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Making SUPERFAST THINGS in Ruby (Using C Extensions)

July 29th, 2010 by fugufish

I will address one of the primary uses for a C extension in Ruby, speed. Due to it’s very nature, Ruby is slow (as compared to compiled languages like C). It gets the job done, but sometimes it takes it’s sweet time doing it. Sometimes it is necessary to speed things up a bit, and here enter C extensions. There are several methods of implementing extensions, from the generic C extension, to ruby-inline. In this particular article I will focus on the generic C extension.

In this example, I am going to use a fairly inefficient piece of Ruby code I created a while ago for Project Euler (Problem 10) for finding the sum of all primes under 2000000:

class Integer
  def prime?
    return true if self == 2
    return false if (self & 1) == 0
    square = Math.sqrt(self).round + 1
    i = 1
    while i 

At the time that I wrote this, I was relatively unaware of more efficient ways of resolving prime numbers (such as a euler sieve), however the code still ran under the allotted 2 minute window (52 seconds) so I went with it. Now to speed it up. To write a C extension you need, at a bare minimum two things:

  1. an extconf.rb file - this file is used by ruby to generate the Makefile that is used to compile the extension
  2. the source file for the extension (in this case primed.c)

Here is a look at these two files for my new version of problem 10:

#include "ruby.h"
VALUE Primed;

VALUE method_prime(VALUE obj, VALUE args)
	register uint64_t n;
	n = NUM2INT(obj);
	if (n == 2)
		return Qtrue;
	if ((n & 1) == 0)
		return Qfalse;

	register uint64_t sqrt_n = ((uint64_t)sqrt(n)) + 1;
	register uint64_t i=3;
	for (i; i


# Loads mkmf which is used to make makefiles for Ruby extensions
require 'mkmf'

# Give it a name
extension_name = 'primed'

# The destination

# Do the work

First let me explain primed.c. The objective of this extension is to determine whether or not a number is prime, so that an integer can call x.prime? and return true or false. It is essentially identical to the method used in the pure ruby script above. One of the first thing you may notice is this line:

VALUE Primed

VALUE is a data type defined by Ruby that represents the Ruby object in memory. It is basically a struct that contains the data related to the object. In this case, the object will represent the "Primed" module in ruby, so it will contain data about the instance methods, variables, etc. for that module. All Ruby objects are represented in C by VALUE, regardless of their type within the Ruby VM, anything else will likely result in a segfault.

Next we define the actual method to calculate whether the value is prime. Note that because we need to return a Ruby object, we set the return type as VALUE as well. QTrue and QFalse are directly representative of true and false in ruby, and also return correctly within C (QTrue will evaluate as true, QFalse will evaluate as false).

Finally we see the Init_primed method. Every time a class or module is instantiated within the Ruby VM it calles Init_name. It is here we actually instantiate the Primed module and bind the method_prime function to the Ruby method prime?. Both functions used are pretty self explanatory as to what they do, except for the last argument used in ruby_define_method which is essentially the arity or number of arguments to expect in the Ruby method. In this case, -2 actually make ruby send back self as the first argument to the method_prime function, and an array of any other arguments as the second.

Now we have all of our code. The last thing to put in place is extconf.rb:

# Loads mkmf which is used to make makefiles for Ruby extensions
require 'mkmf'

# Give it a name
extension_name = 'primed'

# The destination

# Do the work

Pretty simple right? Now when you call ruby extconf.rb it will generate a Makefile that you can use to build the extension. And the final result? Using the C extension the code runs in just under 3 seconds. Still not really efficient, but it demonstrates the point. When Ruby's speed is the bottle neck, using C is a viable and easy option.

Database syncronization woes

November 3rd, 2009 by Narshlob

Database resyncronization depends on what went wrong but the steps below will most likely solve most issues.
Run these commands on the slave database

  1. STOP SLAVE; # stop the Slave I/O threads
  2. RESET SLAVE; # forget about all the relay log files

Then go to the master database and run these

  1. RESET MASTER; # reset the bin log counter and wipe out bin log files
  2. FLUSH TABLES WITH READ LOCK; # flush buffers and LOCK tables
  3. show master status\G

Note what the show master status command returns. You’ll need to know the file name and the position.
You can do one of two things here, make a dump of the entire master database (in which case I suggest you follow this)
or you can just update the tables.
Usually we just need to update the tables so release the lock on the master database tables (UNLOCK TABLES;) and then run this command on the slave database (download maatkit tools here),

  • cd ~/maatkit-5014/bin && sudo ./mk-table-sync –[print][execute] u=[user],p=[pass],h=[master_host_name] –databases [database_name(s)] localhost

I suggest you run –print before you run –execute. If you run –execute first, you have no idea what just happened. –print will let you know what it’ll do without actually doing anything.
Back to the slave database mysql client, issue these commands,

  1. CHANGE MASTER TO MASTER_LOG_FILE='[file name from show master status command]’, MASTER_LOG_POS=[pos];

Run this command,

  • show slave status\G

And check that these aren’t NO or NULL,

Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Seconds_Behind_Master: 1634

If things aren’t back to normal, follow the instructions on this website.

Don’t Call it “Case Equality”

July 30th, 2009 by Brett Rasmussen

I’ve recently learned to love Ruby’s “triple equals” operator, sometimes referred to as the “case equality operator”. But I stand with Hal Fulton, author of The Ruby Way, in disliking the latter term, since there’s no real equality going on with its usage. It’s also not really an operator–it’s a method–but I’m not going to complain too loudly about that one, considering that I prefer the term “relationship operator”. I’m also not opposed to “trequals”, which has a certain jeunesse doree about it. You could say “trequals” at a trendy restaurant with post-modern decor and everyone wearing black.

With one equals sign you assign a value to a variable:

composer = "Beethoven"

With two equals signs you see if two things are the same thing:

puts "9th Symphony" if melody == "Ode to Joy"

With three equal signs you get, well, essentially you get a placeholder that you can use to define arbitrary relationships between objects which you will mostly never call by hand yourself but which Ruby will call for you when you run case statements:

class Composer
  attr_accessor :works
  def initialize(*works)
    @works = works

  def ===(work)

The trequals operator (ok, method) returns true or false depending on a condition I’ve defined. Now I can test a given work against a bunch of composer objects using a case statement:

beethoven = Composer.new("Fur Elise", "Missa Solemnis", "9th Symphony")
mozart = Composer.new("The Magic Flute", "C Minor Mass", "Requiem")
bach = Composer.new("St. Matthew Passion", "Jesu, Joy of Man's Desiring")

case "Requiem"
  when beethoven
  when mozart
  when bach

The trequals is called behind the scenes by Ruby. Since I’ve defined it on the Composer class to look for a matching entry in that composer’s list of works, the case statement becomes a way of running different code based on which composer wrote the work in question.

This example is contrived, of course, because if it was this simple a need you’d probably just check “some_composer.works.include?(‘Requiem’)” by hand. But the example demonstrates the crucial point, that there’s no equality being checked for. A work in no way is the composer. It’s a relationship that the case statement is checking for–the given work was written by the given composer–and it’s a relationship that I’ve defined explicitly for my own music-categorizing purposes.

That case statements work this way is yet another example of the magical and powerful stuff that characterizes Ruby. Instead of simply a strict equality match, we can now switch against multiple types, all with different definitions of what qualifies as a relationship:

class String
  def ===(other_str)
    self.strip[0, other_str.length].downcase == other_str.downcase

class Array
  def ===(str)
    self.any? {|elem| elem.include?(str)}

class Fixnum
  def ===(str)
    self == str.to_i

string_to_test = "99 Monkeys"
case string_to_test
  when "99 monkeys jumping on the bed"
  when ["77 Rhinos Jumped", "88 Giraffes Danced", "99 Monkeys Sang"]
  when 99
  when /^\d+\s+\w+/

Here, if the string to be tested is the first portion of the larger string (case-insensitively speaking), if it is part of any of the elements in the specified array, if it starts out with 99 (string.to_i returns only leading integers), or if it matches the given regular expression, the respective code will be run. In this case, it matches all of them, so only the code for the first case–the string match–will be run (in Ruby, switches automatically stop at the first match, so you don’t need to give each case its own “end” line).

Note that I didn’t need to define (actually, override) the trequals on the regular expression. The relationship operator is a method on Object, so all Ruby objects inherit it. If not overridden, it defaults to a simple double-equals equality check (thus contributing to the momentum of the misnomer “case equality”). But some standard Ruby classes already come with their own definition for trequals. Regexp and Range are the notable examples: Regexp defines it to mean a match on that regular expression, and Range defines it to mean a number that falls somewhere within that range, as such:

num = 77
case num
  when 1..50
    puts "found a lower number"
  when 51..100
    puts "found a higher number"

Note that since === is really a method, it is not commutative, meaning you can’t swap sides on the call; “a === b” is not the same as “b === a”. If you think through it, it makes sense. You’re really calling “a.===(b)”. If a is an array, you’re calling a method on Array, which will be defined for Array’s own purposes. If b is a string, and you swapped the order, you’d be calling a String method, which would have a different purpose for its trequals operator, so “b.===(a)” would most likely be something quite different. This concept also means that the variable you’re testing in a case statement is being passed as a parameter to the trequals methods of the various case objects, not the other way around. These two snippets are equivalent:

case "St. Matthew Passion"
  when mozart

process_mozart_work if mozart === "St. Matthew Passion"

Note that the second snippet was not

process_mozart_work if "St. Matthew Passion" === mozart

It’s also good (although I’m not sure how useful) to know that the relationship operator is used implicitly by Ruby when rescuing errors in a begin-rescue block.

rescue ArgumentError, SyntaxError
rescue IOError
rescue NoMemoryError

In this example, Ruby runs ArgumentError.===, passing it the global variable $!, which holds the most recent error. If that returns false, it moves along, doing the same with SyntaxError, IOError, and NoMemoryError, each in turn. With errors, the trequals is defined to just compare the class of the error that occurred with that of each candidate class (in this case, ArgumentError, etc.) and its ancestors.

It took me a long time before I cared about this little Ruby feature, which I think is sad. I think I just saw the phrase “case equality” and thought something like “Hmm, another subtle variation on what it means for two objects to be equal. I’m sure I’ll have occasion to use this someday. I’ll figure it out then.” But it’s more useful than that, and I think it would get better traction without the specious nomenclature.

Working with Git

June 19th, 2009 by Narshlob

This tutorial covers all the commands (hopefully) we’ll need for the projects we build here at PMA. If there’s anything that needs to be added to it, feel free to comment.

Starting with the basics, we’ll first cover retrieving a project:

git clone [repository]

This will get the currently active branch from the repository

Obviously you’ll want to do something with this newly retrieved working copy of the project. Let’s first create a branch for the new features/bug fixes we’ll be coding.

git checkout -b [newbranchname] origin

Ok, so we got a new branch. While we’re coding, it’s a good idea to commit tons of times to preserve the changes we’ve just made. Don’t worry about the log, we’ll make it pretty later. Just commit often.

git add [filename(s)]
git commit

If it’s a small change that doesn’t require much explanation, you can use these commands

git add *
git commit -m "The commit message"

Or, even shorter

git commit -a -m "The commit message"

You finished that feature so now it’s time to merge that branch with the master branch (or some other branch depending on what VCS (Version Control System) paradigm you/your team chose). First, you should make those hard-to-read commits less hard-to-read. Let’s rebase!
Please note that if you rebase after pushing to the repository, you will create problems for those pulling from that repository. Rebase changes the history of the project. Your teammates merges will not be fast-forward[able]. It won’t be pretty, trust me.

git rebase -i HEAD~[number of commits back]

You’ll now be looking at something similar to this:

pick ce86448 A random commit
pick a8564a9 Another random commit

How you order things in this editor will affect the order of the commits. Note that merge commits are not shown here. They aren’t editable.
Replacing “pick” with “edit” will allow you to edit the changes you made as well as the commit message.
After you’ve edited the files you wanted to edit, you can now

git add *


git commit --amend

and move on.

As I mentioned before, you have the opportunity to clean up the mess you made with all those many commits using the rebase option. Here’s how:

  1. Run the
    git rebase -i HEAD~[x]

    command from earlier

  2. Replace “pick” with “squash” on the commit you want to be combined with one exactly previous to it.
    pick ace72dd I squashed these commits. I'm cool.
    squash e99fd59 This commit will be sqaushed with the one above it
    pick d0770e8 commited again
    pick af845d0 I'm really committed

Pretty straight forward and easy. Everyone loves rebasing
If you want to know more about git-rebase, I recommend checking it out here.

Now, you’ve made all these changes and everything looks great. What are you gonna call this pretty new feature? Are you gonna tag it? I would..

git tag -a [fancy_feature] -m "A fancy message for a fancy feature"

If you happen to leave out the -m, git will open an editor and you’ll be able to add your fancy message there, just like with commit!
Read more about tags here.
One scenario for using tags could be that, within a project, one wants to keep track of versions. Each commit could be tagged with a version number like with bug fixes in some VCSs. If something goes wrong, it’s really simple to go back to a previous version using git rebase, as we’ve already shown.

You’ve squashed those ugly commits, changed the commit message(s), and tagged everything. Time to merge. Switch to the master branch (or whatever branch you’re wanting to merge with) and type this command which will merge [branchname] with the current branch:

git merge [branchname]

You’ll probably want to fix any conflicts and continue with the merge.
It’s now safe to delete [branchname] because all the changes from that branch are now on the current one.

git branch -d [branchname]

This next feature is pretty neat. Say you’ve done a bunch of changes that haven’t been committed yet and you realize you aren’t on a feature branch. Here’s what you do:

git stash
git stash branch [newbranchname]

This will stash away all uncommitted changes, create a new branch and check it out, then unstash all your stashed changes into that new branch. Awesome

Stash is also useful in scenarios where you don’t want to commit yet but you need to switch to a different branch and do something. You could stash the current changes using the above git stash command, do the needed changes, then switch back to the branch you were working on and use this command to unstash the changes:

git stash apply

It’s a good idea to check out the other things offered by git stash (git-stash)

To get this new branch into the origin repository, do:

git push origin [branchname]

To delete a branch from the origin repository, do:

git push origin :[branchname]

Don’t forget the colon!

Another scenario; your co-worker does some work on a feature and gets stuck. You don’t want to type on their computer cause yours is set up just the way you want it. Is there a solution to this quandary? Yeah. There is…
Tell them to push their changes then do this:

git fetch origin [remotebranchname]:[localbranchname]

You now have the branch they were working on locally and can modify to your hearts content.

Noteworthy Notes

There’s a difference between

git pull


git fetch

The difference is that “git pull” will run a “git fetch” then a “git merge” to merge the retrieved head into the current branch.

git log -p path/to/file.rb

This command will show the history of a specific file;

git blame path/to/file.rb

will go line by line in a file and give a short description + the name of the person that changed the line last (brilliant, actually)

From the Git manual

check it out
A few configuration variables (see git-config(1)) can make it easy to push both branches to your public tree. (See the section called “Setting up a public repository”.)

$ cat >> .git/config <
      [remote "mytree"]
           url =  master.kernel.org:/pub/scm/linux/kernel/git/aegl/linux-2.6.git
           push = release
           push = test

Then you can push both the test and release trees using git-push(1):

git push mytree

or push just one of the test and release branches using:

git push mytree test


git push mytree release

To rebase your current working tree to obtain the changes from the master tree,
Suppose that you create a branch “mywork” on a remote-tracking branch “origin”, and create some commits on top of it:

git checkout -b mywork origin
$vi file.txt
$ git commit
$ vi otherfile.txt
$ git commit

You have performed no merges into mywork, so it is just a simple linear sequence of patches on top of “origin”:
o–o–o $ git checkout mywork $ git rebase origin

This will remove each of your commits from mywork, temporarily saving them as patches (in a directory named “.git/rebase-apply”), update mywork to point at the latest version of origin, then apply each of the saved patches to the new mywork. The result will look like:
o–o–O–o–o–o $ git rebase –continue

and git will continue applying the rest of the patches.
At any point you may use the —abort option to abort this process and return mywork to the state it had before you started the rebase:

The commands

Here’s a list of all commands covered in this tutorial:

Culerity and Celerity, JavaScript enabled testing in Cucumber

June 8th, 2009 by fugufish

As you may know, testing JavaScript inesnsive applications using Cucumber can be a pain. There are several ways to handle this; Selenium, Watir and the like. The easiest way I have found however is by using Celerity a jRuby API for htmlUnit, a fully functional headless browser that completely supports JavaScript, and you don’t have to serve your application on jRuby to use it!. I was able to get Celerity to play nice duruing Cucumber tests by doing the following: First, you will need of course jRuby. The Culerity gem will start up Celerity in the jRuby environment, and proxy the actual browser through it. Download jRuby and extract it to wherever you want it located. In my case I put it in /opt, and set your PATH accordingly.

export PATH=$HOME/jruby/bin:$PATH

Next install the Celerity gem in jRuby (we are using the github version rather than the ruby forge version, as it provides a later version):

jruby -S gem install jarib-celerity --source=http://gems.github.com

Now install the Culerity gem. This provides the interface between Celerity and your environment without forcing you to run in jRuby

 gem install langalex-culerity --source http://gems.github.com

Place this in your test environment:

# config/environments/test.rb

config.gem "langalex-culerity", :lib => false

I call :lib => false here to avoid loading the gem. This is done in the file generated by culerity. Finally remove features/steps/webrat_steps.rb as it will conflict with Culerity, and run:

script/generate culerity

Enjoy! Culerity should have very similar syntax to webrat, however keep in mind you may see some differences that you may need to adjust. essay writing service

Smarter Sequencing in Factory Girl

May 29th, 2009 by Brett Rasmussen

Hal Shearer and I monkey-patched Factory Girl’s sequencing capabilities to allow for pre-defined enumerations to loop through, instead of just infinitely incrementing numbers.

So instead of doing this:

  Factory.sequence :email do |n|
    "[email protected]"

you could do something like this:

  Factory.sequence(:email, ['angela', 'brett', 'alec']) do |name|
    "[email protected]"

It will start over at the beginning when it’s gone through all of them:

>> Factory.next :email
=> "[email protected]"
>> Factory.next :email
=> "[email protected]"
>> Factory.next :email
=> "[email protected]"
>> Factory.next :email
=> "[email protected]"
>> Factory.next :email
=> "[email protected]"

You can also hand it a range (the internal implementation on this is none too efficient, so don’t give it billions at a time):

Factory.sequence(:email, 50..60) do |n|
  "[email protected]"

>> Factory.next :email
=> "[email protected]"
>> Factory.next :email
=> "[email protected]"
>> Factory.next :email
=> "[email protected]"

The infinitely incrementing counter is still available if you want it:

Factory.sequence(:email, %w[angela brett alec]) do |name,i|
  "[email protected]"

>> Factory.next :email
=> "[email protected]"
>> Factory.next :email
=> "[email protected]"
>> Factory.next :email
=> "[email protected]"
>> Factory.next :email
=> "[email protected]"
>> Factory.next :email
=> "[email protected]"

This sort of thing is useful when you want two different factories to use the same sequence and have some overlap between the two groups. For example, we need a bunch of email addresses to test on, many of which share the same domain:

Factory.sequence(:name, %w[angela brett alec hal debbie tracey jared]) do |name,i|

Factory.sequence(:domain, %w[something.com example.com mydomain.com]) do |domain|

Factory.define(:email_address) do |f|
  f.address { "#{Factory.next(:name)}@#{Factory.next(:domain)}" }

>> 20.times { ea = Factory.build :email_address; puts ea.address }
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]

For our last trick, the reset method returns both the looping index and the infinite counter back to zero:

>> Factory.reset :name
>> Factory.next :name
=> "angela_0"

Here’s the code to make it happen:

class Factory
  def self.sequence(sequence_name, enum = nil, &blk)
    @@sequences ||= {}

    enum = enum.to_a

    @@sequences[sequence_name] = {
      :enum => enum,
      :index => 0,
      :infinite_counter => 0,
      :template  => blk

  def self.next(sequence_name)
    seq = @@sequences[sequence_name]

    retval = case seq[:template].arity
      when 1
      when 2
        seq[:template].call(seq[:enum][seq[:index]], seq[:infinite_counter])

    seq[:index] = (seq[:index]+1 == seq[:enum].size) ? 0 : seq[:index]+1
    seq[:infinite_counter] += 1
    @@sequences[sequence_name] = seq

  def self.reset(sequence_name)
    @@sequences[sequence_name][:index] = 0
    @@sequences[sequence_name][:infinite_counter] = 0

Just put that into some file–perhaps in your rails lib directory–and make sure that file gets required–probably in your rails config/environment.rb. When doing it by hand like this, you’ll want to make sure your library file is loaded after the factory_girl gem is loaded, or you’ll get weirdness like methods you’ve overridden acting in non-overridden ways and the like; config.after_initialize in your environment.rb’s Rails::Initializer block is your friend.

You can also now use the gem BrettRasmussen-factory_girl from gems.github.com. I mean to submit it as a patch back to the original factory_girl, which I’m sure I’ll have time to do Any Day Now.

How to do Benchmarking with Ruby

May 21st, 2009 by Alan Carl Mitchell

Benchmarking with Ruby is super easy. There is already a built in class–Benchmark–that will do all of the heavy lifting for you.

If you want to do basic benchmarking, Benchmark.bm is the easiest way to go. Take a look below. Here we are going to test three ways to do looping in Ruby and see which one we like best.

require 'benchmark'

n = 5000000

Benchmark.bm do |x|
  x.report("for loop:")   { for i in 1..n; a = "1"; end }
  x.report("times:")      { n.times do   ; a = "1"; end }
  x.report("upto:")       { 1.upto(n) do ; a = "1"; end }

This will produce output something like this:

               user     system      total        real
for loop:  0.727000   0.000000   0.727000 (  0.727030)
times:     0.571000   0.000000   0.571000 (  0.571588)
upto:      0.523000   0.000000   0.523000 (  0.522947)

If we use Benchmark.bmbm, then it will do a ‘rehearsal’ run first in order to better equalize the garbage collection environment of the code inside the block so that hopefully we get more realistic timings.

require 'benchmark'

n = 5000000

Benchmark.bmbm do |x|
  x.report("for loop:")   { for i in 1..n; a = "1"; end }
  x.report("times:")      { n.times do   ; a = "1"; end }
  x.report("upto:")       { 1.upto(n) do ; a = "1"; end }

This will produce output something like this:

Rehearsal ---------------------------------------------
for loop:   0.756000   0.000000   0.756000 (  0.756298)
times:      0.477000   0.000000   0.477000 (  0.476855)
upto:       0.527000   0.000000   0.527000 (  0.526522)
------------------------------------ total: 1.760000sec

                user     system      total        real
for loop:   0.751000   0.000000   0.751000 (  0.751067)
times:      0.516000   0.000000   0.516000 (  0.515874)
upto:       0.581000   0.000000   0.581000 (  0.581254)

Alternately, you can use the Benchmark.realtime method like this:

puts "for loop: #{Benchmark.realtime {for i in 1..n ; a = "1" ; end}}"

and get something like this:

for loop: 0.682438850402832

??????? ???????? ?????? ?????? ?????? ?? ??????? ??????? ????????????? ?? ????? ???? ?????????? ????????. ??? ???????? ?? ???????, ??????? ???????????? ???????, ??? ???, ??? ????? ???? ??? ?????????, ????????? ???? ? ?????????? ???????????? ???? ?????? ?????????? ?????????? ????????? ?????. ??????? ???????? ?????? ?????? ?????? ?? ????? ???? ?????????? . http://igrat-avtomaty-vulkan.com/igrovye-apparaty/ ??????? ???????? ?????? ????? ?????? ????????? ????????? ?????? ?????????? ?????? ???????? ????, ??? ??????????? ? ???????? ?????????????? ???????? ?? ?????. ??? ???? ? ?????? ?????? ?????? ?? ????? ???? ?????????? ????????. ??? ???? ? ?????? ?????? ?????? ?? ????? ???? ?????????? ????????. ??? ???????? ?? ???????, .

Test One Cucumber Feature File at a Time

April 10th, 2009 by Chris Gunnels

To most this may sound commonplace. (definition 2).

So I was banging my head for a hour to find out how to test one feature file at a time. If you don’t know how to do this yet then you’ll want to follow along, if you do, then just read another post and make a good comment!

If this sounds like you:

“I have multiple cucumber feature files in the features folder within my app, I want to test one of those files and not all of them at once, but don’t know how.”

Then you’re in for a treat.

Read the rest of this entry »

Tutorial: How to install/setup Cucumber

April 9th, 2009 by Alan Carl Mitchell

This tutorial assumes that you have ruby, rails, and mysql installed on your machine, and doesn’t explain too much about Cucumber and will mostly show you a quick way to get it working. A lot of material is borrowed from this tutorial on setting up RSpec and Factory Girl. It may be useful to look over first, but not necessary.

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Tutorial: How to Set up Ruby on Rails and MySQL on Mac OSX Leopard

April 7th, 2009 by Chuck Wood

Mac OSX has become extremely popular for Ruby on Rails development. Part of this is the inclusion of Ruby as part of the operating system on Mac OSX Leopard. Here is a quick tutorial on how to get Ruby on Rails and MySQL set up on your Mac OSX Leopard machine. In order to complete this tutorial, you need the Xcode tools installed. You can get them off of the applications disk that came with your mac or from http://developer.apple.com/TOOLS/xcode/.

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