Scraping kata

scraping_kata.rb

require 'nokogiri'
require 'open-uri'

class User

  attr_reader :name, :clan, :honor

  def initialize(name, clan, honor)
    @name, @clan, @honor = name, clan, honor
  end

end

class Leaderboard

  @@leaderboard = []

  def self.position
    url = 'https://www.codewars.com/users/leaderboard'
    page = Nokogiri::HTML(open(url), nil, Encoding::UTF_8.to_s)
    rows = page.css("[class='leaderboard pan'] > table > tr")
      rows.each do |row|
        name, clan, honor = row.css('a').text, row.css('td[3]').text, row.css('td[4]').text.to_i
        @@leaderboard << User.new(name, clan, honor)
      end
    @@leaderboard
  end
end

def solution
  Leaderboard.position
end

Solution

require 'nokogiri'
require 'open-uri'

class User

  attr_reader :name, :clan, :honor

  def initialize(name, clan, honor)
    @name, @clan, @honor = name, clan, honor
  end

end

class LeaderboardArray < Array
  def size
    length-1
  end
end

class Leaderboard

  @@leaderboard = LeaderboardArray.new

  def self.position
    url = 'https://www.codewars.com/users/leaderboard'
    page = Nokogiri::HTML(open(url), nil, Encoding::UTF_8.to_s)
    rows = page.css("[class='leaderboard pan'] > table > tr")
      rows.each do |row|
        name, clan, honor = row.css('a').text, row.css('td[3]').text, row.css('td[4]').text.to_i
        @@leaderboard << User.new(name, clan, honor)
      end
    @@leaderboard
  end

end

def solution
  Leaderboard
end

Test-cases

leaderboard = solution

  describe "should have a size of 500" do
    Test.assert_equals(leaderboard.position.size, 500 )
  end
  describe "should contain the correct names" do
    Test.assert_equals(leaderboard.position[1].name, 'g964')
    Test.assert_equals(leaderboard.position[2].name, 'myjinxin2015')
    Test.assert_equals(leaderboard.position[3].name, 'Voile')
    Test.assert_equals(leaderboard.position[4].name, 'SteffenVogel_79')
    Test.assert_equals(leaderboard.position[5].name, 'smile67')
  end
  describe "should contain the correct clan" do
    Test.assert_equals(leaderboard.position[1].clan, 'None')
    Test.assert_equals(leaderboard.position[2].clan, '中国 长垣')
    Test.assert_equals(leaderboard.position[3].clan, 'Gensokyo')
    Test.assert_equals(leaderboard.position[4].clan, 'CSV - SLayer')
    Test.assert_equals(leaderboard.position[5].clan, 'PropertyExpert, Germany')
  end
  describe "should contain the correct honor" do
    Test.assert_equals(leaderboard.position[1].honor > 110000, true)
    Test.assert_equals(leaderboard.position[2].honor > 110000, true)
    Test.assert_equals(leaderboard.position[3].honor > 60000, true)
    Test.assert_equals(leaderboard.position[4].honor > 55000, true)
    Test.assert_equals(leaderboard.position[5].honor > 50000, true)
  end

@bestwebua
The tests use Nokogiri's default encoding("ASCII-8bit").
Change
page = Nokogiri::HTML(open(url), nil, Encoding::UTF_8.to_s)
to
page = Nokogiri::HTML(open(url))

@10XL my new code with struct instead class. It has passed all tests.

require 'nokogiri'
require 'open-uri'

class LeaderboardArray < Array
  def size
    length-1
  end
end

class Leaderboard
  def self.build
    Struct.new('Warrior', :name, :clan, :honor)
    @@leaderboard = LeaderboardArray.new

      url = 'https://www.codewars.com/users/leaderboard'
      page = Nokogiri::HTML(open(url))
      rows = page.css("[class='leaderboard pan'] > table > tr")

        rows.each do |row|
          name, clan, honor = row.css('a').text, row.css('td[3]').text, row.css('td[4]').text.to_i
          @@leaderboard << Struct::Warrior.new(name, clan, honor)
        end

    @@leaderboard
  end

  def self.position
    @@leaderboard ||= self.build
  end
end

def solution
  Leaderboard
end