How to pass to CSV file only the first five tracks? [closed] - ruby

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require "openssl"
require "nokogiri"
require 'csv'
require "open-uri"
OpenSSL::SSL::VERIFY_PEER = OpenSSL::SSL::VERIFY_NONE
$n=0
#~ Open_Page
page = ('http://www.residentadvisor.net/dj/aguycalledgerald/tracks?sort=mostcharted')
html = Nokogiri::HTML(open(page))
#~ Array
names= []
html.css('a').each do |x|
names<< x.text.strip.gsub(/\t/,'')
names.delete('RA on YouTube')
names.delete('Login')
names.delete('Register')
names.delete('Resident Advisor')
names.delete('Submit')
names.delete('Listings')
names.delete('Clubs')
names.delete('News')
names.delete('Reviews')
names.delete('Features')
names.delete('Films')
names.delete('Submit event')
names.delete('Artists')
names.delete('Photos')
names.delete('DJ Charts')
names.delete('Labels')
names.delete('Podcasts')
names.delete('Search')
names.delete('Top 1000')
names.delete('Top 100')
names.delete('Local')
names.delete('Favourites')
names.delete('Create an artist profile')
names.delete('Reviews')
names.delete('Features')
names.delete('A')
names.delete('B')
names.delete('C')
names.delete('D')
names.delete('E')
names.delete('F')
names.delete('G')
names.delete('H')
names.delete('I')
names.delete('J')
names.delete('K')
names.delete('L')
names.delete('M')
names.delete('N')
names.delete('O')
names.delete('P')
names.delete('Q')
names.delete('R')
names.delete('S')
names.delete('T')
names.delete('U')
names.delete('V')
names.delete('W')
names.delete('X')
names.delete('Y')
names.delete('Z')
names.delete('0-9')
names.delete('RA')
names.delete('About')
names.delete('Advertise')
names.delete('Jobs')
names.delete('RA In Residence')
names.delete('Ticketing FAQ')
names.delete('Sell tickets on RA')
names.delete('Privacy')
names.delete('Terms')
names.delete('RA is also available in Japanese. 日本版')
names.delete('Download the RA Guide')
names.delete('RA on Twitter')
names.delete('RA on Facebook')
names.delete('RA on Google+')
names.delete('RA on Instagram')
names.delete('RA on Soundcloud')
names.delete('Biography')
names.delete('Events')
names.delete('Tracks')
names.delete('RA News')
names.delete('RA Editorial')
names.delete('Remixes')
names.delete('Solo productions')
names.delete('Collaborations')
names.delete('Laboratory Instinct')
names.delete('Highgrade Records')
names.delete('Bosconi')
names.delete('!K7')
names.delete('Perlon')
names.delete('Beatstreet')
names.delete('Title')
names.delete('Label')
names.delete('Release Date')
names.delete('51 chartings')
puts names
end
#~ To_CSV
for $n in 0..names.count do
CSV.open('Most_Charted.csv','a+') do |csv|
csv << [names[$n]]
end
end
That creates a CSV file with:
PositiveNoise (Carl Craig remix) System 7 & Guy Called Gerald A-Wave 22 chartings
Voodoo Ray (Shield Re-Edit) A Guy Called Gerald 18 chartings
Falling (D. Digglers Cleptomania remix) Tom Clark & Benno Blome feat.
A Guy Called Gerald 18 chartings
How Long Is Now A Guy Called Gerald 14 chartings
Groove Of The Ghetto A Guy Called Gerald 12 chartings
Voodoo Ray A Guy Called Gerald 10 chartings
Falling (D Diggler's Rescue remix) Tom Clark & Benno Blome feat. A
Guy Called Gerald 9 chartings
and so on.
How do I pass only the first 5 song names to the CSV file?

Answer 1

Be sure you know what you are doing when you disable SSL checks.
You can find a better selector for the track list, so you do not need all those "deletes". The tracks are all inside ul.tracks
Then i'd suggest you make the whole thing a class. So you can encapsulate the behavior. And then don't use $ globals. Not needed and usually a sign of bad code.
Here is a working sample:
require "openssl"
require "nokogiri"
require 'csv'
require "open-uri"
OpenSSL::SSL::VERIFY_PEER = OpenSSL::SSL::VERIFY_NONE
class Tracklist
def initialize(url)
#url = url
end
def parse(top = nil)
html = Nokogiri::HTML(open(url))
result = []
html.css('ul.tracks li').each do |node|
title = node.css('div.title a:nth-child(1)').first
result << title.text if !title.nil?
break if top && result.length == top
end
result
end
private
attr_reader :url
end
list = Tracklist.new("https://www.residentadvisor.net/dj/aguycalledgerald/tracks?sort=mostcharted")
p list.parse(5)
If you need more information about the tracks, then you can extract more details in the loop inside the parsemethod.
This code stops parsing after top has been reached. Afterwards you can build your CSV as you like.