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You have a multitude of options to choose from when planning your production environment. Most often, the best strategy is to follow Ruby on Rails best practices and to concentrate on keeping the architecture simple. Running your application on LightTPD is a safe option, as it is used by many existing Ruby on Rails applications, and can be considered to be fairly simple to install and maintain. But LightTPD is by no means the only option. Apache (httpd.apache.org) might be a better option for some applications and platforms; for example, Basecamp (www.basecamphq.com) runs on Apache. Other alternatives include any web server that supports FastCGI or that can act as a proxy for Mongrel. Mongrel (mongrel.rubyforge.org), an alternative to using FastCGI, is a fast HTTP library and server that is slowly becoming the de facto standard for new Rails production deployments. With Mongrel, there s no need for FastCGI, because Mongrel itself talks HTTP and acts as a web server. This simplifies the deployment and maintenance of applications. Note that at the time of writing, the author of Mongrel, Zed Shaw, recommends using Apache, rather than LightTPD, with Mongrel, because of problems with its mod_proxy module. This will probably be fixed when the new mod_proxy_core module is released. See Coda Hale s blog post (http://blog.codahale.com/2006/06/19/time-for-a-grown-upserver-rails-mongrel-apache-capistrano-and-you/) for a write-up on Mongrel, and how to use it together with Apache and Capistrano. Ruby on Rails plays well with most of the popular database servers found on the market today, both open source and commercial. If you re looking for an open source database server similar to MySQL, we recommend PostgreSQL (www.postgresql.org).

Figure 9-11. Inside the Skin directory. This folder contains css files, images, and javascript files.

people = { 'Alice': { 'phone': '2341', 'addr': 'Foo drive 23' }, 'Beth': { 'phone': '9102', 'addr': 'Bar street 42' }, 'Cecil': { 'phone': '3158', 'addr': 'Baz avenue 90' } } # Descriptive labels for the phone number and address. These will be used # when printing the output. labels = { 'phone': 'phone number', 'addr': 'address' } name = raw_input('Name: ') # Are we looking for a phone number or an address request = raw_input('Phone number (p) or address (a) ') # Use the correct key: if request == 'p': key = 'phone' if request == 'a': key = 'addr' # Only try to print information if the name is a valid key in our dictionary: if name in people: print "%s's %s is %s." % (name, labels[key], people[name][key])

Installing the Database Server (MySQL)

Now that you have a basic understanding of where each of the different elements of a theme are contained, let s look at making a few quick changes to each one of these sections.

In 3, you saw how you could use string formatting to format all the values in a tuple. If you use a dictionary (with only strings as keys) instead of a tuple, you can make the string formatting even snazzier. After the % character in each conversion specifier, you add a key (enclosed in parentheses), which is followed by the other specifier elements:

In the case of Emporium, the database server is running a single instance of MySQL (http://www.mysql.com). MySQL is claimed to be the world s most popular open source database. It is a safe choice that is used by many high-traffic websites, including craigslist.com, which serves millions of classified ads a day from a MySQL cluster. The communication between Ruby on Rails and the database is done through a native MySQL database driver. You need to install MySQL and the MySQL driver (native) on the production server. We explained how to install these in 1.

When you are working with Magento themes, one of the best things you can do is to turn on template path hints. Template path hints allow you to easily identify file paths for each part of your Magento site. To turn on developer hints, login to your administrative interface and navigate to System Configuration. Once the configuration page loads, select your store from the drop downmenu from the list under Current Configuration Scope. Then, click on developer at the bottom of the page under Advance select Developer located in the bottom left, which will bring up the Developer configuration. Click on debug and make sure Template Path Hints is changed to Yes. Click Save Config in the upper right-hand corner. This one tip will save you many sleepless nights (see Figures 9-12 and 9-13).

>>> phonebook {'Beth': '9102', 'Alice': '2341', 'Cecil': '3258'} >>> "Cecil's phone number is %(Cecil)s." % phonebook "Cecil's phone number is 3258." Except for the added string key, the conversion specifiers work as before. When using dictionaries like this, you may have any number of conversion specifiers, as long as all the given keys are found in the dictionary. This sort of string formatting can be very useful in template systems (in this case using HTML): >>> template = '''<html> <head><title>%(title)s</title></head> <body> <h1>%(title)s</h1> <p>%(text)s</p> </body>''' >>> data = {'title': 'My Home Page', 'text': 'Welcome to my home page!'} >>> print template % data <html> <head><title>My Home Page</title></head> <body> <h1>My Home Page</h1> <p>Welcome to my home page!</p> </body>

def test_age p = Person.create(:first => 'George', :last => 'Pork', :dob => (Date.today - 35.years)) assert_equal 35, p.age end end