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migrationで安全にtableをdropする

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Last updated at Posted at 2014-12-24

開発途中だと、何らかの原因でテーブルが既に消えていて、migrationのdownに失敗することがあります。
きれいに作ることができれば、ありえないパターンですが、発生してしまいまいがちです。
回避するためにテーブルをチェックしてからdropします。

def down
  :hoge_tables.tap{ |t| drop_table t if ActiveRecord::Base.connection.table_exists?(t) }
end
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