to avoid Aws::S3::Errors::BadDigest
       zip_io = zip_file.write_buffer
       zip_io.rewind