Fix to change column type with PostgreSQL in production #178
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#12 (comment)
postgresql (in production) でmigrationを流すとカラムの型変更時に落ちる。
postgresqlの仕様のようで、タイプキャストを明示的に実行してやる必要がある模様。
cf: https://makandracards.com/makandra/18691-postgresql-vs-rails-migration-how-to-change-columns-from-string-to-integer
ということで、migrationファイル内で
connection.adapter_name
をチェックして、postgresqlの時はタイプキャストするように修正しました。