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@obfusk
obfusk / break.py
Last active March 20, 2024 23:09
python "breakpoint" (more or less equivalent to ruby's binding.pry); for a proper debugger, use https://docs.python.org/3/library/pdb.html
import code; code.interact(local=dict(globals(), **locals()))
@apneadiving
apneadiving / before.rb
Last active August 29, 2015 14:07
The before is some standard code, `with_waterfall` presents another way to write it (fully chainable)
# In controller
result = TaxCalculator.new(order).call
if result[:success]
render json: { value: result[:value] }
else
render json: { errors: result[:errors] }, status: 422
end
# The service
class TaxCalculator
@dhoelzgen
dhoelzgen / base_controller.rb
Last active October 7, 2021 16:19
CORS in Rails 4 APIs
class API::V1::BaseController < ApplicationController
skip_before_filter :verify_authenticity_token
before_filter :cors_preflight_check
after_filter :cors_set_access_control_headers
def cors_set_access_control_headers
headers['Access-Control-Allow-Origin'] = '*'
headers['Access-Control-Allow-Methods'] = 'POST, GET, PUT, DELETE, OPTIONS'
@Integralist
Integralist / Ruby Lambdas.md
Last active August 8, 2023 05:10
Ruby lambdas

Lambda: standard

# Creating a lambda
l = lambda { |name| "Hi #{name}!" }

# Executing the lambda
l.call("foo") # => Hi foo!
@lfender6445
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 config.ru)
  • pry -r ./config/environment.rb - load your rails into a pry session

Debugger

@mikaelbr
mikaelbr / destructuring.js
Last active April 25, 2024 13:21
Complete collection of JavaScript destructuring. Runnable demos and slides about the same topic: http://git.mikaelb.net/presentations/bartjs/destructuring
// === Arrays
var [a, b] = [1, 2];
console.log(a, b);
//=> 1 2
// Use from functions, only select from pattern
var foo = () => [1, 2, 3];
@mattiaslundberg
mattiaslundberg / arch-linux-install
Last active March 29, 2024 08:38
Minimal instructions for installing arch linux on an UEFI system with full system encryption using dm-crypt and luks
# Install ARCH Linux with encrypted file-system and UEFI
# The official installation guide (https://wiki.archlinux.org/index.php/Installation_Guide) contains a more verbose description.
# Download the archiso image from https://www.archlinux.org/
# Copy to a usb-drive
dd if=archlinux.img of=/dev/sdX bs=16M && sync # on linux
# Boot from the usb. If the usb fails to boot, make sure that secure boot is disabled in the BIOS configuration.
# Set swedish keymap
@chanks
chanks / gist:7585810
Last active February 29, 2024 03:50
Turning PostgreSQL into a queue serving 10,000 jobs per second

Turning PostgreSQL into a queue serving 10,000 jobs per second

RDBMS-based job queues have been criticized recently for being unable to handle heavy loads. And they deserve it, to some extent, because the queries used to safely lock a job have been pretty hairy. SELECT FOR UPDATE followed by an UPDATE works fine at first, but then you add more workers, and each is trying to SELECT FOR UPDATE the same row (and maybe throwing NOWAIT in there, then catching the errors and retrying), and things slow down.

On top of that, they have to actually update the row to mark it as locked, so the rest of your workers are sitting there waiting while one of them propagates its lock to disk (and the disks of however many servers you're replicating to). QueueClassic got some mileage out of the novel idea of randomly picking a row near the front of the queue to lock, but I can't still seem to get more than an an extra few hundred jobs per second out of it under heavy load.

So, many developers have started going straight t

@kenrett
kenrett / Selenium Cheat Sheet.md
Last active May 25, 2023 01:28
Selenium Cheat Sheet - Ruby

#Getting Started

##Webpage:

<html>
<head>
    <title>Testing with Ruby and Selenium WebDriver</title>
</head>
 
<body bgcolor="antiquewhite">
@daluzluiz
daluzluiz / new.html.erb
Created December 16, 2012 17:13
<h2>Sign up</h2>
<div id="stripe_error" class="alert alert-error" style="display:none" >
</div>
<%= simple_form_for(resource, :as => resource_name, :url => registration_path(resource_name), :html => {:class => 'card_form form-vertical' }) do |f| %>
<h3><%= params[:plan].titleize if params[:plan] %> Subscription Plan</h3>
<%= hidden_field_tag 'plan', params[:plan] %>
<%= f.error_notification %>
<%= f.input :f_name, :autofocus => true %>
<%= f.input :l_name %>
<%= f.input :email, :required => true %>