Download Crafting Rails Applications: Expert Practices for Everyday by José Valim PDF

By José Valim

Rails middle developer Jose Valim publications you thru seven assorted tutorials, each one of them utilizing test-driven improvement to construct a brand new Rails extension or software that solves universal issues of those new APIs. you'll know how the Rails rendering stack works and customise it to learn templates from the database whenever you how you can mimic energetic checklist habit, like validations, in the other item. you can find out the right way to write swifter, leaner controllers, and you'll the way to combine Sinatra purposes into your Rails apps, so that you can select the main acceptable device for the activity. furthermore, you are going to increase your productiveness through customizing turbines and responders.

This booklet may also help you already know Rails 3's internal workings, together with turbines, template handlers, internationalization, routing, and responders. With the information you'll achieve, you'll have the ability to take on complex tasks extra simply than ever earlier than, developing ideas which are well-tested, modular, and straightforward to maintain.

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NameError: undefined local variable or method `attributes' The first failure is related to validations. Active Model does not say anything about validation macros (such as validates_presence_of), but it requires us to define a method named errors, which returns a Hash, and each value in this hash is an Array. rb module MailForm class Base include ActiveModel::Conversion extend ActiveModel::Naming extend ActiveModel::Translation include ActiveModel::Validations Now our model responds to errors and valid?.

1, on the next page. naomik ^_^ C HAPTER 3. /views", __FILE__) end end The previous code is basically expressing that if a template cannot be found under app/views, it should look within the lib/views directory inside our gem next. Rails has allowed us to customize template compiling and rendering since its first releases (we will see how in the next chapter). 0. Rails 3 improves upon that by allowing us to encapsulate in any object the logic that finds a template. This improvement means we are no longer forced to store view templates in the filesystem.

3. 0 printing, March 2011) 63 C ONFIGURING O UR R ESOLVER FOR P RODUCTION Whenever we attempt to retrieve the value for a given key in a Hash object, like hash[:b], Ruby first calculates the Object#hash for this given key and then searches whether one or more entries in the Hash object have this same hash value. 3, on the preceding page. Seeing that there are one or more entries with the value 231228, Ruby then compares whether any of the keys for these entries is equal to the given key, using the equality operator eql?.

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