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Partial decomposition is a tool that I've found useful across a range of applications It's simple, it's easy to build in a "componentized" fashion, and it powerfully combines the best of XML with the best of SQL At this point, we've covered the XML application development life cycle from requirements definition, through data modeling, XML design, and database schema design The next step is to build your application actually to write application code in your platform of choice, be that Perl, Java, VisualBasic, object-oriented Fortran, or whatever The building of your application is beyond the scope of this book, although we'll discuss some aspects of it in s 8 and 9 With a foundation built on the topics we've covered thus far, however, the task of writing your application will be much easier

Micropostnew(:content => "foo bar", :user_id => 17)

Naturally, we simply must begin with the canonical HelloWorld program While it won t exactly enhance our skills as Java coders, it does provide a nice vehicle for describing the application development process in a step-by-step fashion Typically, to develop and test your application requires these ve steps 1 2 3 4 5 Create the source le Compile the source le Convert the class le Load the converted image Run the converted image

The attr_accessible declaration in Listing 112 is necessary for site security, but it introduces a problem in the default Micropost model spec (Listing 113)

require 'spec_helper' describe Micropost do before(:each) do @attr = { :content => "value for content", :user_id => 1 } end it "should create a new instance given valid attributes" do Micropostcreate!(@attr) end end

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The remainder of this section will detail all ve steps We ll recycle this experience for the remaining examples, allowing us to focus on other details For the sake of becoming familiar with the development process, we ll perform all of these steps manually Since this quickly becomes tedious for real-world application development, the process of building and loading applications should be automated using a reasonable combination of make les and shell scripts (batch le in Windows lingo) Step 1: Create the source le Create and save a le named containing the source code in Listing 21

In the next chapters, we'll discuss some other XML standards that can be powerful tools when developing XML applications, and we'll discuss two frameworks (Sun's Java 2 Enterprise Edition and Microsoft's SQL Server 2000) for building those applications Finally, we'll cover some further examples of how to integrate SQL and XML Throughout, we'll be applying the principals discussed here and in the previous chapters, such as partial decomposition

This test currently passes, but there s something fishy about it (See if you can figure out what before proceeding) The problem is that the before(:each) block in Listing 113 assigns the user id through mass assignment, which is exactly what attr_accessible is designed to prevent; in particular, as noted above, the :user_id => 1 part of the initialization hash is simply ignored The solution is to avoid using Micropostnew directly; instead, we will create the new micropost through its association with the User model, which sets the user id automatically Accomplishing this is the task of the next section

2

The goal of this section is to establish an association between the Micropost model and the User model a relationship seen briefly in Section 233 and shown schematically in Figure 112 and Figure 113 Along the way, we ll write tests for the Micropost model that, unlike Listing 113, are compatible with the use of attr_accessible in Listing 112 We start with tests for the Micropost model association First, we want to replicate the Micropostcreate! test shown in Listing 113 without the invalid mass assignment Second, we see from Figure 112 that a micropost object should have a user method

In some cases, the controller will immediately render a view, which is a template that gets converted to HTML and sent back to the browser More commonly for dynamic sites, the controller interacts with a model, which is a Ruby object that represents an element of the site (such as a user) and is in charge of communicating with the database After invoking the model, the controller then renders the view and returns the complete web page to the browser as HTML If this discussion seems a bit abstract right now, worry not; we ll refer back to this section frequently In addition, Section 222 has a more detailed discussion of MVC in the context of the demo app Finally, the sample app will use all aspects of MVC; we ll cover controllers and views starting in Section 312, models starting in Section 61, and we ll see all three working together in Section 632

class HelloWorld { public static void main(String[] args) { Systemoutprintln("Hello World"); } }

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