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

By José Valim

Rails center developer Jose Valim publications you thru seven varied tutorials, every 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 if you how to mimic energetic checklist habit, like validations, in the other item. you will discover out tips 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 task. furthermore, you are going to increase your productiveness through customizing turbines and responders.

This booklet can assist you realize 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 complex initiatives extra simply than ever earlier than, developing ideas which are well-tested, modular, and simple to maintain.

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0 printing, March 2011) 35 C REATING O UR M ODEL Although we could add this method to MailForm::Base, we are not going to implement it ourselves. Instead, let’s include ActiveModel::Conversion, which implements to_model exactly as we discussed and two other methods required by Active Model as well: to_key and to_param. The to_key method should return an array of keys that uniquely identifies the model, if any exists, and it is used by dom_id in our views. 0 along with dom_class and a bunch of other helpers to better organize our views based on some conventions.

To solve this in our resolver, one option is to generate an order clause for each detail and get the result properly sorted from the database. Another option is to sort the returned templates in Rails. However, for simplicity, instead of passing all locales and formats to the SQL query, let’s simply pick the first ones from the array. 0 printing, March 2011) 58 S ETTING U P A S QL R ESOLVER # Normalize name and prefix, so the tuple ["index", "users"] becomes # "users/index" and the tuple ["template", nil] becomes "template".

Empty? virtual_path end end The find method in our resolver should return an ActionView::Template instance. new(source, identifier, handler, details) The source is the body of the template stored in the database. The identifier is an unique string used to represent the template. We will ensure this uniqueness by adding the template ID in the database to it. The handler is the object responsible for rendering the template. registered_template_handler("erb") # => ActionView::Template::Handlers::ERB Finally, the last parameter given on template initialization is a hash that should contain three details: the :format of the template found, the last time the template was updated as :updated_at, and a :virtual_path that represents the template.

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