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The after_initialize callback is invoked whenever a new Active Record model is instantiated (either from scratch or from the database) Having it available prevents you from having to muck around with overriding the actual initialize method The after_find callback is invoked whenever Active Record loads a model object from the database, and is actually called before after_initialize, if both are implemented Because after_find and after_initialize are called for each object found and instantiated by finders, performance constraints dictate that they can only be added as methods, and not via the callback macros What if you want to run some code only the first time that a model is ever instantiated, and not after each database load There is no native callback for that scenario, but you can do it using the after_initialize callback Just add a condition that checks to see if it is a new record:

In a number of Rails apps that I ve written, I ve found it useful to capture user preferences in a serialized hash associated with the User object The serialize feature of Active Record models makes this possible, since it transparently persists Ruby object graphs to a text column in the database Unfortunately, you can t pass it a default value, so I have to set one myself:

import javaxannotationResource; import javaxsqlDataSource; public class LoanApplicationJDBCDao implements LoanApplicationDao { private DataSource loanDS; @Resource (name = "loanDB") public void setDataSource(DataSource dataSource) { loanDS = dataSource; } }

1 Select Code Quality Issues on the left of the AuditGuide (see Figure 1417)

class User < ActiveRecord::Base serialize :preferences # defaults to nil protected def after_initialize selfpreferences ||= Hashnew end end

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Using the after_initialize callback, I can automatically populate the preferences attribute of my user model with an empty hash, so that I never have to worry about it being nil when I access it with code such as userpreferences[:show_help_text] = false Ruby s metaprogramming capabilities combined with the ability to run code whenever a model is loaded using the after_find callback are a powerful mix Since we re not done learning about callbacks yet, we ll come back to uses of after_find later on in the chapter, in the section Modifying Active Record Classes at Runtime

The RSpec Rails gem provides four different contexts for specs, corresponding to the four major kinds of objects you write in Rails Along with the API support you need to write Rails specs, it also provides code generators and a bundle of Rake tasks

2 Select the Suppress Code Quality Issues radio button 3 Click OK to suppress code quality issues, and click OK again to confirm your choice 4 Select Show Suppressed Items from the Options menu to see which results were suppressed Figure 1418 shows the results

Assuming you have the rspec-rails gem bundled already, you should run the rspec:install generator provided to set up your project for use with RSpec

In the preceding example, the name attribute speci ed on the @Resource annotation instructs the SCA runtime to inject the DataSource named "loanDB" This DataSource is con gured in a runtime-speci c manner

$ rails generate rspec:install create rspec create spec create spec/spec_helperrb create autotest create autotest/discoverrb

1 Select Manage Rulepacks from the Tools menu 2 Select the Medium security level (see Figure 1419) and click Apply

RSpec and Rake The lib/tasks/rspecrake script sets the default Rake task to run all specs in your /spec directory tree It also creates specific rake spec tasks for each of the usual spec directories

$ rake -T spec rake spec rake rake rake rake rake rake rake rake rake spec:controllers spec:helpers spec:lib spec:mailers spec:models spec:rcov spec:requests spec:routing spec:views # Run all specs) # Run the # Run the # Run the # Run the # Run the # Run all # Run the # Run the # Run the specs in spec directory (excluding plugin code examples in code examples in code examples in code examples in code examples in specs with rcov code examples in code examples in code examples in spec/controllers spec/helpers spec/lib spec/mailers spec/models spec/requests spec/routing spec/views

Notice that a large number of issues have disappeared Security levels enable you to simulate the results of running an analysis with only a subset of rules tuned, to produce results that strike a balance between reporting every possible issue and finding only the most serious issues that can be detected with the highest level of accuracy If you are continuing on to the next exercise, leave Audit Workbench open

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