By Jose Valim
Rails is likely one of the such a lot extensible frameworks in the market. This pioneering ebook deep-dives into the Rails plugin APIs and indicates you, the intermediate Rails developer, how you can use them to put in writing larger internet purposes and make your daily paintings with Rails extra efficient.
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Additional resources for Crafting Rails 4 Applications. Expert Practices for Everyday Rails Development
When invoked, the renderer receives an instance of ActionView::Base called view context and a hash of normalized options used to find, compile, and render a specific template. Whenever we render a template in Rails, its source must be first compiled into executable Ruby code. Every time some Ruby code is executed, its execution happens inside a given context and, in a Rails application, views are executed inside the view context object. All helpers available in our templates, such as form_for() and link_to(), are actually defined in modules included in the view context object.
The template is stored in the database, but we still haven’t told the UsersController to use our new resolver to retrieve it. new When we refresh the page at /users, we see the whole index page once again, retrieved from the database! And, while the template is in the database, the layout still comes from the filesystem. In other words, in a single request, we can get templates from different resolvers in our view paths. Feel free to head back to /sql_templates, manipulate the body of the stored template, and notice that the index() action in the UsersController will change accordingly.
This time our tests fail due to the following reasons: The model should respond to errors The model should respond to persisted? 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. () which behaves exactly as in Active Record. Furthermore, ActiveModel::Validations also adds several validation macros such as validates(), validates_format_of(), validates_inclusion_of(), and others.
Crafting Rails 4 Applications. Expert Practices for Everyday Rails Development by Jose Valim