# モンキーパッチ ## 問題 [Old Rails and PostgreSQL 12 Problem](https://nrogap.medium.com/old-rails-and-postgresql-12-problem-ba44388feb1d) ## PostgreSQLAdapter ### Rails 4.2.1 https://github.com/rails/rails/blob/v4.2.1/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb#L313 ### Rails 4.2.5 https://github.com/rails/rails/blob/v4.2.5/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb#L673 ## Active Admin https://github.com/activeadmin/activeadmin/blob/v1.0.0.pre5/lib/active_admin/error.rb#L40 ## 参考 [Ruby on Rails アプリケーションにおけるモンキーパッチの当て方](https://techlife.cookpad.com/entry/a-guide-to-monkey-patchers)
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