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Fixes. #1716
cf. #1704 (cf. #1577 )
lib/tasks/fetch_news.rake
解決すべき問題
fetch_news.rake
→ 差分がある場合のみ更新するように修正↪︎
title
またはpublished_at
に差分がある場合だけupdated_items
に追加import_news.rake
→ 更新があった場合のみsave!
↪︎
news.changed?
で変更があるか判定。新規 or 変更時だけ保存(既存データはそのまま)。
(ログに新規/更新のステータスも出力)