---
title: "This week's Ruby news, issue 221"
publication: "Ruby Weekly"
issue: 221
published_at: "2014-11-13"
canonical_url: "https://rubyweekly.com/issues/221"
---

This week's Ruby news, issue 221

This week's Ruby and Rails news[Read this e-mail on the Web](http://rubyweekly.com/issues/221)

Ruby WeeklyIssue 221 — November 13, 2014

ruby-lang.org[Ruby 2.1.5, 2.0.0-p598, and 1.9.3-p551 Released Due to Another REXML Vulnerability](https://www.ruby-lang.org/en/news/2014/11/13/ruby-2-1-5-is-released/)All include a security fix for [CVE-2014-8090](https://www.ruby-lang.org/en/news/2014/11/13/rexml-dos-cve-2014-8090/), another XML expansion based DoS vulnerability found in REXML.


Justin Weiss[Fun with the Object#method Method](http://www.justinweiss.com/blog/2014/11/10/fun-with-the-method-method/)Have you ever wanted to pass a method to a function that only takes a block? Or figure out which of your object’s superclasses broke the method you’re trying to call?


Ben Lewis[Building A Ruby List Comprehension](https://blog.engineyard.com/2014/ruby-list-comprehension)Ben Lewis decided to try and implement a Python style list comprehension mechanism in Ruby. Here he explains some things he learnt along the way.


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Adam Cooke[Ruby DSLs for Fun and Profit](http://blog.atechmedia.com/ruby-dsls-for-fun/)A walkthrough of creating a simple internal DSL for defining a basic address book.


PJ Hagerty[So You've Decided to Contribute to Ruby](https://blog.engineyard.com/2014/contribute-to-ruby)A look at some of the ways you can get involved with contributing directly to MRI. (To add my own advice, spend time [exploring the MRI code base](https://www.youtube.com/watch?v=0npv906IQag) first.)


In brief

Curated by [Peter Cooper](https://twitter.com/peterc) and [Glenn Goodrich](https://twitter.com/ruprict), and published by [Cooperpress](https://cooperpress.com/).
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