Upgrading from Ruby 1.8.7 to 2.1.2 took me an hour for a medium-sized application. It involved hardly any changes except

removing the occasional monkey patch where I had backported functionality from modern Rubies
Migrating from require to require_relative where I loaded RSpec factories in Cucumber's env.rb (the Rails application root is no longer in the load path by default)
replacing the old debugger with byebug
removing sytem_timer from Gemfile (see this SO thread Show archive.org snapshot for details)
If you get LoadError: cannot load such file -- iconv: Add gem 'iconv' to your Gemfile. iconv is a part of Ruby that was removed in 2.0. Rails 3 seems to depend on it.

All the pain with magic # encoding: utf-8 comments is gone since UTF-8 is a default encoding in Ruby 2+.

Henning Koch

makandra.com

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Last edit

Over 9 years ago

Dominik Schöler

License

Source code in this card is licensed under the MIT License.

Async control flow in JavaScript: Promises, Microtasks, async/await

Slides for Henning's talk on Sep 21st 2017.

Understanding sync vs. async control flow

Talking to synchronous (or "blocking") API

print('script start')
html = get('/foo')
print(html)
print('s...

Delivering Carrierwave attachments to authorized users only

Preparation

To attach files to your records, you will need a new database column representing the filename of the file. To do this, add a new migration (rails g migration <name>) with the following content:

class AddAttachmentToNotes...

Posted by Henning Koch to makandra dev (2014-11-19 07:44)

Upgrading a Rails 3.2 application to Ruby 2.1 is really easy

Related cards:

Understanding sync vs. async control flow

Talking to synchronous (or "blocking") API

Summary

Preparation

Introduction