By José Valim
Rails center developer Jose Valim publications you thru seven various tutorials, every 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'll know the way the Rails rendering stack works and customise it to learn templates from the database once you the best way to mimic lively list habit, like validations, in the other item. you'll find out the way to write swifter, leaner controllers, and you'll the way to combine Sinatra functions into your Rails apps, so that you can select the main applicable instrument for the activity. moreover, you are going to increase your productiveness by way of customizing turbines and responders.
This e-book may also help Rails 3's internal workings, together with turbines, template handlers, internationalization, routing, and responders. With the information you'll achieve, you'll be able to take on advanced initiatives extra simply than ever earlier than, growing strategies which are well-tested, modular, and straightforward to maintain.
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Additional resources for Crafting Rails Applications: Expert Practices for Everyday Rails Development (Pragmatic Programmers)
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. email end The clear_name and clear_email methods simply set the attribute value back to nil. attributes(*names) attr_accessor *names # 3) Ask to define the prefix methods for the given attributes names define_attribute_methods names end protected # 4) Since we declared a "clear_" prefix, it expects to have a # "clear_attribute" method defined, which receives an attribute # name and implements the clearing logic.
Those options are discovered at runtime using Ruby’s constant lookup. Add this new nickname field to your contact form views and hide it with some CSS, and we are ready to stop some bots. It’s up to you to write an integration test for it, since we still have some more Active Model investigation to do. Callbacks Wouldn’t it be cool if we could provide hooks around the deliver method so we could add some behavior before and after the delivery? This is quite easy to achieve with ActiveModel::Callbacks.
Rb in `index' This happens because we deleted the template from the filesystem. Although we added the same template to our development database, our test database remains clean, raising this MissingTemplate error in the test environment. To fix this, let’s change our sql_templates fixture. 0 printing, March 2011) 61 C ONFIGURING O UR R ESOLVER FOR P RODUCTION Our fixture is just a copy of the template. The only caveat is that Rails parses fixtures with ERb, so we need to escape our ERb tags in the previous fixture using <%% ...
Crafting Rails Applications: Expert Practices for Everyday Rails Development (Pragmatic Programmers) by José Valim