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Best Rails Tutorial

author
Ava Flores
• Friday, 01 January, 2021
• 25 min read

Tough job ahead of doubt how can you pick the best Ruby on Rails tutorials from an overwhelming number of pieces out there? More than that, you will find a number of advanced tutorials in case you wish to develop your Rails skills further.

rails tutorial
(Source: www.slideshare.net)

Contents

Choosing the right tutorial when starting your journey with Ruby on Rails might determine how well you will do in further education, and most importantly, future work. Considering the amount of ROR tutorials available there, and how big industry it has become, it might be hard to pick the one that would prepare you the best.

I've done the hard work for you and already run through some top platforms and sources that can teach you how to code in Ruby on Rails with a cover-to-cover approach. This is a curated list of 100% free, no paywall tutorials for you to learn Ruby on Rails.

As a bonus point, there is a whole chapter dedicated to Ruby on Rails interview questions that will give you a better idea of what you can expect when applying for your first job. FreeCodeCamp is a platform where developers can publish a variety of posts on different topics, all revolving around programming.

Fortunately, thanks to a good tagging system, you can easily find Rails related posts among which are some great tutorials explaining how it all works from inside. This could give you a better idea of what goes on under the hood, and this knowledge easily translates to tweaking your overall dev skills.

There are, however, tutorials that focus on more advanced parts of Rails development like code quality, performance, reliability, stability, scalability, and maintainability. It's a GitHub repository with tons of comparison between different uses of arrays, dates, string, hashes and more.

rails tutorial ch1
(Source: www.slideshare.net)

Our HIX tutorials are designed for developers with more advanced skills who want to focus on code quality, monitoring, proper database work, and general project configuration. Each tutorial touches a point on a different tool, explaining it deeply in a cover-to-cover manner.

Yet this old school cool medium still has the advantage of presenting you with a broader approach to a given topic. The book was published back in 2010 but is frequently updated to keep up with the latest Ruby on Rails versions.

“Ruby on RailsTutorial by Michael Hart You will get a great overview of the most basic concepts with simple examples. Ruby is a language released by Akihito Mutsuhito in 1995 that bills itself as “a programmer's best friend”.

Every aspect of Ruby is designed to make programming easier for the developer. We may earn an affiliate commission when you make a purchase via links on Courses.

Ajax, jQuery, plain JavaScript Bootstrap and materialize CSS for UI styling Build fully automated test suites by writing unit, functional and integration tests Learning database migrations: One-to-many, many-to-many association implementation with Rails using Active Record You will acquire skills rapidly; utilizing homework assignments, quizzes, coding exercises and free web based resources to go with the video lectures.

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Create a Ruby web app through the command line interface. This course will first introduce you to Ruby on Rails as a programming language and its uses for developing web applications.

You will learn its installation process and object orientation and be shown how to make a class. You will then learn how to reference the current object, class methods, and inheritance.

You will then study the Ruby on Rails syntax and learn how loops and conditional branching work. You will also learn how to create methods, along with the correct syntax for writing these procedures in Ruby on Rails.

You will study the MVC architecture, which will help you organize code for the creation of robust web applications, and learn how it separates the application into three main logical components which are the model, the view, and the controller. This web application development course will teach you how Ruby on Rails is used to develop modern web applications in an effective and efficient manner.

You can take Ruby on Rails for Web Application Development Certificate Course on Alison. Don't simply follow a tutorial, learn what it really takes to become a pro Rails developer with this immersive course.

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Implement advanced JavaScript components, such as persistent drag and drop functionality and live page update via Actionable into a Rails application. Deploy a Rails application along with the Actionable web socket feature to Heroku.

Build jQuery and CoffeeScript components that can be utilized by the Rails application. This Ruby on Rails course includes a Deep Dive at the end of each section.

This technology forms the backend of amazing new Websites and Web apps. Some top sites using Ruby on Rails are Basecamp, Twitter, Shopify, GitHub, LivingSocial, Groupon and Yellow pages.

Build basic Rails applications Learn MVC structure and put it to action Take the first step towards becoming a Rails developer Learn basics of Ruby programming language This Ruby on Rails course provides a structured introduction to programming, with varied data structures as simple mini projects as developed moving on to Rails where a To-do web app project is developed.

There will also be references to free resources available on the internet to supplement the course materials. Master Ruby on Rails, HTML, CSS, APIs, and other web technologies by building Etsy, Yelp, and Craigslist from scratch.

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Prototype any MVP for a web app Install and setup Ruby on Rails Create new web applications in Ruby on Rails and launch it live on the web Style websites with front-end tools like CSS, JavaScript, and Bootstrap Scrape data from any website and store it in a database Write Ruby scripts to automate tasks Parse, clean, and analyze data Read technical documentation including Ruby gems and web tools Master GitHub and Heroku Learn to work and code in the command line Add Google Maps integration with API Work within the Rails console to manipulate data Add online payments and bank transfers using the Stripe API Host images with Amazon S3 or Dropbox and embed images on any site Implement multiple types of user accounts and login In this Ruby on Rails course, you’ll learn by building working applications.

You will find out about some standard types included in Ruby, such as strings, arrays, hashes and regular expressions. You will also get an introduction to tools and techniques you need to write real world software, including testing, debugging and packaging your code.

This course will cover everything you need to know to understand, build, and design your own Ruby gems. Aspiring users who want to master Ruby Programming Language can enhance their programming language skills with our Ruby fundamentals course from scratch.

A detailed introduction to Ruby on Rails Exploring the cloud development environment Building your very first web page Understanding version control with Git Setting up Bitbucket How to host your app with Heroku How to integrate Bootstrap, Nav Bar, Partials, Jumbo tron and Buttons How to modify views Store images using Amazon S3 How to make your site mobile ready In case you want to explore more, you can take the free Ruby on Rails courses.

This guide is designed for beginners who want to get started with a Rails application from scratch. Rails is a web application framework running on the Ruby programming language.

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Be aware that some resources, while still excellent, cover older versions of Ruby, and may not include some syntax that you will see in day-to-day development with Rails. Rails is a web application development framework written in the Ruby programming language.

If you learn “The Rails Way” you'll probably discover a tremendous increase in productivity. If you persist in bringing old habits from other languages to your Rails development, and trying to use patterns you learned elsewhere, you may have a less happy experience.

The Rails philosophy includes two major guiding principles: Don't Repeat Yourself: DRY is a principle of software development which states that “Every piece of knowledge must have a single, unambiguous, authoritative representation within a system”.

By not writing the same information over and over again, our code is more maintainable, more extensible, and less buggy. Convention Over Configuration: Rails has opinions about the best way to do many things in a web application, and defaults to this set of conventions, rather than require that you specify minutiae through endless configuration files.

By following along with this guide, you'll create a Rails project called blog, a (very) simple weblog. Before you can start building the application, you need to make sure that you have Rails itself installed.

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The examples below use $ to represent your terminal prompt in a UNIX-like OS, though it may have been customized to appear differently. 3.1.1 Installing Ruby Open up a command line prompt.

On macOS open Terminal.app; on Windows choose “Run” from your Start menu and type cmd.exe. Finally, you'll need Node.js and Yarn installed to manage your application's JavaScript.

This will create a Rails application called Blog in a blog directory and install the gem dependencies that are already mentioned in Gem file using bundle install. If you're using Windows Subsystem for Linux then there are currently some limitations on file system notifications that mean you should disable the spring and listen gems which you can do by running rails new blog --skip-spring --skip-listen instead.

File/FolderPurposeapp/Contains the controllers, models, views, helpers, mailers, channels, jobs, and assets for your application. You'll focus on this folder for the remainder of this guide.bin/Contains the rails script that starts your app and can contain other scripts you used to set up, update, deploy, or run your application.config/Contains configuration for your application's routes, database, and more.

For more information about Rack, see the Rack website .db/Contains your current database schema, as well as the database migrations. GemfileGemfile.Lockheed files allow you to specify what gem dependencies are needed for your Rails application. For more information about Bundler, see the Bundler website .lib/Extended modules for your application.log/Application log files.package.months file allows you to specify what NPM dependencies are needed for your Rails application.

rails tutorial ch1
(Source: es.slideshare.net)

Rather than changing Rake file, you should add your own tasks by adding files to the lib/tasks directory of your application.README.Mathis is a brief instruction manual for your application. In a typical Rails application this includes vendored gems.gitignoreThis file tells git which files (or patterns) it should ignore.

To see it, you need to start a web server on your development machine. JavaScript asset compression requires you have a JavaScript runtime available on your system, in the absence of a runtime you will see an execs error during asset compression.

This will start up Puma, a web server distributed with Rails by default. To see your application in action, open a browser window and navigate to http://localhost:3000.

When you want to stop the web server, hit Ctrl+C in the terminal window where it's running. In the development environment, Rails does not generally require you to restart the server; changes you make in files will be automatically picked up by the server.

To get Rails saying “Hello”, you need to create at minimum a route, a controller with an action, and a view. A controller action performs the necessary work to handle the request, and prepares any data for the view.

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In terms of implementation: Routes are rules written in a Ruby DSL (Domain-Specific Language). Controllers are Ruby classes, and their public methods are actions.

Bin/ rails generate controller Articles index --skip-routes Copy When an action does not explicitly render a view (or otherwise trigger an HTTP response), Rails will automatically render a view that matches the name of the controller and action.

Text when we visit http://localhost:3000, confirming that the root route is also mapped to the index action of ArticlesController. All of these are typical pieces of a web application that follows the MVC (Model-View-Controller) pattern.

MVC is a design pattern that divides the responsibilities of an application to make it easier to reason about. Since we have a controller and a view to work with, let's generate the next piece: a model.

To help remember this convention, think of how you would call the model's constructor: we want to write Article.new(...), not Articles.new(...). By default, the create_table method adds an id column as an auto-incrementing primary key.

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Inside the block for create_table, two columns are defined: title and body. As we will see, Rails will manage these for us, setting the values when we create or update a model object.

The command will display output indicating that the table was created: To play with our model a bit, we're going to use a feature of Rails called the console.

Let's go back to our controller in app/controllers/articles_controller.Rb, and change the index action to fetch all articles from the database: ERA is a emulating system that evaluates Ruby code embedded in a document.

Anything you could write in a regular Ruby program can go inside these ERA tags, though it's usually best to keep the contents of ERA tags short, for readability. But, since we do want to output the value returned by article. Title (for each article), we've enclosed that code in <%= %>.

The Rails router maps the root route to the index action of ArticlesController. The ERA code in the view is evaluated to output HTML.

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The server sends a response containing the HTML back to the browser. Almost all web applications involve CRUD (Create, Read, Update, and Delete) operations.

Rails acknowledges this, and provides many features to help simplify code doing CRUD. Let's begin exploring these features by adding more functionality to our application.

Let's add a new view that shows the title and body of a single article. We start by adding a new route that maps to a new controller action (which we will add next).

A route parameter captures a segment of the request's path, and puts that value into the paras Hash, which is accessible by the controller action. For example, when handling a request like GET http://localhost:3000/articles/1, 1 would be captured as the value for :id, which would then be accessible as paras in the show action of ArticlesController.

The show action calls Article. Find () with the ID captured by the route parameter. As you might have guessed, we will do so by adding new routes, controller actions, and views.

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Whenever we have such a combination of routes, controller actions, and views that work together to perform CRUD operations on an entity, we call that entity a resource. Rails provides a routes' method named resources that maps all the conventional routes for a collection of resources, such as articles.

The values in the “Prefix” column above plus a suffix of _URL or _path form the names of these helpers. Typically, in web applications, creating a new resource is a multi-step process.

If there are no errors, then the resource is created and some kind of confirmation is displayed. Else, the form is redisplayed with error messages, and the process is repeated.

In a Rails application, these steps are conventionally handled by a controller's new and create actions. The creation action instantiates a new article with values for the title and body, and attempts to save it.

Otherwise, if the user refreshes the page, the browser will make the same request, and the mutation will be repeated. Using a form builder, we can write a minimal amount of code to output a form that is fully configured and follows Rails conventions.

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Copy Thus, the creation action can access the submitted title via paras and the submitted body via paras.

Otherwise, a malicious user could potentially submit extra form fields and overwrite private data. In fact, if we pass the unfiltered paras Hash directly to Article. New, Rails will raise a ForbiddenAttributesError to alert us about the problem.

So we will use a feature of Rails called Strong Parameters to filter paras. Let's add a private method to the bottom of app/controllers/articles_controller.Rb named article_params that filters paras.

Handling invalid user input is another step of that process. Rails provides a feature called validations to help us deal with invalid user input.

Additionally, it declares that the body value must be at least 10 characters long. Active Record automatically defines model attributes for every table column, so you don't have to declare those attributes in your model file.

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With our validations in place, let's modify app/views/articles/new.html.era to display any error messages for title and body : The method returns an array of user-friendly error messages for a specified attribute.

To understand how all of this works together, let's take another look at the new and create controller actions: When we submit the form, the POST /articles request is mapped to the creation action.

If any validation fails, article will not be saved, and app/views/articles/new.html.era will be rendered with error messages. Else, the form is redisplayed with error messages, and the process is repeated.

These steps are conventionally handled by a controller's edit and update actions. If no validations fail and the update is successful, the action redirects the browser to the article's page.

Else, the action redisplays the form, with error messages, by rendering app/views/articles/edit.html.era. Even the code will be the same, thanks to the Rails form builder and resourceful routing.

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The form builder automatically configures the form to make the appropriate kind of request, based on whether the model object has been previously saved. Because the code will be the same, we're going to factor it out into a shared view called a partial.

Because partials are shared code, it is best practice that they do not depend on specific instance variables set by a controller action. We can now update an article by visiting its edit page, e.g. http://localhost:3000/articles/1/edit.

Deleting a resource is a simpler process than creating or updating. And our resourceful routing (resources :articles) already provides the route, which maps DELETE /articles/:id requests to the destroy action of ArticlesController.

} option causes a confirmation dialog to appear when the link is clicked. Both of these options are powered by a feature of Rails called Unobtrusive JavaScript (US).

The difference is the line belongs_to :article, which sets up an Active Record association. The (:references) keyword used in the bash command is a special data type for models.

(Source: www.slideshare.net)

Active Record associations let you easily declare the relationship between two models. In fact, this is very close to the syntax that Rails uses to declare this association.

These two declarations enable a good bit of automatic behavior. As with the welcome controller, we will need to add a route so that Rails knows where we would like to navigate to see comments.

This is another part of capturing the hierarchical relationship that exists between articles and comments. With the model in hand, you can turn your attention to creating a matching controller.

So first, we'll wire up the Article show template (app/views/articles/show.html.era) to let us make a new comment: This adds a form on the Article show page that creates a new comment by calling the CommentsControllercreate action.

Class CommentsController < ApplicationController def create article = Article.find(paras) comment = article.comments.create(comment_params) redirect_to article_path(article) end private def comment_params paras.require(:comment).permit(:commenter, :body) end Copy In addition, the code takes advantage of some methods available for an association.

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As we have already seen, this calls the show action of the ArticlesController which in turn renders the show.html.era template. Now you can add articles and comments to your blog and have them show up in the right places.

As the render method iterates over the article.comments collection, it assigns each comment to a local variable named the same as the partial, in this case comment, which is then available in the partial for us to show. Rails is smart enough to spot the forward slash in that string and realize that you want to render the _form.html.era file in the app/views/comments directory.

The article object is available to any partials rendered in the view because we defined it as an instance variable. Concerns are a way to make large controllers or models easier to understand and manage.

This also has the advantage of reusability when multiple models (or controllers) share the same concerns. Concerns are implemented using modules that contain methods representing a well-defined slice of the functionality that a model or controller is responsible for.

Another important feature of a blog is being able to delete spam comments. To do this, we need to implement a link of some sort in the view and a destroy action in the CommentsController.

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The destroy action will find the article we are looking at, locate the comment within the article.comments collection, and then remove it from the database and send us back to the show action for the article. Rails allows you to use the dependent option of an association to achieve this.

Class Article < ApplicationRecord include Visible has_many :comments, dependent: :destroy validates :title, presence: true validates :body, presence: true, length: {minimum: 10} end Copy Rails provides an HTTP authentication system that will work nicely in this situation.

Security, especially in web applications, is a broad and detailed area. Now that you've seen your first Rails application, you should feel free to update it and experiment on your own.

As you need assistance getting up and running with Rails, feel free to consult these support resources: The easiest way to work with Rails is to store all external data as UTF-8.

If you have made a mistake in this area, the most common symptom is a black diamond with a question mark inside appearing in the browser. Another common symptom is characters like “A” appearing instead of “ü”.

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Rails takes a number of internal steps to mitigate common causes of these problems that can be automatically detected and corrected. However, if you have external data that is not stored as UTF-8, it can occasionally result in these kinds of issues that cannot be automatically detected by Rails and corrected.

If your text editor does not, this can result in special characters that you enter in your templates (such as é) to appear as a diamond with a question mark inside in the browser. However, if your database is not using UTF-8 internally, it may not be able to store all characters that your users enter.

For instance, if your database is using Latin-1 internally, and your user enters a Russian, Hebrew, or Japanese character, the data will be lost forever once it enters the database. Make sure to check Edge Guides first to verify if the issues are already fixed or not on the master branch.

Check the Ruby on Rails Guides Guidelines for style and conventions. If for whatever reason you spot something to fix but cannot patch it yourself, please open an issue.

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