Posts about ruby

Choosing a Ruby gem

25 July 2017
Instead of writing yet another list of gems you should be using, i'll try to explain how i choose a gem for a particular task or function. This is by no means a complete checklist, it's just my typical way of going about things.


If you're a Ruby developer you are probably familiar with the website It's "the" repository for all information about Ruby gems.

Things i find important when looking for a gem:

Number of...

OCR using the open Google Cloud Vision API

22 February 2016
Just create a new api key in the developer console, replace it in the code below and it should work. Then you can call "whatever_you_call_the_file.rb /Downloads/some_image_with_text.jpg" and google will OCR-it and the script will print out the recognized text.
require "base64"
require 'net/http'
require 'json'

# Base 64 the input image
b64_data = Base64.encode64([0], "rb").read)

# Stuff we need
api_key = ""
content_type = "Content-Type: application/json"
url = "https://vision.g...

Problem starting Sidekiq in development

26 May 2015

If you ever get this error:

can't link outside actor context

Followed by something like:

    /Library/Ruby/Gems/2.0.0/gems/celluloid-0.16.0/lib/celluloid.rb:176:in `new_link'
    /Library/Ruby/Gems/2.0.0/gems/sidekiq-3.3.4/lib/sidekiq/launcher.rb:21:in `initialize'
    /Library/Ruby/Gems/2.0.0/gems/sidekiq-3.3.4/lib/sidekiq/cli.rb:81:in `new'
    /Library/Ruby/Gems/2.0.0/gems/sidekiq-3.3.4/lib/sidekiq/cli.rb:81:in `run'
    /Library/Ruby/Gems/2.0.0/gems/sidekiq-3.3.4/bin/sidekiq:8:in `'
Displaying posts 4 - 6 of 12 in total