Ruby on Rails 5.1.4 RC1 and 5.0.6.RC1 released

Updates for two version of Ruby on Rails framework available now 
28 August 2017   1893

Good news for Ruby on Rails coders. New 5.1.4 release candidate 1st version and 5.0.6 release candidate 1st version has been released. Final release is p


Let's check what's new for every version.

Rails 5.0.6.rc1

  • Active Record
    • Ensure sum honors distinct on has_many :through associations


Feel free to use this checksum in order to check version of your gem.

$ shasum -a 256 *-5.0.6.rc1.gem
0490ac6c4621756871839ad584f0a0349a72a9ccdeac0f72dafd3539638ba5ef  actioncable-5.0.6.rc1.gem
fc7697724d884307bf2ea307c028902f71f96304b9a882418e6ec94d10202cd9  actionmailer-5.0.6.rc1.gem
b0f1f4479f61ada80b3dbe3e9ccaa0db390119918e5da632dda3c8398e6e4f5f  actionpack-5.0.6.rc1.gem
673d06523edf733163ad668fe3cd64bd1c7fb97244c952241d1e00ee6835101b  actionview-5.0.6.rc1.gem
ac6521d4df459db19fc0f2740d0e0c0a6f3102252c8124ecb25e8d33335d6cf4  activejob-5.0.6.rc1.gem
0824cd58f175a3c825dce9d42d73254d25af25d824ae1c5c3465f12bb0812f72  activemodel-5.0.6.rc1.gem
7972a8a76c711b8fc01ab52d95c4f16a73e9683e4d745a17d61ab91051df856c  activerecord-5.0.6.rc1.gem
40f0c77de7e54b6a3581272ce5b6409ae0c61b5bfad3239db46807d8342ce8a3  activesupport-5.0.6.rc1.gem
7873311d5340bffbabeb33cb9d3ce2c97056bc2bebad3abfcba6f5b38b209075  rails-5.0.6.rc1.gem
3fd4b347f19fb4ff2ec7cee4c9a45aba31d1e287583943269bc9d09bef61ca93  railties-5.0.6.rc1.gem

See GitHub for additional information.  

Rails 5.1.4.rc1 

  • Active Record

    • Ensure sum honors distinct on has_many :through associations

    • Fix COUNT(DISTINCT ...) with ORDER BY and LIMIT to keep the existing select list.

    • Fix unscoped(where: [columns]) removing the wrong bind values

      When the where is called on a relation after a or, unscoping the column of that later where, it removed bind values used by the or instead.

      Post.where(id: 1).or(Post.where(id: 2)).where(foo: 3).unscope(where: :foo).to_sql
      # Currently:
      #     SELECT "posts".* FROM "posts" WHERE ("posts"."id" = 2 OR "posts"."id" = 3)
      # With fix:
      #     SELECT "posts".* FROM "posts" WHERE ("posts"."id" = 1 OR "posts"."id" = 2)
    • When a has_one association is destroyed by dependent: destroydestroyed_by_association will now be set to the reflection, matching the behaviour of has_many associations.

  • Railities

    • Allow irb options to be passed from rails console command.


You can use this checksum to check version of your gem.

$ shasum -a 256 *-5.1.4.rc1.gem
6ebb05e31a5d46379f638092742aa1543ab3522302a62351de9e5dc746fc7c77  actioncable-5.1.4.rc1.gem
fb3e3743a29a70524c64caa656056f7cf0085998a1438b28325c6e10a6330efd  actionmailer-5.1.4.rc1.gem
c4b39e9b721a4b2eb37be9f18bfbc0a479b61ae4d6b536b1b9f2fc06f83f6ad8  actionpack-5.1.4.rc1.gem
9930cccacbe71085b894ca0410da07625b801c4db1775b655357bd2bf5824ae9  actionview-5.1.4.rc1.gem
e0c7610f4fe20c778e5f9739f80ae4d5d3450bbacff49d24064b0b3b048f9dd6  activejob-5.1.4.rc1.gem
11dae082bd1dfea9541a60501135bef6c32d792407dea57250dc95ba5e415a77  activemodel-5.1.4.rc1.gem
3b058a80c8f14c324dad4c185825a4ce4c4f853af37002bec92e179bef583fcb  activerecord-5.1.4.rc1.gem
c9984249c0200e9c1f462779294e0cec6bb6c8b95421dc01b579a0efa2db6561  activesupport-5.1.4.rc1.gem
c8134e1efcc5f17ac28927a76423146f3a7baf618d97a5d752d09edf4c5eeb7c  rails-5.1.4.rc1.gem
7589a79f6b4a4de73d2d427193eb9beacd1628530958dd4d8f9404531748a973  railties-5.1.4.rc1.gem

Learn more at GitHub.

If you will face any issue, developers ask you to create an issue and mention @eileencodes.

Charles Nutter. How to move your Ruby project to JRuby and why

Charles Nutter works on JRuby and JVM language support at Red Hat.
03 October 2018   1196

— How did you get into programming and into Ruby world?

— In 2004, I was working at a government contracting firm as a Java Enterprise Architect. I was in charge of a large mainframe conversion for the United States Department of Agriculture, which meant I spent a couple weeks a month in the Washington D.C. area. One of those trips coincided with RubyConf 2004, and since a close friend had been recommending I look at Ruby, I decided to attend. So there I was sitting in a Ruby conference without ever having learned Ruby...and I understood every piece of code, every example. I was amazed and vowed to find a way to bring Ruby into my Java world.

— Which projects are you working on now?

— My primary role is as co-lead of JRuby. This also means supporting several side projects like our native-library backend (Ruby's FFI library is maintained by us using this backend on JRuby) and our String encoding subsystem (an elaborate port of the logic from CRuby). I also do much of the outreach to the community and try to make sure our users are getting their issues addressed. There's always plenty to work on!

— Which one would have the biggest general impact from you opinion?

— I like to think that JRuby, while not the most popular JVM language, has at least helped to change the JVM platform. Because of our collaborations with Sun Microsystems, Oracle, and others, we have solid dynamic language support at the JVM level along with many other projects to support alternative languages. The JVM today is a much more hospitable home for non-Java languages than it used to be, and I hope we've played some small part in that change.

— Which languages are you writing on in your everyday life? Which one do you like most? Why?

— Most days I write in a mix of Ruby and Java, since JRuby is implemented using both. I like both languages for different tasks. Ruby is a better language for building applications that need to evolve and adapt quickly. Java is a great language for writing high-speed, reliable libraries and services. JRuby gives you the best of both worlds!

— Do you like to program in Java?

— I do, especially with all the language improvements that have been added recently, like lambdas (closures or blocks in Ruby) and the new "var" syntax for declaring local variables when the static type is unambiguous.

— What do you think about Rust?

— Rust is a great language! I did a lot of C++ development in my college years, and I can tell you right now if I'd had Rust available then I would have used it. I'm especially jealous of the static-typed ownership model, which helps avoid thread-safety issues like races and data corruption. I hope to see other languages adopt this pattern in the future.

— What do you think about the Ruby language perspective? Is it or its community dying?

— After all these years working on JRuby, I do still love Ruby syntax and the Ruby way of doing things. However I worry that the language is held back too much by limitations of its primary runtime. JRuby has been fighting to make true parallel threading a reality for Ruby developers, but still today the vast majority of Ruby services are run using multiple isolated processes, wasting tremendous amounts of CPU and memory resources. I believe this is due to the C API for writing Ruby extensions being so large and so prevents many improvements -- including parallel threading -- from being developed. Hopefully we'll see this change some day.

— Which upcoming or not well-known features of Ruby language would rush in future?

— I look forward to strings becoming immutable-by-default, as they are in most other languages. Parallel programming would be much simpler if more of Ruby's objects supported pure-immutable or "deep freeze" semantics. It's a bit like the Rust ownership model...if you're going to be sharing an object across threads, choose the version of that object that you know can't be modified anymore. This extends to arrays, hashes, and just about every other mutable object in Ruby: we need to make it easier to lock down mutable data.

— Could you give me an advice on how to move my ancient monolithic project to JRuby? And should I?

— The first question really is whether such a move would benefit you. There's many good reasons to consider a move to JRuby:

  • Reducing CPU  and memory costs in a shared hosting environment by utilizing JRuby's true parallel threading
  • Deploying a Ruby application into a JVM-heavy environment, such as used by larger financial or government organizations
  • Needing access to libraries that only exist on the JVM, or that are more portable or scalable on the JVM than their Ruby or C equivalents
  • Getting a little performance boost out of CPU-heavy or concurrency-heavy applications.

— I would say if your application is scaling well and not costing you too much today, perhaps you don't need to make a move. But if you decide you need more out of Ruby, here's the process for migrating:

  • Do a clean bundle of your application, paying special attention to C extensions you may be using. You can also do this bundling *on* JRuby, and then deal with missing or unsupported libraries one by one.
  • For each extension, search for a JRuby equivalent. We have some pages on the JRuby wiki to help with this. Most popular libraries have JRuby versions. If no JRuby version exists, you may look for a pure-Ruby version (it might be fast enough on JRuby) or a JVM library (in Java or Scala or Clojure or whatever) that could be used as a replacement.
  • Once your bundle completes, you should have a working JRuby application! We've worked very hard on compatibility, and try to be responsive if users find new issues, but a successfully-bundled application is expected to work.

The steps beyond this involve deciding how to take advantage of your newfound power: how many threads to throw at a given server, what you're going to do with all the money you're saving, etc.

— What should nowadays students learn to become good programmers?

— When I was at university, my earliest computer science courses used the Scheme language, a Lisp-like functional language that's great for teaching the fundamentals of programming. I still recommend that serious new programmers work through at least some of the Structure and Interpretation of Computer Programs book from MIT. Beyond that, I'd say learn as many different and unusual languages as you can; they'll all give you new ideas and new ways to look at programming problems.

— How do you keep yourself motivated for programming? Have you ever been "burned-out"?

— Burn-out is a real problem in our industry, and working in open source brings with it huge amount of stress. We've all felt that way sometimes...too much work to do and not enough time to do it, missing out on time with family and friends, ignoring our own health so we can fix one more bug. These days I try to center myself by keeping up with hobbies: playing video and board games, learning to play guitar, studying foreign languages, and traveling around the world to meet new friends. There's always this nagging workaholic telling me to get back on the job, but I'm learning how to maintain the right balance.

— What do you think about Russia and what do you expect of the upcoming RubyRussia event?

— I love Russia, and my speaking trips the past few years have been some of the most rewarding of my life. This will be my fourth visit, having been to Saint-Petersburg, Moscow, and Novosibirsk (!!!) previously. I'm looking forward to returning to Moscow and meeting the RubyRussia community I've heard so much about!

Questions by Dmitry Matveyev PM at Evrone