scraping public fb group - first post stats

fb_group_first_post_stats.rb

# frozen_string_literal: true

require 'selenium-webdriver'

def look_into(fb_group_url)
  return unless block_given?

  options = Selenium::WebDriver::Chrome::Options.new(args: ['headless', 'disable-gpu', '--window-size=750,1080'])
  driver = Selenium::WebDriver.for :chrome, options: options
  driver.get(fb_group_url)
  sleep 3
  first_post = driver.find_element(css: 'div[role=article]')
  permalink_el = first_post.find_element(css: 'a[href*="permalink"')['href']
  sleep 3
  # load more posts
  # driver.execute_script('window.scrollBy(0,1000)')
  likes_count = first_post.find_element(css: '[data-testid="UFI2ReactionsCount/sentenceWithSocialContext"]').text.to_i
  comments_count = first_post.find_element(css: '[data-testid="fbFeedStoryUFI/feedbackSummary"]').text.scan(/(\d+)\s(\W+)/i)&.first&.first.to_i
  post_stats = {
    url: fb_group_url,
    likes: likes_count,
    comments: comments_count
  }
  yield post_stats
end

page_url = 'https://www.facebook.com/groups/yosoylamilonga/'
look_into(page_url) do |first_post_stats|
  puts format(%(
    Looking into fb group at %{url}.
    It has:
      - %{likes} likes
      - %{comments} comments
  ), first_post_stats)
end