Gemnasium is free for public repositories with a premium plan for private repositories. Upgrade the Rails gem Update the Gemfile with the newer version of Rails. Do you spend your time forking and back-porting the library to support your older code base, or do you upgrade your code base to leverage the current Ruby ecosystem? If you have a Rails 4. You can run gem list again to see the gems that were installed in the gemset. To get a list of gems that are outdated: I recently updated a Rails app from 3. If installation fails, make sure your system is configured properly look for help on Stack Overflow. Other times, these changes result in performance gains and overall reliability. Make sure your tests pass Having a good test suite makes Rails upgrades so much easier.
With a passing test suite, free of deprecation warnings, I like to run the app locally, and fire up the Rails console, and check for any other deprecation warnings in the development log. Do you spend your time forking and back-porting the library to support your older code base, or do you upgrade your code base to leverage the current Ruby ecosystem? Sometimes, these are new programming constructs to make your life as a developer easier. Before doing this, remember that this will replace many of the files in your config directory. This is especially important if SimpleCov found gaps in your test coverage. Rails provides a rails rails: New Default Initializers As of Rails 5. Check the Rails version: Wrapping up This guide covered the general guidelines to be followed for an upgrade to any version of Rails. And sometimes, your hand is forced by a dependency, or a dependency of that dependency. Your Gemfile specifies the Rails version used by your application. Keeping up with supported Ruby versions is key. If you are certain that the difference is due to a Rails version change, you can allow rails rails: Or maybe they have issues with the new Ruby version. Also pay attention to the deprecation warnings that you might come across when running the tests. Make sure you have a decent suite of tests and they are all passing before you start with the upgrade. When not to upgrade Ruby A word of advice: This will help you catch many subtle bugs that might appear as a result of the upgrade. You can run gem list again to see the gems that were installed in the gemset. There are two ways to compare differences in a simple Rails application: If it is a new gemset, and a Gemfile is present in the project directory, you can use bundle install to install the necessary gems. If you have a Rails 4. Use this method for updates between patch versions, for example from Rails 4. Patch updates seldom change the default new Rails application. If you have difficulties with new gem versions, you can switch back to the older gemset easily, without reinstalling your old gems. Most simple applications will not be affected by the changed defaults. Review the diffs Before you commit the changes, take a close look at the diffs and find out what has changed.
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