1

lib/tasks/statistic_subject_info.rake

@@ -8,11 +8,10 @@ namespace :subjects do
     column_value = "subject_id, study_count, course_study_count, initiative_study, passed_count, course_used_count, " +
         "school_used_count, created_at, updated_at"
     buffer_size = 0
-    str = ""
+    str = []
     subjects.find_in_batches(batch_size: 50) do |s|
       Parallel.each_with_index(s, in_processes: 4) do |subject, index|
         buffer_size += 1
-        str += ", " unless str.empty?
         puts("---------------------data_statistic: #{subject.id}")
         Rails.logger.info("---------------------data_statistic: #{subject.id}")
         data = Subjects::DataStatisticService.new(subject)
@@ -20,13 +19,13 @@ namespace :subjects do
         next if study_count == 0
         course_study_count = data.course_study_count
         initiative_study = study_count - course_study_count
-        str += ("(#{subject.id}, #{study_count}, #{course_study_count}, #{initiative_study}, " +
+        str << ("(#{subject.id}, #{study_count}, #{course_study_count}, #{initiative_study}, " +
             "#{data.passed_count}, #{data.course_used_count}, #{data.school_used_count}, " +
             "'#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}', '#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}')")
         puts "index: #{index}; worker_number: #{Parallel.worker_number}"
         puts "####str: #{str}"
         if buffer_size == 1000 || subject == s.last
-          sql = "REPLACE INTO subject_records(#{column_value}) VALUES #{str}"
+          sql = "REPLACE INTO subject_records(#{column_value}) VALUES #{str.join(",")}"
           puts sql
           ActiveRecord::Base.connection.execute sql
           str = ""
@@ -35,7 +34,7 @@ namespace :subjects do
       end
     end
     if buffer_size > 0
-      sql = "REPLACE INTO subject_records(#{column_value}) VALUES #{str}"
+      sql = "REPLACE INTO subject_records(#{column_value}) VALUES #{str.join(",")}"
       puts sql
       ActiveRecord::Base.connection.execute sql
     end