fxn

Ruby: The future of frozen string literals

What is a literal?

In programming languages, literals are textual representations of values in the source code. This is a syntactical concept.

Some examples:

7 # integer literal

fractaledmind

users_file = Rails.root.join('storage', 'users.yml.erb')
if File.exist? users_file
  users = YAML.load(ERB.new(File.read(users_file)).result)

  User.insert_all(
    users.map { |user| user.except("password") },
    unique_by: :username
  )
end

fractaledmind

ass ApplicationController < ActionController::Base
  before_action :authenticate!

  helper_method :current_user
  helper_method :user_signed_in?

  private

    def authenticate
      @current_user = nil

owaiswiz

# Unnecessary indexes slows down writes and consumes additional storage and memory.

# Just paste this snippet in your Rails console (bundle exec rails c).
# And it will print all redundant indexes that are already covered by another index on the table:
#   Table `pages`:  index `site_idx` (site_id) already covered by `site_slug_idx`   (site_id,slug)
#   Table `optins`: index `list_idx` (list_id) already covered by `list_active_idx` (list_id,active)


ActiveRecord::Base.connection.tables.map do |table|
  indexes = ActiveRecord::Base.connection.indexes(table).select(&:valid).reject(&:where) 

hschne

 frozen_string_literal: true

# A leaky bucket rate limiter for Ruby
#
# @see https://www.mikeperham.com/2020/11/09/the-leaky-bucket-rate-limiter/
# @see https://en.wikipedia.org/wiki/Leaky_bucket
class RateLimit
  class Error < StandardError
    attr_accessor :retry_in

markedmondson

module SessionHelper
  extend ActiveSupport::Concern

  class ::SessionsBypassController < ActionController::Base
    def show
      session[:user_id] = params[:user_id]
      session[:team_id] = params[:team_id]
      session[:tenant] = Apartment::Tenant.current

VeerpalBrar

require 'digest'

class ConsistentHashing
  def initialize(nodes)
    nodes.map { |node| add_node(node) }
  end

  def find_cache(key)
    puts
    hash = hash_value(key)

Envek

# spec/system/support/login_helpers.rb
# See this blog post for setup guide: https://evilmartians.com/chronicles/system-of-a-test-setting-up-end-to-end-rails-testing

module LoginHelpers
  def login_as(user)
    # Craft session cookie to make request authenticated (to pass even routing constraints)
    # Compilation of these:
    #  - https://dev.to/nejremeslnici/migrating-selenium-system-tests-to-cuprite-42ah#faster-signin-in-tests
    #  - https://turriate.com/articles/2011/feb/how-to-generate-signed-rails-session-cookie
    #  - https://github.com/rails/rails/blob/43e29f0f5d54294ed61c31ddecdf76c2e1a474f7/actionpack/test/dispatch/cookies_test.rb#L350

DmitryTsepelev

How to run examples

1. Run $ createdb uniq-db-test to create DB
2. Run example with Ruby (e.g., $ ruby 1_find_or_create_by_single_thread.rb)

Benchmark output

With many successful INSERTs

Warming up --------------------------------------

reshleman

# frozen_string_literal: true

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  # Activate the gem you are reporting the issue against.