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

By José Valim

Rails middle developer Jose Valim courses you thru seven various 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 if you how you can mimic lively 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 instrument for the activity. additionally, you'll increase your productiveness by way of customizing turbines and responders.

This ebook can assist Rails 3's internal workings, together with turbines, template handlers, internationalization, routing, and responders. With the data you'll achieve, you'll be capable of take on complex initiatives extra simply than ever ahead of, developing recommendations which are well-tested, modular, and straightforward to maintain.

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We ensure that the body and path values cannot be blank, and we also guarantee that a valid format, locale, and handler are supplied. As a result of adding some validations to our models, some functionals tests are failing since our fixtures now contain invalid data. yml one: path: "some/path" format: "html" locale: "en" handler: "erb" partial: false body: "Body" It Works! Now with our resolver implemented and a green test suite, we get to create a new scaffold and make it use templates from the database, instead of the filesystem.

You can store your templates anywhere and give them any source or any identifier, but you need to provide a :virtual_path that represents what the path would be if this template was stored in the filesystem. message") to work as expected by setting the virtual path to be users/index. With tests in place and an understanding of how templates are initialized, let’s implement our resolver by inheriting from ActionView::Resolver and implementing find_template. It’s important to consider in our resolver that the order of the given details matters.

Cache_classes end def find_templates(name, prefix, partial, details) raise NotImplementedError end def cached(key, prefix, name, partial) return yield unless key && caching? @cached[key][prefix][name][partial] ||= yield end end end The find_all method implements a basic caching mechanism where the block given to cached is yielded if no previous entry exists in the cache. 2: Template lookup with SqlTemplate And, if in fact no entry exists in the cache, find_templates is invoked. The find_templates method raises a NotImplementedError, indicating it should actually be implemented in child classes.

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