harssh

Note: As of Ruby 3.0.0, Hash#except is now [part][1] of the language. However, Ruby does not implement Hash#except!.

Sometimes I want to remove a specific key-value pair from a Ruby hash and get the resulting hash back. If you're using Rails or ActiveSupport you can accomplish this using Hash#except:

hash = { a: 1, b: 2, c: 3 }
hash.except(:a)     # => { b: 2, c: 3 }

# note, the original hash is not modified
hash # => { a: 1, b: 2, c: 3 }

harssh

require 'parallel'
require 'rtesseract'
require 'mini_magick'

source = "/MyDirectory/my.pdf"
doc = {}
pdf = MiniMagick::Image.open(source)
Parallel.map(pdf.pages.each_with_index, in_threads: 8) do |page, idx|
  tmpfile = Tempfile.new(['', '.tif'])
  MiniMagick::Tool::Convert.new do |convert|

harssh

class UserObserver < Mongoid::Observer

  def after_save(record)
    expire_cache(record)
  end

  private
  def expire_cache(record)
    Rails.cache.delete("user:#{record.id}")
  end

harssh

namespace :clean_code do
  # rubcop only available in dev
  if Rails.env.development?
    require 'rubocop/rake_task'
    def diff_files
      cmd = %q( git diff --name-only --diff-filter=ACMRTUXB \
      $(git merge-base HEAD origin/master) \
      | egrep '\.rake$|\.rb$' )
      diff = `#{cmd}`
      diff.split("\n")

harssh

git --no-pager diff --name-only develop | tr '\n' ',' | sed 's/\(.*\),/\1 /'

harssh

Model
  .where(
    "EXTRACT(dow FROM log_in) IN (1,2,3,4,5)"
  )
  .where(
    "log_in::time BETWEEN '9:00' AND '18:00'"
  )
  .where(
    "log_in BETWEEN now()::timestamp - (interval '1 week' AND now()::timestamp)"
  )

harssh

# app/models/experience.rb
#
# == Schema Information
#
# Table name: experiences
#
#  id               :integer          not null, primary key
#  title            :string
#  description      :text
#  created_at       :datetime         not null

harssh

• Read the PR description
• Read through all the changes, considering the following questions.
  • Is there anything you can praise about this PR? Start with praise.
  • Are variable names brief but descriptive?
  • Are new/changed functions no longer than a paragraph?
  • Do all function parameters have default values where appropriate?
  • Is the code clear and clean? (see Robert C. Martin's Clean Code)
  • Is there enough documentation?
• Does the programming style meet the requirements of the repository (PEP8 for python, google for c++, etc.)

harssh

#!/usr/bin/env ruby

require 'fileutils'

files = Dir["*/*.PDF"].collect{|f| File.expand_path(f)}

files.each_with_index do |file, index|
  puts "copying file #{index}"
  FileUtils.cp file, "pdf/#{index}.pdf"
end

harssh

Test Dropzone.js File Uploads With Capybara
Dec 29, 2014

Integration tests involving complex JS interactions are a pain, especially with something like drag and drop file uploads (you can’t exactly drag something into a headless browser). My recent use case was an AngularJS application using Dropzone.js with Ruby on Rails on the backend, so I needed a way to make Dropzone play nicely with Capybara Webkit. Here is the spec helper I ended up with:

def drop_in_dropzone(file_path)
  # Generate a fake input selector
  page.execute_script <<-JS
    fakeFileInput = window.$('<input/>').attr(
      {id: 'fakeFileInput', type:'file'}