Only temporary and easy to remove. It would be tricky if entire classes/objects/abstractions were missing entirely. This would require essentially reimplementin

Only temporary and easy to remove. It would be tricky if entire classes/objects/abstractions were missing entirely. This would require essentially reimplementing that part of the code. For other Rails version changes, for instance, the removal of RJS as a default component in rails 3.1 could require that you re-architect certain user flows or pages in your app.