How Does Rails Handle View Rendering and Template Management?
How Does Rails Handle View Rendering
Rendering is one of the final steps in a Rails controller action, so it’s important to understand how this process works. A good understanding of how rendering is done can help you write better controllers and improve your Rails applications.
The template system in ruby on rails course is designed to be a simple and consistent format for presenting the data of your application. It follows DRY code principles and enables developers to use the same template across pages in an application. The most common template is the view template, but Rails also comes with special templates like layouts and partials.
Layouts are a way to control the global layout of an application, such as a primary navigation menu that stays the same across pages. They’re also used for nested templates, which we will talk about in Chapter 7.
How Does Rails Handle View Rendering and Template Management?
Partials are a subtemplate of a layout that can be used multiple times within the same page. They can be used to replace the content of a single view (as with a form or navigation menu) or to update parts of a page when an Ajax call occurs without reloading the page.
If you need to encapsulate an element of a partial in a component, consider using the cells library. This enables you to use well-known OOP patterns and enable reusability for your views.
The encapsulation in cells allows you to create quick, reusable bits of your application that are scalable and testable. This can lead to a dramatic speed improvement in your Rails app, as well as increased reliability because they are not tied to any other parts of your application.
Views are the most important part of sap analytics cloud tutorials the presentation of a page in a Rails application. They can be plain HTML files, but they often contain some Ruby code as well.
When you render a view, Rails looks at its source and interprets the HTML as Ruby code. It then uses embedded Ruby (ERb) syntax to display the result in the browser.
This is a great option when you’re responding to Ajax or web service requests that expect something other than proper HTML, but it defeats the MVC orientation of Rails and can make it difficult for other developers to understand the logic behind your project.
It’s usually best to avoid this, especially if you want to work in an MVC style.
The :redirect_to option is similar to the :redirect_back option in that it sets HTTP responses but doesn’t halt execution. It’s used to set the redirect URL or back to the origin of a request, and it can be set to both numeric and symbolic header designations.
For this reason, some developers inexperienced with Rails tend to think that redirect_to and redirect_back are similar to goto commands, moving execution from one place in their method to another. This is not true!
This is because the response is only set by Rails after it has finished running the code in the method. Then, when a new request comes in, Rails will know what to do next, and it will stop running the old method and start running the new one.