It's saturday morning and I have nothing interesting to do. So I thought of scraping Kaymu and list out products and their price using ruby. I targeted raspberry pi for this exercise.

Libraries I used are:

1. httparty to make http request
2. nokogiri to parse html
3. pry for debugging

Here is the commented script:

# requiring dependencies
require 'nokogiri' 
require 'httparty' 
require 'pry'

# kaymu url to search raspberry pi and list them in ascending order of price
SITE = "http://www.kaymu.com.np/catalog/?q=raspberry+pi&sort=price&dir=asc"

# hitting the url to get data
page = HTTParty.get(SITE)

parse_page = Nokogiri::HTML(page)

products_array = []

# acquiring required data using Nokogiri's css methods
parse_page.css('.row-products .product').each do |product|
  products_array.push({item: product.css('h3').text, price: product.css('.price').text})
end

p products_array

Output:

[
{:item => "Raspberry Pi Lcd 3.5 inch", :price => "Rs 3,500 "}, 
{:item => "Raspberry Pi 3.5” TFT with Touch Screen", :price => "Rs 3,970 "},
{:item => "Raspberry Pi - 2 Camera", :price => "Rs 4,669 "}, 
{:item => "Raspberry PI Model B+", :price => "Rs 5,900 "}, 
{:item => "Raspberry Pi Model B+", :price => "Rs 6,330 "}, 
{:item => "Raspberry Pi-2 B Plus with Casing", :price => "Rs 6,899 "}, 
{:item => "5 inch HDMI Touch Screen for Raspberry Pi", :price => "Rs 7,200 "}, 
{:item => "Raspberry Pi 3", :price => "Rs 7,300 "}, 
{:item => "Raspberry Pi 3 (Made in UK)", :price => "Rs 8,299 "}, 
{:item => "Raspberry Pi 3 Model B", :price => "Rs 8,500 "}
]

If you want to learn scrapping yourself, you can follow better tutorial here.