rakeタスクの進捗を1個ずつ出しており時間が必要以上にかかってしまっていた問題を修正

lib/tasks/mastodon.rake

@@ -8,18 +8,22 @@ namespace :mastodon do
     desc 'migrate AccountConversation'
     task accountConversation: :environment do
       migrated  = 0
-      Status.unscoped.local.where(visibility: :direct).includes(:account, mentions: :account).find_each do |status|
-        AccountConversation.add_status(status.account, status)
-        migrated += 1
-
+      Status.unscoped.local.where(visibility: :direct).includes(:account, mentions: :account).find_in_batches do |statuses|
+        statuses.each do |status|
+          AccountConversation.add_status(status.account, status)
+        end
+
+        migrated += statuses.length
         puts "Migrated #{migrated} rows"
       end
 
       puts
-      Notification.joins(mention: :status).where(activity_type: 'Mention', statuses: { visibility: :direct }).includes(:account, mention: { status: [:account, mentions: :account] }).find_each do |notification|
-        AccountConversation.add_status(notification.account, notification.target_status)
-        migrated += 1
-
+      Notification.joins(mention: :status).where(activity_type: 'Mention', statuses: { visibility: :direct }).includes(:account, mention: { status: [:account, mentions: :account] }).find_in_batches do |notifications|
+        notifications.each do |notification|
+          AccountConversation.add_status(notification.account, notification.target_status)
+        end
+
+        migrated += notifications.length
         puts "Migrated #{migrated} rows"
       end  
     end