问题
I wrote this ruby script to scrape product info from the manufacturer website. The scraping and storage of the product objects in an array works, but I can't figure out how to export the array data to a csv file. This error is being thrown: scraper.rb:45: undefined method `send_data' for main:Object (NoMethodError)
I do not understand this piece of code. What's this doing and why isn't it working right?
send_data csv_data,
:type => 'text/csv; charset=iso-8859-1; header=present',
:disposition => "attachment; filename=products.csv"
Full code:
#!/usr/bin/ruby
require 'rubygems'
require 'anemone'
require 'fastercsv'
productsArray = Array.new
class Product
attr_accessor :name, :sku, :desc
end
# Scraper Code
Anemone.crawl("http://retail.pelicanbayltd.com/") do |anemone|
anemone.on_every_page do |page|
currentPage = Product.new
#Product info parsing
currentPage.name = page.doc.css(".page_headers").text
currentPage.sku = page.doc.css("tr:nth-child(2) strong").text
currentPage.desc = page.doc.css("tr:nth-child(4) .item").text
if currentPage.sku =~ /#\d\d\d\d/
currentPage.sku = currentPage.sku[1..-1]
productsArray.push(currentPage)
end
end
end
# CSV Export Code
products = productsArray.find(:all)
csv_data = FasterCSV.generate do |csv|
# header row
csv << ["sku", "name", "desc"]
# data rows
productsArray.each do |product|
csv << [product.sku, product.name, product.desc]
end
end
send_data csv_data,
:type => 'text/csv; charset=iso-8859-1; header=present',
:disposition => "attachment; filename=products.csv"
回答1:
File.open('filename.csv', 'w') do |f|
f.write(csv_data)
end
回答2:
If you are new to Ruby, you should be using Ruby 1.9 or later, in which case you can use the built-in CSV output which builds in fast csv plus l18n support:
require 'csv'
CSV.open('filename.csv', 'w') do |csv|
csv << [sku, name, desc]
end
http://ruby-doc.org/stdlib-1.9.2/libdoc/csv/rdoc/CSV.html
回答3:
It probably makes more sense to do:
@csv = FasterCSV.open('filename.csv', 'w')
and then write to it as you go along:
@csv << [sku, name, desc]
that way if your script crashes halfway through you've at least got half of the data.
来源:https://stackoverflow.com/questions/10679058/ruby-scraper-how-to-export-to-csv