Analyze the update ranking of "随時更新" items.

qiita-update-ranking.rb

require 'minitest/autorun'
require 'json'
require 'date'

def execute
  # How to create qiita.json
  # 1. curl -o qiita.json https://qiita.com/api/v2/items?page=1&per_page=100&query=title%3A%E9%9A%8F%E6%99%82%E6%9B%B4%E6%96%B0
  # 2. curl -o qiita.json https://qiita.com/api/v2/items?page=2&per_page=100&query=title%3A%E9%9A%8F%E6%99%82%E6%9B%B4%E6%96%B0
  # 3. Merge them manually
  path = '/Users/jit/Desktop/qiita.json'
  str = File.read(path)
  JSON.parse(str)
end

class Item
  attr_reader :title, :created_at, :updated_at, :url, :tags, :user

  def initialize(hash)
    @title = hash['title']
    @created_at = Date.parse hash['created_at']
    @updated_at = Date.parse hash['updated_at']
    @url = hash['url']
    @tags = hash['tags'].map{|h| h['name']}
    @user = hash['user']['id']
  end

  def to_s
    "#{title}\t#{tags.join(', ')}\t#{user}\t#{created_at}\t#{updated_at}\t#{update_span}\t#{url}"
  end

  def inspect
    to_s
  end

  def update_span
    (updated_at - created_at).to_i
  end

  def <=>(other)
    ret = update_span <=> other.update_span
    ret == 0 ? created_at <=> other.created_at : ret
  end
end

class QiitaTest < MiniTest::Test
  def test_qiita
    array = execute
    items = array.map{|hash| Item.new(hash)}
    puts items.sort.reverse
  end
end