Ruby on Rails | Amit Yadav

Compile & install Nginx web server

Posted on 23-06-2008 | By: Amit

 # See:
# - http://en.wikipedia.org/wiki/Nginx
# - http://wiki.codemongers.com/NginxGettingStarted
# - http://wiki.codemongers.com/NginxInstallOptions
# - http://wiki.codemongers.com/NginxCommandLine
# - http://wiki.codemongers.com/NginxConfiguration
 
export PATH="/usr/local/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin"
 
mkdir -p ~/Desktop/Nginx
cd ~/Desktop/Nginx
 
curl -L -O http://sysoev.ru/nginx/nginx-0.7.2.tar.gz
tar -xzf nginx-0.7.2.tar.gz
 
curl -L -O http://downloads.sourceforge.net/pcre/pcre-7.7.tar.gz
tar -xzf pcre-7.7.tar.gz
 
cd ~/Desktop/Nginx/nginx-0.7.2
./configure --help
./configure --prefix=/usr/local/nginx --sbin-path=/usr/local/sbin --with-debug --with-http_ssl_module --with-pcre=../pcre-7.7
make
sudo make install
 
which nginx
otool -L /usr/local/sbin/nginx
open /usr/local/nginx
open -e /usr/local/nginx/conf/nginx.conf
 
nginx -v
nginx -V
sudo nginx # start server
sudo nginx -t
 
open http://localhost:80
open http://localhost:80/50x.html
 
sudo nano /usr/local/nginx/conf/nginx.conf # editing ... server { listen 8080; ...
 
# reload configuration
sudo kill -HUP `cat /usr/local/nginx/logs/nginx.pid`
 
# stop server
sudo kill -15 $(ps -auxxx | egrep "[n]ginx.*master" | awk '{ print $2 }') 2&gt;/dev/null

Create a Hash from two Array objects

Posted on 23-06-2008 | By: Amit

Category : Ruby on Rails

Requires Ruby 1.8.7 or higher.

^?View Code RUBY

keys = [1,2,[3,4]]
[1, 2, [3, 4]]
values = ['a','b',['c','d']]
["a", "b", ["c", "d"]]
Hash[ * keys.zip(values).flatten(1) ]
{1=&gt;"a", [3, 4] =&gt; ["c", "d"], 2 =&gt; "b"}

File Upload Helpers

Posted on 16-06-2008 | By: Amit

Category : Ruby on Rails

Handy little helpers to check if a file was provided to a controller, and to save it.

^?View Code RUBY

 def file_provided?
   [StringIO, Tempfile].include?(@file.class) and @file.size.nonzero?
 end 
 
 def save_file
   if @file.is_a? Tempfile
     FileUtils.cp(@file.path, path)
   elsif @file.is_a? StringIO
     File.open(path, "wb") { |disk_file| disk_file &lt;&lt; @file.read }
   end
 end

Renaming your .rhtml to .erb on EdgeRails

Posted on 16-06-2008 | By: Amit

Category : Ruby on Rails

Tags: Ruby

^?View Code RUBY

## just slap this in your rake file or in lib/tasks
 
namespace 'views' do
  desc 'Renames all your rhtml views to erb'
  task 'rename' do
    Dir.glob('app/views/**/*.rhtml').each do |file|
      puts `svn mv #{file} #{file.gsub(/\.rhtml$/, '.erb')}`
    end
  end
 end
 
 ## or if you have rhtml and rxml you could probably use the following (untested)
 
 namespace 'views' do
   desc 'Renames all your rhtml views to erb'
   task 'rename' do
     Dir.glob('app/views/**/*.rhtml').each do |file|
       puts `svn mv #{file} #{file.gsub(/\.(rhtml|rxml)$/, '.erb')}`
     end
   end
 end

Automatically tagging releases with capistrano

Posted on 16-06-2008 | By: Amit

Category : Ruby on Rails

Tags: capistrano

Even though Capistrano “tags” each release by creating a new folder on the production server(s), it might be interesting to have a historical perspective in your repository anyway. This makes it easier to know exactly what went up for a release. I would like to share the following Capistrano recipe for your pleasure: config/deploy.rb

^?View Code RUBY

 require ‘uri‘
 task :after_deploy do
   source = repository
   dest = URI.parse(repository).merge(“../releases/#{File.basename(release_path)}“)
   cmd = “svn copy –revision=#{revision} –quiet –message \”Auto tagging release #{release_path}\” #{source} #{dest}“
   puts cmd
   `#{cmd}`
 end

First, we start by requiring uri, because Subversion does not like relative URLs. Next, we find the location into which to tag the release, and finally, we just do it. Simple, effective. Enjoy !

Exporting development data to fixture files for your test (Ruby)

Posted on 12-06-2008 | By: Amit

Category : Ruby on Rails

For your unit & functional tests you have to provide input data to your test files and you do that through fixtures. The script below extracts the data from the development data base and puts it to the fixture file for each table.

^?View Code RUBY

namespace :db do
  desc 'Create YAML test fixtures from data in an existing database.
  Defaults to development database. Set RAILS_ENV to override.'
 
  task :extract_fixtures =&gt; :environment do
    sql = "SELECT * FROM %s"
    skip_tables = ["schema_info", "sessions"]
    ActiveRecord::Base.establish_connection
    tables = ENV['FIXTURES'] ? ENV['FIXTURES'].split(/,/) : ActiveRecord::Base.connection.tables - skip_tables
    tables.each do |table_name|
      i = "000"
      File.open("#{RAILS_ROOT}/test/fixtures/#{table_name}.yml", 'w') do |file|
        data = ActiveRecord::Base.connection.select_all(sql % table_name)
        file.write data.inject({}) { |hash, record|
          hash["#{table_name}_#{i.succ!}"] = record
          hash
        }.to_yaml
      end
    end
  end
end

shame.rake

Posted on 12-06-2008 | By: Amit

Category : Ruby on Rails

If you’ve ever been working on a Rails application and found yourself [stupidly] slipping in your testing, We have just the tool for you. Using rake and rubyosa, you can now automatically post your Code to Test Ratio as your iChat status message—meaning you can now use shame and self-humiliation to keep you motivated. After you’ve installed rubyosa, add shame.rake to your lib/tasks directory. The file contains:

^?View Code RUBY

require 'rbosa'
require 'code_statistics'
 
task :shame do
  stats = CodeStatistics.new(*STATS_DIRECTORIES)
  code  = stats.send :calculate_code
  tests = stats.send :calculate_tests
  ichat = OSA.app('ichat')
  msg = "Code To Test Ratio: 1:#{sprintf("%.1f", tests.to_f/code)}"
  ichat.status_message = msg
  $stderr.puts %|iChat status set to: #{msg.inspect}|
end

Simple method to find age of person

Posted on 12-06-2008 | By: Amit

Category : Ruby on Rails

^?View Code RUBY

1
2
3

def age
   ((Time.now - birthday) / (60*60*24)/365.2422).to_i
end

Rails Image Cropping

Posted on 09-04-2008 | By: Amit

Category : Ruby on Rails

Tags: crop, Rails

I was looking for an UI for image cropping utility for my project and came across this, it was using php as its backend but i changed it to use rails as its backend. The UI is simple and can be incorporated with different backend solutions.

Here is the code.