Wednesday, September 23, 2009

Dump those fixtures

I hate testing/debugging a rails application on "unreal" data. At the same time I find writing fixtures by hand is a big pain. I wrote this rake task to dump all the data in fixtures folder by (rake test:fixtures:dump) on a production environment, bring it to development environment and do a rake test:fixtures:load

desc "Dump all the data from DB to fixtures in YML format"
namespace :db do
namespace :fixtures do
task :dump => :environment do
require 'active_record/fixtures'
base_dir = ENV['FIXTURES_PATH'] ? File.join(Rails.root, ENV['FIXTURES_PATH']) : File.join(Rails.root, 'test', 'fixtures')
fixtures_dir = ENV['FIXTURES_DIR'] ? File.join(base_dir, ENV['FIXTURES_DIR']) : base_dir

Dir.entries(File.join(RAILS_ROOT, "app", "models")).each{|filename|
if /\.rb$/.match(filename)
model = Kernel.const_get(filename.gsub(".rb", "").camelcase)
if model.ancestors.include?(ActiveRecord::Base) and model.table_exists?
puts "Dumping #{model}"
file ="test", "fixtures", model.table_name+".yml"), "w")
counter = 1
model.find_in_batches(:batch_size => 5000){|rows|
file.puts "#{counter}:"
file.puts row.attributes.to_yaml.split("\n")[1..-1].collect{|x| "\s\s"+x}.join("\n")
puts " -- Created a file with #{counter} rows"

Wednesday, September 09, 2009

Shootout: Jruby1.3.1 vs Ruby1.8.7 vs Ruby1.9.2 vs Python2.6 vs Java6

Click on the image to view it clearly

Jruby is the fastest among Jruby, Ruby and Python. Benchmark program was a fractal geometry program posted here.

Language Time for 100 iterations times slower than java with -server
java –server 0.18 1
Ruby1.8 7.78 44.07
Ruby1.9.2 4.2 23.78
Jruby 2.5 14.16
Jruby1.3.1—sever 2.31 13.1
java 0.18 1.01
python 3.04 17.21