celeiro.rb

require 'nokogiri'
require 'open-uri'

Encoding.default_external = 'UTF-8'
query = params['query'] || 'banana'
page = params['page'].to_i || 0
url = "https://www.celeiro.pt/catalogsearch/result/?q=#{query}"
document = Nokogiri::HTML(open(url))

search_items = document.css('ol.product-items > li.item').map do |tile|
  title = tile.css('a.product-item-link').text()
  price = tile.css('span.price').text()
  img_url = tile.css('img.product-image-photo').attr('src')&.value
  brand = tile.css('div.brand > a')&.text()
  qty_info = tile.css('div.apresentacao').text().split('•').map(&:strip)
  unit = qty_info.first if qty_info.size > 0
  quantity = qty_info.last if qty_info.size > 1
  destiny_url = tile.css('a.product-item-link').attr('href')&.value
  supermarket = 'Celeiro'

  {
    title: title,
    price: price,
    unit: unit,
    img_url: img_url,
    brand: brand,
    quantity: quantity,
    destiny_url: destiny_url,
    supermarket: supermarket
  }
end

{
  query: query,
  page: page,
  search_items: search_items,
  url: url
}