Friday, July 12, 2024

Ruby on Rails: Building a Blog with Code Examples

Last Updated on October 10, 2023


Let’s Explore Ruby on Rails: Building a Blog with Code Examples

Ruby on Rails is a popular web development framework used to build robust and dynamic websites.

With its MVC architecture, Ruby on Rails simplifies the process of building web applications.

Building a blog with code examples not only allows developers to practice their skills but also helps them understand the framework better.

Code examples provide practical insights into the implementation of various functionalities in a blog.

By following along with code examples, developers can see how different components of the Ruby on Rails framework work together.

This hands-on approach helps developers grasp concepts and techniques that can be applied to their own projects.

Moreover, building a blog with code examples helps developers gain confidence in their skills.

They learn how to structure the code, handle databases, and implement features like user authentication and commenting.

Additionally, code examples enable developers to learn from common errors and best practices.

Building a blog is an excellent way to explore the capabilities of Ruby on Rails and hone one’s development skills.

Brief description of Ruby programming language

Ruby is a dynamic, object-oriented programming language known for its simplicity and readability.

It has a clean and elegant syntax that allows developers to write code in a natural way.

Features and advantages

One of the main features of Ruby is its flexibility, as it can be used for various purposes.

Ruby has a vast and active community, which means there are plenty of resources and support available.

One of the advantages of Ruby is its focus on developer happiness, making coding a more enjoyable experience.

Ruby also has a large number of libraries and frameworks available, making it easy to build web applications.

Now let’s dive into Ruby on Rails, a web application framework built using the Ruby programming language.

Ruby on Rails, also known as Rails, follows the principles of Convention over Configuration, making development faster and easier.

Rails provides a set of conventions that allow developers to quickly build web applications without having to write repetitive code.

Familiarize readers with the language before diving into Rails

One of the key features of Rails is its emphasis on DRY (Don’t Repeat Yourself) principles.

This means that developers can define reusable code and avoid duplication, which increases productivity.

Rails also promotes RESTful architecture, which enables developers to create scalable and maintainable applications.

The framework includes built-in support for handling database migrations, making it easy to manage database changes.

Active Record, the object-relational mapping (ORM) library in Rails, simplifies database interactions and provides abstraction.

Rails also includes a powerful templating language called ERB (Embedded Ruby), which simplifies the generation of dynamic HTML.

Testing is an essential part of software development, and Rails makes it easy with its built-in testing framework.

By using Ruby on Rails, developers can quickly build and deploy web applications, saving time and effort.

Rails has a strong community that contributes to its continuous improvement and provides support through forums and online resources.

In addition, Rails has a vast collection of open-source gems, which are pre-built add-ons that can be easily integrated into applications.

These gems extend the functionality of Rails and provide solutions to common problems faced by developers.

By leveraging the power of Ruby on Rails, developers can build robust and scalable web applications with ease.

Ruby is a powerful and elegant programming language, and Ruby on Rails is a framework that empowers developers to build web applications quickly and efficiently.

Both Ruby and Rails have vibrant communities and extensive documentation, making them a popular choice among developers.

Read: Types of Compilers: JIT, AOT, and Cross-Compilation

Ruby on Rails: An Introduction

Ruby on Rails, also known as Rails, is an open-source web development framework written in the Ruby programming language.

It provides developers with a structured way to build web applications.

What is Ruby on Rails?

Ruby on Rails, often referred to as just Rails, is an MVC (Model-View-Controller) framework that follows the principles of convention over configuration.

With Rails, developers can write less code while achieving more productivity.

Rails emphasizes the use of clean, readable code and follows the DRY (Don’t Repeat Yourself) principle, reducing redundancy and making it easier to maintain and update applications over time.

The Benefits and Popularity of Ruby on Rails

Ruby on Rails has gained immense popularity among developers due to several key advantages it offers:

  1. Productivity: Rails promotes rapid development with its focus on convention over configuration and an extensive set of libraries, enabling developers to build applications faster.

  2. Easy to Learn: Ruby, the programming language used with Rails, is known for its readability and simplicity. This makes it easier for beginners to learn and get started.

  3. Active and Supportive Community: Rails has a vibrant community of developers who actively contribute gems (plug-ins) and provide support through forums, meetups, and online resources.

  4. Scalability: Rails is highly scalable and can handle high traffic loads. It has features like caching, database management, and easy integration with cloud services that help in scaling applications.

  5. Security: Rails has built-in measures to protect against common web vulnerabilities, such as SQL injection and cross-site scripting (XSS), making it a secure choice for building web applications.

Building Web Applications with Ruby on Rails, Including Blogs

One of the most popular use cases for Ruby on Rails is building web applications, including blogs.

Rails provides a solid foundation for creating feature-rich, dynamic, and user-friendly blogging platforms.

Here’s how Ruby on Rails can be used for building blogs:

  1. Modeling Data: Rails provides an easy-to-use ORM (Object-Relational Mapping) framework called ActiveRecord.

    It simplifies the process of defining and manipulating data models, making it straightforward to create a blog with posts and comments.

  2. Routing and Controllers: Rails comes with a powerful routing system that maps URLs to controller actions.

    Controllers handle requests, process data, and interact with models.

    They play a crucial role in implementing the logic of a blog application.

  3. Views and Templates: Rails utilizes ERB (Embedded Ruby) templates to generate HTML.

    Views are responsible for rendering the user interface and displaying the data from the controllers.

    They define how the blog posts and comments are presented to the user.

  4. Authentication and Authorization: Rails provides libraries like Devise and CanCanCan that make implementing user authentication and authorization functionalities a breeze.

    This ensures that only authenticated users can create, edit, and delete blog posts or comments.

  5. Testing and Debugging: Rails has a robust testing framework built-in, allowing developers to write automated tests to ensure the reliability and quality of their blog applications.

    Additionally, Rails provides extensive debugging tools to help identify and fix issues during development.

Therefore, Ruby on Rails is a powerful and popular web development framework that allows developers to build web applications efficiently, including feature-rich blogs.

Its focus on convention over configuration, productivity benefits, and extensive community support make it an excellent choice for web development projects.

Read: Learn Web Development for Free: Essential Resources

Setting up the development environment

When building a Ruby on Rails blog, the first step is to set up your development environment.

This involves installing Ruby and Rails, as well as managing dependencies using package managers like Homebrew and RVM.

Installation guide for Ruby and Rails

  1. Start by installing Ruby, which is the programming language used in Rails.

  2. You can install Ruby using a package manager like Homebrew or by downloading it from the official website.

  3. If you choose to use Homebrew, simply run brew install ruby in your terminal.

  4. Next, install Rails, which is a web application framework built on top of Ruby.

  5. You can install Rails by running gem install rails in your terminal.

  6. Once Ruby and Rails are successfully installed, you can verify the versions using ruby -v and rails -v.

Discuss the use of package managers

Package managers like Homebrew and RVM (Ruby Version Manager) make it easier to install, manage, and update software dependencies.

  • Homebrew is a popular package manager for macOS, allowing you to install software packages with a simple command.

  • RVM, on the other hand, is a tool for managing multiple Ruby installations on a single system.

    It provides an isolated environment for each Ruby version.

  • Using package managers ensures that you have the required dependencies for your Rails application.

Guide readers on installing necessary dependencies

  1. Before starting your Rails project, it’s essential to install the necessary dependencies.

  2. One common dependency is a database system like MySQL or PostgreSQL.

  3. You can install these databases using the package manager of your choice, such as Homebrew.

  4. Additionally, you might need to install other packages like ImageMagick for image processing or Redis for caching.

  5. Again, you can use package managers to install these dependencies effortlessly.

  6. Once all the dependencies are installed, you can proceed with creating your Rails blog!

Setting up the development environment is a crucial first step in building a Ruby on Rails blog.

By following the installation guide for Ruby and Rails, understanding package managers’ use, and installing necessary dependencies, you’ll be ready to dive into the exciting world of Rails development.

Read: REST vs GraphQL: Comparing API Architectures

Creating a new Rails project

Step-by-step instructions on generating a new Rails project

To get started with Ruby on Rails, you can create a new Rails project by following these step-by-step instructions:

Open your terminal or command prompt and navigate to the directory where you want to create your Rails project.

Type the following command:
`$ rails new blog`

This will generate a new Rails project called “blog” in a folder with the same name.

Once the project is created, navigate into the project folder:
`$ cd blog`

Here is an overview of the folder structure you will find in your Rails project:

  1. `app`: This folder contains the core code for your Rails application, including models, views, and controllers.

  2. `config`: This folder contains configuration files for your Rails application, such as `routes.rb`, which defines the URL routes for your application.

  3. `db`: This folder contains the database schema and migrations for your Rails application.

  4. `Gemfile`: This file lists all the gems (Ruby libraries) that your Rails application depends on.

  5. ``: This file contains general information about your Rails project.

  6. `Rakefile`: This file contains tasks that can be run from the command line using the `rake` command.

  7. `test`: This folder contains files for testing your Rails application.

Explanation of key files (e.g., Gemfile, routes.rb)

Now, let’s take a closer look at some of the key files in a new Rails project:

  1. `Gemfile`: This file is used to specify the gems that your Rails application depends on.

    You can add new gems or remove existing ones here.

  2. `routes.rb`: This file is responsible for mapping URLs to controller actions.

    You can define custom routes here.

  3. `database.yml`: This file contains the configuration for your database connection.

    You can specify the database type, name, username, and password here.

  4. `application.rb`: This file is the main configuration file for your Rails application.

    You can set general application settings here.

In summary, creating a new Rails project involves generating a project structure with folders for different components, such as the application code, configuration files, and database.

Understanding the purpose of key files like the Gemfile and routes.rb is essential for building a successful Rails application.

Now you’re ready to start building your blog using Ruby on Rails!

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Ruby on Rails Building a Blog with Code Examples

Building the Blog Model

One of the key components of building a blog with Ruby on Rails is creating the Blog model.

In this section, we will guide readers on how to create the Blog model using Rails generators, discuss the schema definition and database migrations, and explain associations with other models such as User and Comments.

Using Rails Generators

To create the Blog model, Rails provides a powerful tool called generators.

These generators allow developers to quickly scaffold the basic structure of their models, including the necessary files and code.

By running the command:

rails generate model Blog title:string body:text

We can create a new model named “Blog” with two attributes: “title” of type string and “body” of type text.

Once the generator is run, Rails will create the necessary files, including the migration file, model file, and test file.

Schema Definition and Database Migrations

The schema defines the structure of the database tables and the columns within them.

In the case of the Blog model, the schema will include the “title” and “body” columns.

To apply these changes to the database, we need to run the migrations.

Migrations are scripts that update the database schema to match the changes defined in the models and the schema file.

Running the migrations is as simple as running the command:

rails db:migrate

This will create the “blogs” table in the database with the necessary columns.

Associations with Other Models

A blog usually has associations with other models, such as the User model for the author and the Comment model for comments on each blog post.

To establish the association with the User model, we can add a “user_id” column to the Blog model:

rails generate migration add_user_id_to_blogs user:references

This command will generate a migration file with the necessary code to add the “user_id” column as a foreign key to the blogs table.

For associations with the Comment model, we can add the code to the Blog model:

has_many :comments

This code establishes a one-to-many association between the Blog model and the Comment model, allowing a blog to have multiple comments.

With these associations in place, we can easily retrieve the author of a blog post or retrieve all the comments associated with a particular blog post.

In fact, building the Blog model in Ruby on Rails is a fundamental step in creating a blog.

By using Rails generators, defining the schema, and establishing associations with other models, we can create a powerful and functional blog system.

Implementing CRUD functionality

In this section, we will dive into implementing CRUD functionality in a Ruby on Rails blog application.

We will provide step-by-step instructions for creating CRUD actions specifically for blog posts and include code examples for creating, reading, updating, and deleting posts.

Additionally, we will discuss the use of Rails scaffold generator to streamline the development process.

Introduction to CRUD functionality

CRUD stands for Create, Read, Update, and Delete, which are the basic operations performed on data.

Implementing CRUD allows users to interact with the application by creating, viewing, editing, and deleting records.

Step-by-step instructions for creating CRUD actions for blog posts

Create action

  • In the controller, define a new action to handle the creation of a new blog post.

  • Use the “new” view template to display a form for users to input blog post details.

  • Handle form submission in the “create” action, create a new post record in the database.

Read action

  • In the controller, define an index action to display a list of all blog posts.

  • Use the “index” view template to show an organized list of posts.

  • Implement a show action to display a particular post’s details based on its unique identifier.

Update action

  • In the controller, define an edit action to allow users to modify a specific blog post.

  • Use the “edit” view template, pre-filled with the post’s existing details for easier editing.

  • Update the post record in the database upon form submission in the “update” action.

Delete action

  • In the controller, define a destroy action to handle the deletion of a blog post.

  • Implement a confirmation prompt using JavaScript to prevent accidental deletions.

  • Once confirmed, remove the respective post record from the database in the “destroy” action.

Code examples for creating, reading, updating, and deleting blog posts

  • Code examples will be provided to illustrate the syntax and implementation of each CRUD action.

  • These examples will showcase the usage of Rails conventions and best practices.

The use of Rails scaffold generator

  • Rails scaffold generator is a powerful tool that automates the creation of CRUD functionality.

  • It generates pre-defined code and file structures based on a given model, significantly speeding up development.

  • We will discuss the benefits and limitations of using the Rails scaffold generator and provide recommendations.

By following the step-by-step instructions and referring to the code examples, you will be able to successfully implement CRUD functionality for blog posts in your Ruby on Rails application.

Understanding the usage of the Rails scaffold generator will further enhance your development efficiency.

Have fun building your blog and empowering users with CRUD operations!

Adding User Authentication

User authentication is an essential feature for any blog as it provides a secure way for readers and writers to interact with the website.

In this section, we will guide you on implementing user authentication using the Devise gem, explaining the benefits and providing code examples for user registration, login, and logout.

Implementing User Authentication with Devise Gem

The Devise gem is a flexible and powerful tool that simplifies user authentication in Ruby on Rails applications.

By following these steps, you can easily add user authentication functionality to your blog:

  1. First, add the Devise gem to your Gemfile


  2. Run the bundle install command to install the gem

    bundle install

  3. Generate the necessary files for Devise, including a User model

    rails generate devise:install
    rails generate devise User

  4. Migrate the database to include the new User model

    rails db:migrate

  5. Configure the routes for user authentication

    #config/routes.rb devise_for :users

  6. Add user authentication filters to your controllers

    before_action :authenticate_user!

  7. Finally, update your views to include registration, login, and logout functionality


    <%= form_for(resource, as: resource_name, url: registration_path(resource_name)) do |f| %>

    <% end %>

    <%= form_for(resource, as: resource_name, url: session_path(resource_name)) do |f| %>

    <% end %>

    <%= link_to “Logout”, destroy_user_session_path, method: :delete %>

Benefits of User Authentication

  • Protects user data: User authentication ensures that only authorized users can access sensitive information.

  • Enhances user experience: Authenticated users can personalize their experience with profiles, bookmarks, etc.

  • Enables user interactions: Authentication allows users to comment, like, and interact with blog posts.

  • Improves security: User authentication reduces the risk of unauthorized access and malicious activities.

Code Examples for User Registration, Login, and Logout


# app/controllers/registrations_controller.rb
def new
@user =

def create
@user =
redirect_to root_path, notice: “Registration successful!”
render :new


# app/controllers/sessions_controller.rb
def new

def create
user = User.find_by(email: params[:email])
if user&.valid_password?(params[:password])
sign_in user
redirect_to root_path, notice: “Login successful!”
flash[:alert] = “Invalid email or password.”
render :new


# app/controllers/sessions_controller.rb
def destroy
sign_out current_user
redirect_to root_path, notice: “Logged out successfully!”

In this section, we discussed the importance of user authentication for a blog and provided a step-by-step guide on implementing it with the Devise gem.

We also shared code examples for user registration, login, and logout.

Adding user authentication will greatly enhance the security and functionality of your blog, making it a more enjoyable experience for your users.

Implementing comments functionality

Adding comments to blog posts is an important feature to engage readers and spark discussions.

In this section, we will provide step-by-step instructions on how to implement comments functionality in a Ruby on Rails blog.

We will also discuss the associations between comments and blog posts and provide code examples for creating and displaying comments.

Step-by-Step Instructions on Adding Comments to Blog Posts

Generate the Comment Model and Migration

Run the following command in your terminal to generate the Comment model and migration:
rails generate model Comment content:string user_id:integer post_id:integer

Set Up Associations Between Comments and Blog Posts

In the Comment model, add the following associations
belongs_to :user
belongs_to :post

In the User model, add the following association:
has_many :comments

In the Post model, add the following association:
has_many :comments

Run Database Migrations

Run the following command in your terminal to create the comments table in the database:
rails db:migrate

Create Comment Form

In the views/posts/show.html.erb file, add a form to create a new comment:
<%= form_with(model: [post,]) do |form| %>
<%= form.text_area :content, placeholder: ‘Add your comment…’ %>
<%= form.submit ‘Submit’ %>
<% end %>

Handle Comment Creation in the Posts Controller

In the controllers/posts_controller.rb file, add the following code to create a new comment:
def create
@post = Post.find(params[:id])
@comment = @post.comments.create(comment_params)
redirect_to post_path(@post)

Add the following private method to permit the comment parameters:
def comment_params

Display Comments on Blog Posts

– In the views/posts/show.html.erb file, add the following code to display comments:
<% @post.comments.each do |comment| %>

<%= comment.content %>
<% end %>

And that’s it! You have successfully implemented comments functionality in your Ruby on Rails blog.

Implementing comments functionality in a Ruby on Rails blog is crucial for fostering user engagement and encouraging discussions.

By following the step-by-step instructions provided in this section, you can easily add comments to your blog posts.

Remember to set up the associations between comments and blog posts, create the necessary models and views, and handle comment creation and display.

With these code examples and guidelines, you can enhance the interactivity and community aspect of your blog.

Styling the Blog with CSS

In this section, we will explore the process of styling the blog with CSS.

We will guide readers on how to add CSS styles to the different views of the blog and discuss popular CSS frameworks like Bootstrap and their integration with Rails.

Additionally, we will provide code examples to help readers style the blog layout and its individual components.

Guide Readers on Adding CSS Styles to the Blog Views

Styling the blog views involves customizing the appearance of different elements such as headers, paragraphs, buttons, and images.

To add CSS styles, follow these steps:

  1. Create a new CSS file in the app/assets/stylesheets directory.

  2. Link the CSS file in the layout for each blog view by adding the following line:

    <%= stylesheet_link_tag ‘custom_styles’ %>

  3. Write your CSS rules inside the newly created CSS file.

    You can target specific elements using CSS selectors.

Discuss Popular CSS Frameworks and Their Integration with Rails

CSS frameworks like Bootstrap provide pre-defined styles and components that can help streamline the styling process.

To integrate such frameworks with Rails, follow these steps:

  1. Install the desired CSS framework (e.g., Bootstrap) by adding it to your Gemfile:

    gem ‘bootstrap’

  2. Run bundle install to install the gem.

  3. Add the following line to your application’s CSS file (app/assets/stylesheets/application.css):

    @import “bootstrap”;

  4. Now, you can utilize the CSS classes and components provided by the framework in your views.

Provide Code Examples for Styling the Blog Layout and Components

The following code examples demonstrate how to style the blog layout and some commonly used components:

Styling the Blog Layout

.blog-layout {
display: grid;
grid-template-columns: 1fr 2fr;
gap: 20px;

.blog-sidebar {
background-color: #f2f2f2;
padding: 10px;

.blog-content {
background-color: #fff;
padding: 20px;

Styling Buttons

.button {
display: inline-block;
padding: 10px 20px;
font-size: 16px;
background-color: #333;
color: #fff;
border-radius: 5px;
text-decoration: none;

Styling Images

.image {
max-width: 100%;
height: auto;
border-radius: 5px;

Feel free to modify these examples or create your own styles as per your design requirements.

Generally, adding CSS styles to the blog views enhances its visual appeal and user experience.

We explored the process of adding CSS styles, discussed popular CSS frameworks like Bootstrap, and provided code examples for styling the blog layout and various components.

By following these guidelines, you can create a visually appealing and well-designed blog using Ruby on Rails.


In this section, we have explored the process of building a blog using Ruby on Rails.

We started by setting up the project and creating models for posts and comments.

Next, we implemented the controllers and views to handle user interactions.

Throughout the section, we emphasized the importance of code examples in understanding the concepts.

By providing clear and concise code snippets, readers were able to grasp the fundamental principles of building a blog with Rails.

Code examples not only help in solidifying the understanding of the topic but also serve as a starting point for readers to experiment with their own blog projects.

They can modify the code, add new features, and personalize the blog according to their requirements.

To further enhance their learning, readers are encouraged to explore additional resources and documentation related to Ruby on Rails development.

By diving deeper into the framework, they can gain a more comprehensive understanding of building web applications.

Building a blog with Ruby on Rails can be an exciting and rewarding experience.

The step-by-step process and code examples provided in this section should serve as a solid foundation for readers to start their own blog projects and explore the limitless possibilities of web development.

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