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does the trick in this case) The application code to get Listing 1111 to pass is less than one line; in fact, it s just an option to the has_many association method, as shown in Listing 1112

TINI /> ps 3 processes 1: Java GC (Owner root) 2: init (Owner root) 4: Blinkytini (Owner root)

For easy reference, I want to keep track of which ISBN numbers, are referred to from which documents; thus I design an SQL table to look something like this: doc_id 1 2 0987-2343 0872-8237 ISBN

Before leaving the Micropost model, we ll tie off a couple of loose ends by adding validations (following the example from Section 232) Both the user_id and content attributes are required, and content is further constrained to be shorter than 140 characters, which we test for using the code in Listing 1113

The ps command shows us the total number of processes and lists each process id followed by its name Now let s kill Blinky, since the thrill of a blinking light is probably starting to wane

require 'spec_helper' describe Micropost do before(:each) do @user = Factory(:user) @attr = { :content => "value for content" } end describe "validations" do it "should require a user id" do Micropostnew(@attr)should_not be_valid end it "should require nonblank content" do @usermicropostsbuild(:content => " ")should_not be_valid end it "should reject long content" do @usermicropostsbuild(:content => "a" * 141)should_not be_valid end end end

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These generally follow the examples from the User model validation tests from Section 62 (The analogous tests were broken into multiple lines in that section, but you should be comfortable enough reading RSpec code by now to digest the more compact formulation above) As in Section 62, the code in Listing 1113 uses string multiplication to test the micropost length validation:

TINI /> kill 4 TINI /> ps 2 processes 1: Java GC (Owner root) 2: init (Owner root)

referential integrity to a list of valid ISBN numbers "Great," I hear you saying, "this is a lot of complexity for a bunch of stupid book names Explain to me why this is better than using HTML again" Suppose I have a thousand documents (book reviews, articles, bulletin board messages, and so on), and I want to determine which of them refer to a specific book In the HTML universe, I can perform a textual search for occurrences of the book name But what if I have documents that refer to Homer's Odyssey and Arthur C Clark's 2001: A Space Odyssey If I search for the word "odyssey," my search results list both books However, if I've marked up all my references to books by ISBN and I've decomposed or extracted this information into a table in a database, I can use a simple SQL query to get the information I need quickly and reliably:

$ rails console >> "a" * 10 => "aaaaaaaaaa" >> "a" * 141 => "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"

After killing process 4 and examining the process list, we see that the process count has gone from three to two, and only the background garbage collector and command shell (Notice that the rst Java process started during the bootup phase Slush in this case is always named init ) are running Even if you kill and immediately restart the same process, it will not get the same process id Process ids are always incrementing and are not recycled So, if you were to run Blinky again and do a ps, the process id would be 5 The process id is an unsigned 16-bit value and therefore rolls to the lowest available value after 65535

Usernew()

Finally, we ll upgrade the HelloWorld example, taking it to the World Wide Web The HelloWeb program, shown in Listing 23, is a very small Web server The built-in HTTPServer class, provided in the comdalsemitininethttp package, does the bulk of the work HelloWeb creates an instance of HTTPServer that listens for client HTTP requests on server port 80 It also logs all requests to a le named weblog in the /log directory The main loop simply spins forever, invoking the serviceRequests method on the HTTPServer instance Listing 23 HelloWeb

the code in Listing 1113 uses the build method:

select doc_id from doc_isbn where isbn = '0987-2343'

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