ProGM

Arel Cheatsheet on Steroids

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

Tables

posts = Arel::Table.new(:posts)
posts = Post.arel_table # ActiveRecord

Table alias

FSX

-- The goal of this script is to trim messages that have been processed by
-- all extant groups from the a given Redis stream. It returns the number
-- of messages that were deleted from the stream, if any. I make no
-- guarantees about its performance, particularly if the stream is large
-- and not fully processed (so a simple XTRIM isn't possible).

-- First off, bail out early if the stream doesn't exist.
if redis.call("EXISTS", KEYS[1]) == 0 then
  return false
end

jalkoby

## Context + metadata
shared_context 'Logged as a user', role: true do
  let(:user) { |example| create :user, example.metadata[:role] }
  before { login_as user }
end

scenario "Login as a client", role: :client
scenario "Login as a customer", role: :customer
scenario "Login as an admin", role: :admin

andyyou

Rails 5.2 with webpacker, bootstrap, stimulus starter

This gist will collects all issues we solved with Rails 5.2 and Webpacker

Create Project

# Last few parameters(--skip-* part) is only my habbit not actully required
$ rails new <project_name> --webpack=stimulus --database=postgresql --skip-coffee --skip-test

random-robbie

wget https://storage.googleapis.com/golang/go1.10.1.linux-armv6l.tar.gz
sudo tar -C /usr/local -xvf go1.10.1.linux-armv6l.tar.gz
cat >> ~/.bashrc << 'EOF'
export GOPATH=$HOME/go
export PATH=/usr/local/go/bin:$PATH:$GOPATH/bin
EOF
source ~/.bashrc

mihai-ciupina

defmodule MyApp.Auth do
  import Comeonin.Bcrypt, only: [checkpw: 2, dummy_checkpw: 0]

  alias MyApp.Accounts.User
  alias MyApp.Repo

  def login(conn, user) do
    conn
    |> Guardian.Plug.sign_in(user)
  end

sasa1977

# http://adventofcode.com/2017/day/1

defmodule Day1 do
  def sum1(digits), do:
    digits
    |> Stream.concat(Enum.take(digits, 1))
    |> Stream.chunk_every(2, 1, :discard)
    |> Stream.filter(&match?([el, el], &1))
    |> Stream.map(&hd(&1))
    |> Enum.sum()

kirankarki

1. Change rails version in Gemfile
> gem 'rails', '~> 5.1', '>= 5.1.4'

2. Remove Gemfile.lock
> git rm Gemfile.lock

3. Run bundle install command
> bundle install --jobs=5

4. Run rails' app update to apply changes to app

deadprogram

// how to run:
// go run mqtt.go tcp://iot.eclipse.org:1883 /topic/name
package main

import (
	"os"

	mqtt "github.com/eclipse/paho.mqtt.golang"
	"github.com/gizak/termui"
)

thisduck

# config/initializer/delayed_job.rb

module Delayed
  module Plugins
    class Flaming < Plugin
      callbacks do |lifecycle|
        lifecycle.around(:invoke_job) do |job, *args, &block|
          HelperMethods.flaming(name: "DELAYEDJOB--#{job.name}") do
            block.call(job, *args)
          end