并行处理统计

lib/tasks/statistic_subject_info.rake

@@ -89,7 +89,7 @@ namespace :subjects do
     buffer_size = 0
     column_value = "subject_id, shixun_id, stage, shixun_name, challenge_count, course_count, " +
         "school_count, used_count, passed_count, evaluate_count, passed_ave_time, created_at, updated_at"
-    subjects.find_each(batch_size: 50) do |s|
+    subjects.find_in_batches(batch_size: 50) do |s|
       Parallel.each(s, in_processes: 4) do |subject|
         puts("---------------------shixun_info_statistic: #{subject.id}")
         Rails.logger.info("---------------------shixun_info_statistic: #{subject.id}")