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leastbad / channel.rb
Last active July 24, 2022 11:10
Action Cable Channels setup
module ApplicationCable
class Channel < ActionCable::Channel::Base
include CableReady::Broadcaster
delegate :render, to: :ApplicationController
ProGM /
Last active April 19, 2024 04:06
Arel cheatsheet on Steroids

Arel Cheatsheet on Steroids

A (more) complete cheatsheet for Arel, including NamedFunction functions, raw SQL and window functions.


posts =
posts = Post.arel_table # ActiveRecord

Table alias

ntamvl /
Last active February 16, 2024 19:13
How to create a Ruby gem that adds Rake tasks

How to create a Ruby gem that adds Rake tasks

Create a gem

One way to do this is to use bundler to scaffold our gem:

bundler gem my_gem

Add rake tasks to our gem

I prefer to put tasks meant to manage the gem itself in lib/tasks, and tasks the gem is meant to provide to gem users in lib/my_gem/tasks.

lfender6445 / gist:9919357
Last active March 28, 2024 08:38
Pry Cheat Sheet

Pry Cheat Sheet

Command Line

  • pry -r ./config/app_init_file.rb - load your app into a pry session (look at the file loaded by
  • pry -r ./config/environment.rb - load your rails into a pry session


markbates / gist:4240848
Created December 8, 2012 16:06
Getting Started with Rack

If you're writing web applications with Ruby there comes a time when you might need something a lot simpler, or even faster, than Ruby on Rails or the Sinatra micro-framework. Enter Rack.

Rack describes itself as follows:

Rack provides a minimal interface between webservers supporting Ruby and Ruby frameworks.

Before Rack came along Ruby web frameworks all implemented their own interfaces, which made it incredibly difficult to write web servers for them, or to share code between two different frameworks. Now almost all Ruby web frameworks implement Rack, including Rails and Sinatra, meaning that these applications can now behave in a similar fashion to one another.

At it's core Rack provides a great set of tools to allow you to build the most simple web application or interface you can. Rack applications can be written in a single line of code. But we're getting ahead of ourselves a bit.