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Two columns with left bar: Page content is displayed on the right and a sidebar column is displayed on the left. Three columns: This layout displays the page content in the middle with sidebar column on both the left and right-hand side.

On the second line, memcached checks whether book number 15 exists in the cache. It doesn t, so on the fourth line, it caches the object and confirms this by outputting STORED. When the page is requested again, the book (as well as the shopping cart fragment) is found from the cache. cached_model expires the cached model objects automatically every 15 minutes (you can adjust this by setting CachedModel.ttl). Since it s tightly integrated with ActiveRecord, expiring objects when they are updated is taken care of automatically.

You can use the dict function to construct dictionaries from other mappings (for example, other dictionaries) or from sequences of (key, value) pairs: >>> items = [('name', 'Gumby'), ('age', 42)] >>> d = dict(items) >>> d {'age': 42, 'name': 'Gumby'} >>> d['name'] 'Gumby' It can also be used with keyword arguments, as follows: >>> d = dict(name='Gumby', age=42) >>> d {'age': 42, 'name': 'Gumby'} Although this is probably the most useful application of dict, you can also use it with a mapping argument to create a dictionary with the same items as the mapping. (If used without any arguments, it returns a new empty dictionary, just like other similar functions such as list, tuple, or str.) If the other mapping is a dictionary (which is, after all, the only built-in mapping type), you can use the dictionary method copy instead, as described later.

Figure 9-2. The empty default theme layout. The empty theme layout has no background and does not include the Magento header or footer. This layout is perfect for landing pages that are custom designed.

Tip For more information about cached_model and how to use memcache-client directly to cache arbitrary things like collections of objects (cached_model doesn t help if you use find(:all), for example), read Geoffrey Grosenbach s excellent tutorial memcached Basics for Rails at http://nubyonrails.com/ articles/2006/08/17/memcached-basics-for-rails.

Note The dict function isn t really a function at all. It is a type, just like list, tuple, and str.

Figure 9-3. The one column default theme layout. This layout is the most basic layout. It includes the Magento header and footer, but no left or right columns.

The performance of any web application can be severely crippled by small issues in the source code, and a Rails application is no different. Here, we ll look at some of the most common performance problems in Rails applications and how to avoid them.

Figure 9-4. The two column with left bar default theme layout. This layout features a left sidebar with the main page content displayed on the right.

The basic behavior of a dictionary in many ways mirrors that of a sequence: len(d) returns the number of items (key-value pairs) in d, d[k] returns the value associated with the key k, d[k] = v associates the value v with the key k, del d[k] deletes the item with key k, and k in d checks whether there is an item in d that has the key k. Although they share several common characteristics, there are some important distinctions: Dictionary keys don t have to be integers (though they may be). They may be any immutable type, such as floating-point (real) numbers, strings, or tuples. You can assign a value to a key even if that key isn t in the dictionary to begin with; a new item will be created. You cannot assign a value to an index outside the list s range (without using append or something like that).