Ruby on Rails Class Flyer

1. I made a branch of my project:

   git checkout -b jruby-test

2. Install jruby via rvm

   rvm install jruby-1.6.2

3. I editted my .rvmc to use Jruby instead of MRI, from:

   rvm use 1.9.2@proj

   to

   rvm use jruby-1.6.2@proj-jruby

4. I updated my rmvc from :

   rvm use 1.9.2@proj

   to

   rvm use jruby-1.6.2@proj-jruby

5. I edited my Gemfile. This is where I knew it would get tricky.
   1. Removed:

      gem 'pg'

   2. Added:

      gem 'activerecord-jdbc-adapter'
      gem 'activerecord-jdbcpostgresql-adapter'
      gem 'jdbc-postgres'

   3. Found out hard way had to remove ruby-debug19. DUh, dude
   4. Texticle gem does not work. This makes sense because it is plugin to postgres ActiveRecord driver. However, I use this for my minimalistic search functionality.
6. Ran ‘rake spec’ on the project. My tests for the search feature failed as expected because of the missing Texticle dependency. I had one test that was failing on
   Regular expression. The regular expression looked like this:

   if last_item =~ /sector|leverage_point/

   When examined the code a bit, I found out that last_item was actually a symbol. I guess MRI automatically converts symbols to strings for Regular Expressions and JRuby does not. I changed the line to:

   if last_item.to_s =~ /sector|leverage_point/

   and it worked fine

7. Ran ‘rails s thin’ and my app was up and running.

Not bad for a JRuby amatuer. Although not having the Texticle gem is a show stopper on this project.
It’s not that Texticle is the best solution for search but we have some code written in it.

Make a new workspace, similar to ‘git clone’ or ‘svn co’:

accurev mkws -w workspacename -b streamname_from_server -l local_directory

Note: accurev workspaces are similiar to a cloned git repo, kind of but not really…. Are you confused yet?

Update my workspace from the stream, similiarly to a “git pull”:

accurev update

Get status of my workspace, ie, see what’s changed. Same as “git status” or “svn st”:

accurev stat -n

With the ‘accurev stat -n’ command, unlike git, the files shown will be in relation to your current working directory. So if you do:

cd db/migrate
accurev stat -n

You will only see files you have changed in your db/migrate folder. (Why are you changing your migrations???)

In accurev, file not checked into the work space are called “external” files, you see all these with this:

accurev stat -x

Add external file, same as “git add” or “svn add”:

accurev add -x path/to/file
# or add a directory
accurev add -x -d directory

Revert a file, same as “git checkout” or “svn revert”:

accurev purge path/to/file

Promote all kept files to the stream, kind like “git push” or “svn commit” but more like “git push”

accurev promote –c “JIRA-666 comment” –k

I’ll add more as my project progresses…

accurev keep -R -n -c "codenarc fixes" grails-app/domain

spec/acceptance
spec/controllers
spec/fixtures
spec/helpers
spec/javascripts
spec/lib
spec/mailers
spec/models
spec/support

The spec files in my acceptance folder are my capybara/selenium tests and still in experimental phase. I don’t want them to run every time and definitely don’t want the CI server running them. However, when I run ‘rake’ or ‘rake spec’, it runs everything in my ‘spec’ folder. I want it it to run the specs in every directory except acceptance.

I discovered there is not easy way to override a rake task. Redefining the task appends to it which to me is a pretty intuitive default behavior. Apparently, dchemsky knows about this and has opened an issue with rake. I was able to piece together a solution from an old blog post by Jay Fields.

Feel free to comment if you have a better way to do it.

 
require 'rake'
require 'rspec/core/rake_task'
 
class Rake::Task
  def abandon
    @actions.clear
  end
end
Rake::Task[:spec].abandon
 
RSpec::Core::RakeTask.new(:spec) do |t|
  t.pattern = "spec/{models,views,controllers,helpers}/**/*_spec.rb"
end
 
namespace :spec do
  desc "Run the code examples in spec/acceptance"
  RSpec::Core::RakeTask.new(:acceptance => "db:test:prepare") do |t|
    t.pattern = "spec/acceptance/**/*_spec.rb"
  end
end

If this is your helper:

module ItemsHelper
  def custom_item_display(item)
    item.to_s
  end
end

And you have a route that looks like this:

  resources :items

On the console, you would do this:

ruby-1.9.2-p136 :001 > item = "hello world"
ruby-1.9.2-p136 :002 > helper.extend ItemsHelper
ruby-1.9.2-p136 :003 > helper.custom_item_display(item)
 => "hello world" 
ruby-1.9.2-p136 :004 > include ActionController::UrlWriter
 => Object 
ruby-1.9.2-p136 :005 > items_path
 => "/items"

In the rake task you do this:

namespace :example do
  desc "Do example items"
  task :items => :environment do
    item = "Hello World"
    include ItemsHelper
    puts "ItemsHelper.custom_item_display(item) = #{custom_item_display(item)}"
 
    include ActionController::UrlWriter
    puts "items_path = #{items_path}"
  end
end

Hope that helps.

You will need FreeTDS to connect to MSSQL Server on Unix-based environments. You MUST use Homebrew to install FreeTDS on the Mac. MacPorts is evil and will not install FreeTDS correctly. Installation of Homebrew is covered excellently in the Homebrew installation docs:
https://github.com/mxcl/homebrew/wiki/installation

Edit the FreeTDS configuration for the FreeTDS library:

brew edit freetds

Replace from “def install” to “end ” with:

def install 
  args = ["--prefix=#{prefix}",
          "--with-tdsver=7.0",
          "--enable-msdblib",
          "--mandir=#{man}"]
 
  system "./configure", *args
  system 'make'
  system 'make install'
end

Install FreeTDS:

brew install freetds

Add an entry to the bottom of your freetds.conf for your MSSQL Server. This file is found at /usr/local/etc/freetds.conf:

[my_sql_server] 
host = <hostip>
port = 1433 
tds version = 7.0

Add the TinyTDS and activerecord-sqlserver-adapter gems to your Rails Gemfile.

  gem 'tiny_tds'
  gem 'activerecord-sqlserver-adapter', :require => false

Run bundler to install the gems:

bundle install

Finally, add the connection to your database.yml file:

development:
  adapter: sqlserver
  mode: dblib
  dataserver: my_sql_server
  database: my_database_name
  username: my_username
  password: xxxxx
  timeout: 5000

A reference for installing UnixODBC (which I don’t recommend), you can follow this tutorial:
MSSQL2005 on Rails on Snow Leopard (the easiest way I know how.)

• Toilet Paper: Anyone who has moved before knows one thing: Books are heavy. Guess what books are made of?…. PAPER! That’s right, the same thing that they use to make toilet paper. I suggest you lighten your toilet paper load. Next time you go to the bath room, make note of how much toilet paper you need. How many times do you wipe? If you average 3-4 wipes, can use only 2 squares per wipe and can estimate you will be going to the bathroom 2 times a day, do some math, figure out how much mountain money you will REALLY need. If you are a guy, congratulations, you can bring less TP. Don’t tell the girls this, they may ask you to carry their tent.
• Deodorant: Seriously? All or some of your backpacking buddies are gonna smell worse than the slums of Manila. Why are you going out our way to smell good? Leave this item at home.
• Camera: Skip it. Don’t worry, one of you buddies will bring a camera especially if you are with a big group. One of them may even carry a tripod, a monopod and so much other camera gear that he is going to need a hip replacement by the age of 35. Don’t be that guy. Plus, think about it: if you are taking all the picture, you won’t be in any of them. My wiser older brother once told me: a picture without a person is postcard. If you want pictures of the scenery, just go on flickr and do a search. Chance are pretty good someone else has been there. Make their image your wallpaper. When your co-workers comes, you can brag about what a great trip you had and how much cooler you are than them. Go ahead, gloat away. You’ve got the wallpaper to back it up.
• Tent: So, you hiked all the way out into the woods so you can sleep INDOORS. Forget that. I have seen someone make a very sustainable shelter out of a rain tarp. You just need to be creative. Cavemen didn’t always make it back to the cave and they didn’t have REI either. What did they do? If the going gets really rough, you can sneak into your buddy’s tent.
• Water: I don’t think I need to ask this but what human do you know that will deny another person water?… and you can always count on others to carry water.

This only some of the great ideas that will be present in my new book on backpacking. Please e-mail to preorder it.

  <FilesMatch "\.(?i:fasta)$">
    ForceType application/x-fasta
    Header set Content-Disposition attachment
  </FilesMatch>
  <FilesMatch "\.(?i:aln)$">
    ForceType application/x-aln
    Header set Content-Disposition attachment
  </FilesMatch>

You will have to enable the apache module “mod_header” for this to work.

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require 'rubygems'
require 'hpricot'
require 'open-uri'
 
#term = '1-YR ARM'
#term = '30-YR Fixed'
term = '15-YR Fixed'
 
doc = Hpricot.parse(open("http://www.hicentral.com/MortgageRates.asp")) 
 
rates = [] 
lender_name = ""
 
(doc/"table"/"table"/"tr").each do | row |
   arr =[]
   (row/"td").each do | cell|  
     arr << cell.inner_html() 
   end
   if arr[1] =~ /15-YR Fixed/
      lender_name = arr[0]
      arr.delete(lender_name) 
      lender_name.sub!('<br />',' - ')
   end
   next unless arr[0] =~ /#{term}/
   lender_data ={} 
   lender_data[:lender_name] = lender_name    
   lender_data[:term] = arr[0] 
   lender_data[:apr] = arr[3].to_f
   rates << lender_data
end
 
5.times do | rank |
  puts "Losest Rate ##{rank+1}"
  row = rates.min{|a,b| a[:apr] <=> b[:apr] } 
  puts "  Name: #{row[:lender_name]}"  
  puts "  Term: #{row[:term]}" 
  puts "  APR: #{row[:apr]}"  
  rates.delete(row)
end

Here’s what’s going on:

• On line 7 you will notice that I am interested in the 15-Year mortgage rate. You can change this value to get the report for the term you want.
• On line 9, the program will download the latest rates from the hicentral.com website and parse the page returning an hpricot doc object.
• From line 14 to 30, the program parses each line in the mortgage rate table. The logic is custom to this table. The table is unusual because the lender name is first cell only on the first line (15-YR Fixed) for each lender. To accommodate this, we match the line that has “15-YR Fixed” in second position and delete the lender name from the array (lines 19-23). We then assign the data to our summary data structure (lines 25-29)
• Finally, we show the top 5 lowest mortgage rates (lines 32-38). To do this we use the Ruby max method (line 34). We delete the current max element so it is not counted in the next loop iteration (line 38).

Thomas Lecklider has a great tutorial on how to use Hpricot called Using Hpricot to Traverse and Parse HTML.

Your commends are welcome. Give some refactoring advice if you like. I have wordpress plugin for pre tag so to write ruby code just do:

<pre lang="ruby">
puts YEAH
</pre>

Pretty common, here’s how you do it:

Perl:

use File::Basename; 
$fullname = "/usr/local/src/perl-5.6.1.tar.gz"; 
$file = basename($fullname);

PHP:

$path = "/home/httpd/html/index.php";
$file = basename($path);

Ruby:

path = "/usr/lib/ruby/site_ruby/1.8/rubygems/version.rb"
File.basename path

Python:

import os.path
path =  "/usr/local/bin/python"
os.path.basename(path)

T-SQL (MsSQL Server):

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CREATE FUNCTION [dbo].[fn_file_basename]
(
	-- Add the parameters for the function here
	@file_path VARCHAR(255)
)
RETURNS VARCHAR(255)
AS
BEGIN
    DECLARE @file_basename VARCHAR(255)
    IF charindex('\', @file_path) != 0 
	   set @file_basename= reverse(substring(reverse(@file_path), 1, charindex('\', reverse(@file_path))-1))
	else
	   set @file_basename=@file_path
 
	return @file_basename
END

My brilliant co-worker figured this out. The magic is done on line 11:

reverse(SUBSTRING(reverse(@file_path), 1, charindex('\', reverse(@file_path))-1))

It reverses the string, find the first occurance of the character ‘\’, takes the substring to that character and the reverses again. How elegant!