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For obvious reasons, Array#clear always acts on the original array:

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Being able to capture our exercise results is a powerful thing but not as powerful as being able to display those results in an attractive line or bar graph so we can visually track our progress over time. Fortunately, we have a number of great options available to us for the creation of attractive graphs and reports. Each solution has its own particular strengths and weaknesses that make each suitable for different needs. In your typical application, you would probably never need more than one of these solutions, but in this chapter, we re going to experiment with loading several of the most popular solutions into our application so that you ll have a bit of experience with each. Of course, we first need to make sure that you have some data to graph. Since a few weeks have passed since I wrote the previous chapter, I ve added several weeks worth of data to the application. Unfortunately, this was during the holidays when sweets were plentiful and exercise wasn t. So to salvage a little dignity and not show off my holiday five, I ve created a sample SQLite 3 database preloaded with data that we ll be using in this chapter that you can obtain from the Source Code/Download link on the Apress web site. Just copy this database in your /db directory over your existing development database, and your application will be loaded with enough data for our needs.

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Listing 10-1. Home Page Controller (app/controllers/home_controller.rb)

presidents.clear(); presidents; //-> []

Save this as app/controllers/home_controller.rb. Next, create a controller for uploading Apache log files, as shown in Listing 10-2.

Two other methods winnow the contents of the array. Array#uniq takes its behavior and its odd name from the corresponding Ruby method it returns an array without any duplicate values:

Now that we have a database full of sample data to use, let s take a look at our options for creating graphs from our data. Many of these solutions will require that you have ImageMagick and its corresponding Ruby implementation library RMagick installed onto your development machine. See the Installing RMagick sidebar for tips on how to add it to your machine if you re missing it.

Listing 10-2. Log Controller (app/controllers/logs_controller.rb)

var presidents = ["Washington", "Adams", "Jefferson", "Madison", "Monroe", "Adams"]; presidents.uniq(); //-> ["Monroe", "Madison", "Jefferson", "Adams", "Washington"] [1, 2, 3, 3, 2, 3, 1, 3, 2].uniq(); //-> [1, 2, 3] Array#without accepts any number of arguments and returns a new array without the

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def webcomic unless read_fragment({}) @comic = Comic.find(params[:id]) end rescue @comic = Comic.find(:first, :order => 'id desc') end end Since we haven t yet modified our sweepers to clean up our fragment caches, we should clear out our existing cache by running rake tmp:cache:clear from the root of our application. Once any existing cached fragments are removed, we can retest our fragment caching by refreshing the home page again. We can monitor the logs to see that our request to the page produced the same results but now it also caches the fragment: Processing PublicController#index (for 127.0.0.1 at 2007-05-28 22:07:57) [GET] Session ID: 06304d6bb8a857c0084d7702ce11b6a8 Parameters: {"action"=>"index", "controller"=>"public"} Fragment read: localhost:3000/ (0.00013) Comic Load (0.000522) SELECT * FROM comics ORDER BY id desc LIMIT 1 Rendering layoutfalsetemplatepublic/webcomic within layouts/application Rendering public/webcomic Fragment read: localhost:3000/ (0.00015) SQL (0.000250) SELECT count(*) AS count_all FROM comics Cached fragment: localhost:3000/ (0.00054) Completed in 0.00971 (103 reqs/sec) | Rendering: 0.00505 (51%) | DB: 0.00077 (7%) | 200 OK [http://localhost/] Now, if we refresh the page again, we should no longer see any requests to the database in our logs, as the read_fragment method detects the existing cache and prevents any unnecessary database hits: Processing PublicController#index (for 127.0.0.1 at 2007-05-28 22:08:05) [GET] Session ID: 06304d6bb8a857c0084d7702ce11b6a8 Parameters: {"action"=>"index", "controller"=>"public"} Fragment read: localhost:3000/ (0.00012) Rendering layoutfalsetemplatepublic/webcomic within layouts/application Rendering public/webcomic Fragment read: localhost:3000/ (0.00013) Completed in 0.00290 (345 reqs/sec) | Rendering: 0.00128 (44%) | 200 OK [http://localhost/]

require 'benchmark' require 'tempfile' require 'ar-extensions' # Note that some developers would prefer to put the above # require statements in the config/environment.rb file.

specified values:

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