--- title: "#347: Crystal from a Rubyist's Perspective, and Improving Capistrano Deployment Performance" publication: "Ruby Weekly" issue: 347 published_at: "2017-05-04" canonical_url: "https://rubyweekly.com/issues/347" --- #347: Crystal from a Rubyist's Perspective, and Improving Capistrano Deployment Performance This week's Ruby and Rails news[Read this e-mail on the Web](http://rubyweekly.com/issues/347) Ruby WeeklyIssue 347 — May 4, 2017 David Heinemeier Hansson[Programming with a Love of the Implicit](https://m.signalvnoise.com/programming-with-a-love-of-the-implicit-66629bb81ee7)DHH challenges the idea the explicit code is always better, citing the trade-offs from implicit code: _“I embrace implicit code. I embrace the context. I swoon over magic.”_ Daniel P. Clark[Crystal from a Rubyist's Perspective](https://blog.codeship.com/crystal-from-a-rubyists-perspective/)[Crystal](https://crystal-lang.org/) is a fast, compiled, Ruby-like language. This post takes a quick look at its syntax followed by a dive into Kemal, a Sinatra-like webapp library. ReinteractiveSponsored[We’ve solved the problems of traditional Ops](https://reinteractive.com/enquiries/new?code=ops_care&sid=119)Our out-source DevOps solves the problems associated with ROR development. Plus our blue/green pre-baked deployment process means that you can deploy your app as often as you want. Get started today – start enjoying OpsCare®. [![Reinteractive\](https://copm.s3.amazonaws.com/2cc5f895.jpg)](https://reinteractive.com/enquiries/new?code=ops_care&sid=119) Seth Ringling and Justin Weiss[Improving Capistrano Deployment Performance](https://engineering.avvo.com/articles/capistrano-deploy-perf.html)[capistrano-measure](https://github.com/AMekss/capistrano-measure) is a tool for measuring the speed of each part of your deployment process. Richard Schneeman[The Fastest Way to Generate A Heap Dump on Heroku](https://www.schneems.com/2017/05/01/the-fastest-way-to-generate-a-heap-dump-on-heroku/)[Heroku exec](https://devcenter.heroku.com/articles/heroku-exec) makes it possible to SSH into a live-running Heroku app instance, which opens up some new debugging approaches. Rodrigo Rosenfeld Rosas[Rails: The Good and Bad Parts](https://rosenfeld.herokuapp.com/en/articles/ruby-rails/2017-05-03-ruby-on-rails-the-bad-and-good-parts)One developer’s thoughts on the good, bad, and unused bits of Rails and why he prefers other frameworks, as covered [in this look at _Roda_](http://rosenfeld.herokuapp.com/en/articles/ruby-rails/2017-05-01-feeling-alone-in-the-ruby-community-and-replacing-rails-with-roda). Citus Data[6 Postgres Tips for Rails Developers](https://www.citusdata.com/blog/2017/04/28/postgres-tips-for-rails/)A recap of the best Rails-related PostgreSQL tips that Citus shared at RailsConf. Dmitry Rocha[Benchmarking Crystal vs Ruby](https://blog.codeminer42.com/crystal-by-numbers-8a675b0572fc)Comparing three APIs written in Kemal (Crystal), Rails, and Sinatra. Jobs - [Ruby Developer at BBC News](http://careerssearch.bbc.co.uk/jobs/job/Software-Engineer-Frameworks-Tools-BBC-News-WS2020/19336?utm_source=rubyweekly&utm_medium=email)We’re hiring a Rubyist with strong interest in development tooling and deployment automation. We design AWS infrastructure solutions, writing high quality, scalable code used by millions of users a day. BBC - [Senior Ruby Developer](http://careers.unbounce.com/software-developer-customer-portal/?utm_source=rubyweekly&utm_medium=email)If you are a Ruby on Rails developer who loves tackling atypical Rails challenges, ask us about ours - we are happy to tell you more. 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Bright Funds In brief - [RubyGems 2.6.12 Released](http://blog.rubygems.org/2017/04/30/2.6.12-released.html?utm_source=rubyweekly&utm_medium=email) news RubyGems - [Goruco 2017: A 1 Day Ruby-Flavored Conf in NYC on June 24](http://goruco.com/?utm_source=rubyweekly&utm_medium=email) news Sells out every year and has a lot of great speakers. - [An Intro to Practical Machine Learning in Ruby](https://www.youtube.com/watch?v=Zl17mtp1adM) video Jordan Hudgens - [Some Lesser-Known Features in Rails 5.1](http://www.justinweiss.com/articles/the-lesser-known-features-in-rails-5-dot-1/?utm_source=rubyweekly&utm_medium=email) tutorial Hasta la vista, `alias_method_chain`… Justin Weiss - [Crafting Better Code Reviews](https://medium.com/@vaidehijoshi/crafting-better-code-reviews-1a5fc00a9312?utm_source=rubyweekly&utm_medium=email) tutorial An essay adapted from a talk originally given at RailsConf 2017. Vaidehi Joshi - [Use Caution with before_destroy Callbacks](https://medium.com/appaloosa-store-engineering/caution-when-using-before-destroy-with-model-association-71600b8bfed2?utm_source=rubyweekly&utm_medium=email) tutorial The order of declarations matters. Appaloosa Store - [How to Control Flow in Ruby Blocks](https://spin.atomicobject.com/2017/04/29/ruby-blocks-control-flow/?utm_source=rubyweekly&utm_medium=email) tutorial The difference between `next` and `return` for controlling flow in blocks. Chris Farber - [Functional Object Composition and MVC](https://blog.codeminer42.com/functional-object-composition-and-mvc-d914144e923f?utm_source=rubyweekly&utm_medium=email) tutorial Could changing the standard MVC controller action by using object composition be an elixir to some MVC ills? Thiago Araújo Silva - [Autoscaling for your Heroku dynos](https://www.hirefire.io?utm_source=rubyweekly&utm_medium=email) tools Automatically scale up and down to handle increased workloads and avoid wasting money on idle resources. HireFireSponsored - [A Curated List of Ruby Machine Learning Links and Resources](https://github.com/arbox/machine-learning-with-ruby?utm_source=rubyweekly&utm_medium=email) tools Andrei Beliankou - [Factory Girl Instruments: Benchmark and Debug Factory Girl Models](https://github.com/shiroyasha/factory_girl_instruments?utm_source=rubyweekly&utm_medium=email) tools Igor Šarčević - [Rubotnik: Boilerplate to Quickly Build Facebook Messenger Bots](https://github.com/progapandist/rubotnik-boilerplate?utm_source=rubyweekly&utm_medium=email) tools Andy Barnov - [Catch Errors Before Your Users Do 💻](https://rollbar.com/rubyweekly?utm_source=rubyweekly&utm_medium=email) tools Rollbar detects and alerts you via Slack, HipChat when code breaks. 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