manga2pdf VS Ruby on Rails

# From: https://github.com/PinGunter/manga2pdf require 'selenium-webdriver' require 'uri' require 'ruby-progressbar' require 'rmagick' require 'glimmer-dsl-libui' module Manga2PDF class MangaIMG def initialize(url, mkdir, ch_limit, savefile) @url = url @end_state = false @global_count = 0 @opts = Selenium::WebDriver::Firefox::Options.new(args: ['-headless']) @driver = Selenium::WebDriver.for(:firefox, capabilities: @opts) @driver.get @url @mkdir = mkdir @current_title = @driver.find_element(tag_name: 'h1').text @ch_limit = ch_limit @img_list = [] @savefile = check_savefile savefile end def check_savefile(savefile) if savefile[savefile.length-4, savefile.length] != ".pdf" return (savefile + ".pdf") end savefile end # method to "download" all images # it actually screenshots the html element # to bypass server restrictions def get_img images = @driver.find_elements(tag_name: 'img') progress_length = (images.length) -2 progress_bar = ProgressBar.create(:title => "Progress", :total => progress_length, :length => 80) dir_path = "." dir_path = "#{@current_title}" if @mkdir if not Dir.exists? dir_path Dir.mkdir dir_path end index = 0 images.each do |img| if index > 0 and index < images.length - 1 scrn_dir = "#{@global_count}_#{index}.png" scrn_dir = "#{dir_path}/#{index}.png" if @mkdir img.save_screenshot scrn_dir @img_list << scrn_dir progress_bar.increment end index += 1 end end # method to navigate to the next page def next_page begin next_btn = @driver.find_element(link_text: 'NEXT CHAPTER') rescue @end_state = true end if not @end_state next_btn.click end @current_title = @driver.find_element(tag_name: 'h1').text #update title end def merge_to_pdf puts "Starting merge" puts "output file: #{@savefile}" final_img_list = Magick::ImageList.new(*@img_list) final_img_list.write(@savefile) puts "Finished merging!" end # method to download all images from all volumes def get_img_all while not @end_state puts "Currently downloading: #{@current_title}" get_img next_page @global_count += 1 if not @ch_limit.nil? and @global_count == @ch_limit @end_state = true end end puts "Finished downloading!" end end class MangaGUI include Glimmer def initialize @url, @mkdir, @chlimit, @chlimit_toggle, @savefile = nil, nil, 1, nil, nil @inner_thread = nil @running = false end def launch window('Manga2PDF - GUI', 600, 200) { on_closing do @inner_thread.exit end margined true vertical_box { horizontal_box { group('Manga2PDF') { vertical_box { group('Enter the URL:') @entry = entry { stretchy false on_changed do @url = @entry.text end } group('Savefile name:') @entry2 = entry { stretchy false on_changed do @savefile = @entry2.text end } @checkbox = checkbox('Have separate folders for each chapter?') { stretchy false on_toggled do @mkdir = @checkbox.checked? end } group('Max number of chapters') @checkbox2 = checkbox('Download only a number of chapters') { stretchy false on_toggled do @chlimit_toggle = @checkbox2.checked? end } @spinbox = spinbox(1,9999) { stretchy false value 1 on_changed do @chlimit = @spinbox.value end } @button = button('Download') { stretchy false on_clicked do if not @running @running = true @inner_thread = Thread.new do Glimmer::LibUI.queue_main do @label.text = "Initializing WebScraper" @progressbar.value = 5 end @chlimit = nil if not @chlimit_toggle @manga = Manga2PDF::MangaIMG.new(@url,@mkdir,@chlimit,@savefile) Glimmer::LibUI.queue_main do @label.text = "Moving to #{@url}" @progressbar.value = 15 @label.text = "Downloading images" end @manga.get_img_all Glimmer::LibUI.queue_main do @label.text = "Finished downloading images" @progressbar.value = 75 @label.text = "Merging images" end @manga.merge_to_pdf Glimmer::LibUI.queue_main do @progressbar.value = 100 @label.text = "Finished! You can close the window now" end @running = false end end end } @progressbar = progress_bar { stretchy false } @label = label("Waiting") { stretchy false } } } } } }.show @inner_thread.join end end end Manga2PDF::MangaGUI.new.launch

[0] is a my favorite demonstration of it.

[0]: https://github.com/rails/rails/commit/b83965785db1eec019edf1...

Here's a real life example: Imagine a Ruby on Rails app on which a team of developers are working. The code is hosted on GitLab and all the work is coordinated using GitLab issues. In other words: For every commit, there's an associated issue and the issue number acts as a sort of primary key for documentation, time reporting and so forth. This convention has a few advantages, most notably the ability to easily learn more about how, when and by whom features were implemented as well as how this implementation came to be.

Ruby on Rails is regarded as one of the best ruby frameworks. It was the primary language in developing big projects such as Twitter and helped the language boost the community. Often referred to as “Rails,” Ruby on Rails is a web development framework with an MVC control structure and currently running its 6.1 version. The 16-year-old language has dramatically influenced the web development structures and managing databases, web pages, and other components on a web application.

In Rails 7.1, a new option _instance_methods is introduced, allowing developers to opt-out of the automatic generation of instance methods for enums. When enum is defined with _instance_methods: false, Rails will no longer generate methods like pending?, processed?, etc.

Rails isn't super opinionated about database writes, its mostly left up to developers to discover that for relational DBs you do not want to be doing a bunch of small writes all at once.

That said it specifically has tools to address this that started appearing a few years ago https://github.com/rails/rails/pull/35077

The way my team handles it is to stick Kafka in between whats generating the records (for us, a bunch of web scraping workers) and and a consumer that pulls off the Kafka queue and runs an insert when its internal buffer reaches around 50k rows.

Rails is also looking to add some more direct background type work with https://github.com/basecamp/solid_queue but this is still very new - most larger Rails shops are going to be running a second system and a gem called Sidekiq that pulls jobs out of Redis.

I'm looking forward to see what extractions from this will land on rails. For example: https://github.com/rails/rails/issues/50454

Here is what strict_loading does (source):

Kamal is a wonderfully simple way to deploy your applications anywhere. It will also be included by default in Rails 8. Kamal is trivial, but I don’t recommend using it on your development machine.

Here's the GitHub milestone I've based this article on — https://github.com/rails/rails/milestone/87