Crafting Rails Applications: Expert Practices for Everyday by José Valim

By José Valim

Rails center developer Jose Valim publications you thru seven diverse tutorials, each one of them utilizing test-driven improvement to construct a brand new Rails extension or program that solves universal issues of those new APIs. you are going to know the way the Rails rendering stack works and customise it to learn templates from the database if you the best way to mimic lively list habit, like validations, in the other item. you'll find out the way to write speedier, leaner controllers, and you'll how to combine Sinatra purposes into your Rails apps, so that you can decide upon the main acceptable device for the activity. additionally, you'll enhance your productiveness through customizing turbines and responders.

This booklet may also help you know Rails 3's internal workings, together with turbines, template handlers, internationalization, routing, and responders. With the data you'll achieve, you'll have the ability to take on advanced initiatives extra simply than ever sooner than, growing options which are well-tested, modular, and simple to maintain.

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It returns a hash with the attribute names as keys and their respective values. Implementing it in our model requires two steps: first we need to track all attributes defined by the developer, and then we need to use them to create an attributes hash. present? end end end To allow our MailForm::Base to be inheritable, our implementation uses the class_attribute method from Active Support to define the array that holds our attributes list. The class_attribute implementation ensures a child class has the same values as the parent but guarantees that setting a value in the child won’t propagate to the parent.

Boolean :partial, :default => false And now we are ready to run our migrations: rake db:migrate So far, no surprises. Next, let’s create a template resolver, which will use the SqlTemplate model to read templates from the database and expose them according to the Resolver API described next. The Resolver API The Resolver API is composed of a single method, called find_all, which should return an array of templates and has the following signature: def find_all(name, prefix, partial, details, cache_key) For an HTML request at the index action of a UsersController, those arguments are exactly as shown here: find_all("index", "users", false, { :formats => [:html], :locale => [:en, :en], :handlers => [:erb, :builder, :rjs] }, nil) For this simple request, we can see that name maps to the action name, while prefix refers to the controller name.

With autoload in place, our first test passes. We have a simple model with attributes, but so far, we haven’t used Active Model’s goodness. Let’s do that now. Adding Attribute Methods ActiveModel::AttributeMethods is a module that tracks all defined attri- butes, allowing us to add a common behavior to all of them. Let’s use it to dynamically define clear_ methods for all attributes. If our fixture has both name and email attributes, we can use ActiveModel::AttributeMethods to define clear_name and clear_email without duplicating code.

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