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Khamisi Kibet

Khamisi Kibet

Software Developer

I am a computer scientist, software developer, and YouTuber, as well as the developer of this website, spinncode.com. I create content to help others learn and grow in the field of software development.

If you enjoy my work, please consider supporting me on platforms like Patreon or subscribing to my YouTube channel. I am also open to job opportunities and collaborations in software development. Let's build something amazing together!

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    infor@spinncode.com

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    Nairobi, Kenya
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7 Months ago | 49 views

**Course Title:** Mastering Ruby on Rails: Building Scalable Web Applications **Section Title:** Routing, Controllers, and Views **Topic:** Building views with Embedded Ruby (ERB) templates ### Introduction to ERB Templates ERB (Embedded Ruby) templates are a powerful feature of Rails that allow you to embed Ruby code directly into your HTML views. This enables you to dynamically generate content, loop through data, and make decisions based on conditions, all within the context of your HTML templates. In this topic, we'll explore the basics of ERB templates, how to use them to build dynamic views, and some best practices to keep in mind. ### What is ERB? ERB is a templating engine that comes bundled with Rails. It allows you to write Ruby code directly in your HTML templates using a special syntax. ERB templates typically have a `.html.erb` or `.erb` extension. ERB uses a syntax similar to JSP (Java Server Pages) or PHP, but with a more Ruby-like syntax. The basic syntax is as follows: ```erb <% # Ruby code here %> ``` This syntax is used to execute Ruby code within your ERB template. ### Using ERB to Display Data One of the most common uses of ERB is to display data from your database or model. Let's say you have a `User` model and you want to display a list of all users on a page. ```erb <!-- users/index.html.erb --> <h1>Users</h1> <ul> <% @users.each do |user| %> <li><%= user.name %></li> <% end %> </ul> ``` In this example, `@users` is an instance variable set by the controller that contains a collection of `User` objects. The ERB template loops through each user using the `each` method and displays the `name` attribute of each user. ### ERB Syntax ERB has two types of syntax: `<% %>` and `<%= %>`. The difference between them is subtle but important. * `<% %>`: This syntax is used to execute Ruby code, but does not output anything to the template. It's used for logic, loops, and conditionals. * `<%= %>`, on the other hand, is used to execute Ruby code and output the result to the template. This is typically used to display data or render HTML elements. Here's an example of the difference: ```erb <!-- examples.html.erb --> <h1>Examples</h1> <p>The current time is: <%= Time.current %></p> <% # This code will not output anything to the template %> <% 5.times do |i| %> <li><%= i %></li> <% end %> ``` In this example, `Time.current` is executed and the result is output to the template using `<%= %>`. The `times` loop, on the other hand, uses `<% %>`, which executes the code but does not output anything to the template. ### Partials and Layouts Rails provides two powerful features that make building views with ERB templates even easier: partials and layouts. Partials are reusable templates that can be rendered from within other templates. They're useful for breaking up complex templates into smaller, more manageable pieces. Layouts are used to provide a common structure to your views. They can include headers, footers, and other recurring elements. Here's an example of a partial: ```erb <!-- _partial.html.erb --> <p>This is a partial</p> ``` ```erb <!-- main.html.erb --> <h1>Main template</h1> <%= render 'partial' %> ``` And here's an example of a layout: ```erb <!-- application.html.erb --> <!DOCTYPE html> <html> <head> <title>My App</title> </head> <body> <header>My App Header</header> <%= yield %> <footer>My App Footer</footer> </body> </html> ``` ### Best Practices and Security Considerations When using ERB templates, there are a few best practices and security considerations to keep in mind: * Always use instance variables (e.g., `@users`) to pass data to your templates. * Use the `render` method to include partials and layouts. * Avoid using ERB to output sensitive data (e.g., passwords or credit card numbers). * Use HTML escaping (e.g., `CGI::escapeHTML`) to prevent XSS attacks. ### Conclusion ERB templates are a powerful feature of Rails that make building dynamic views a breeze. By using ERB syntax, partials, and layouts, you can create complex and scalable web applications with ease. In the next topic, we'll cover understanding Rails form helpers and handling form submissions. Do you have any questions or need help with something? Leave a comment below or [post on the Rails community forum](https://community.rubyonrails.org/). ### Additional Resources * [Rails Guide: Action View](https://guides.rubyonrails.org/action_view_overview.html) * [Rails API: ActionView](https://api.rubyonrails.org/classes/ActionView/Base.html) * [ERb documentation](https://ruby-doc.org/stdlib-2.7.1/libdoc/erb/rdoc/ERb.html)
Course

Building Views with Embedded Ruby (ERB)

**Course Title:** Mastering Ruby on Rails: Building Scalable Web Applications **Section Title:** Routing, Controllers, and Views **Topic:** Building views with Embedded Ruby (ERB) templates ### Introduction to ERB Templates ERB (Embedded Ruby) templates are a powerful feature of Rails that allow you to embed Ruby code directly into your HTML views. This enables you to dynamically generate content, loop through data, and make decisions based on conditions, all within the context of your HTML templates. In this topic, we'll explore the basics of ERB templates, how to use them to build dynamic views, and some best practices to keep in mind. ### What is ERB? ERB is a templating engine that comes bundled with Rails. It allows you to write Ruby code directly in your HTML templates using a special syntax. ERB templates typically have a `.html.erb` or `.erb` extension. ERB uses a syntax similar to JSP (Java Server Pages) or PHP, but with a more Ruby-like syntax. The basic syntax is as follows: ```erb <% # Ruby code here %> ``` This syntax is used to execute Ruby code within your ERB template. ### Using ERB to Display Data One of the most common uses of ERB is to display data from your database or model. Let's say you have a `User` model and you want to display a list of all users on a page. ```erb <!-- users/index.html.erb --> <h1>Users</h1> <ul> <% @users.each do |user| %> <li><%= user.name %></li> <% end %> </ul> ``` In this example, `@users` is an instance variable set by the controller that contains a collection of `User` objects. The ERB template loops through each user using the `each` method and displays the `name` attribute of each user. ### ERB Syntax ERB has two types of syntax: `<% %>` and `<%= %>`. The difference between them is subtle but important. * `<% %>`: This syntax is used to execute Ruby code, but does not output anything to the template. It's used for logic, loops, and conditionals. * `<%= %>`, on the other hand, is used to execute Ruby code and output the result to the template. This is typically used to display data or render HTML elements. Here's an example of the difference: ```erb <!-- examples.html.erb --> <h1>Examples</h1> <p>The current time is: <%= Time.current %></p> <% # This code will not output anything to the template %> <% 5.times do |i| %> <li><%= i %></li> <% end %> ``` In this example, `Time.current` is executed and the result is output to the template using `<%= %>`. The `times` loop, on the other hand, uses `<% %>`, which executes the code but does not output anything to the template. ### Partials and Layouts Rails provides two powerful features that make building views with ERB templates even easier: partials and layouts. Partials are reusable templates that can be rendered from within other templates. They're useful for breaking up complex templates into smaller, more manageable pieces. Layouts are used to provide a common structure to your views. They can include headers, footers, and other recurring elements. Here's an example of a partial: ```erb <!-- _partial.html.erb --> <p>This is a partial</p> ``` ```erb <!-- main.html.erb --> <h1>Main template</h1> <%= render 'partial' %> ``` And here's an example of a layout: ```erb <!-- application.html.erb --> <!DOCTYPE html> <html> <head> <title>My App</title> </head> <body> <header>My App Header</header> <%= yield %> <footer>My App Footer</footer> </body> </html> ``` ### Best Practices and Security Considerations When using ERB templates, there are a few best practices and security considerations to keep in mind: * Always use instance variables (e.g., `@users`) to pass data to your templates. * Use the `render` method to include partials and layouts. * Avoid using ERB to output sensitive data (e.g., passwords or credit card numbers). * Use HTML escaping (e.g., `CGI::escapeHTML`) to prevent XSS attacks. ### Conclusion ERB templates are a powerful feature of Rails that make building dynamic views a breeze. By using ERB syntax, partials, and layouts, you can create complex and scalable web applications with ease. In the next topic, we'll cover understanding Rails form helpers and handling form submissions. Do you have any questions or need help with something? Leave a comment below or [post on the Rails community forum](https://community.rubyonrails.org/). ### Additional Resources * [Rails Guide: Action View](https://guides.rubyonrails.org/action_view_overview.html) * [Rails API: ActionView](https://api.rubyonrails.org/classes/ActionView/Base.html) * [ERb documentation](https://ruby-doc.org/stdlib-2.7.1/libdoc/erb/rdoc/ERb.html)

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Mastering Ruby on Rails: Building Scalable Web Applications

Course

Objectives

  • Understand the Ruby on Rails framework and its conventions.
  • Build full-featured web applications using Rails' MVC architecture.
  • Master database interactions with Active Record and migrations.
  • Develop RESTful APIs using Rails for modern web and mobile apps.
  • Implement security best practices and handle user authentication.
  • Conduct testing using RSpec and other testing frameworks.
  • Deploy Rails applications to cloud platforms (Heroku, AWS, etc.).
  • Utilize version control and CI/CD practices in Rails projects.

Introduction to Ruby on Rails and Development Environment

  • Overview of Ruby and Rails: History and current trends.
  • Setting up the Rails development environment (Ruby, Bundler, Rails gem).
  • Understanding MVC (Model-View-Controller) architecture.
  • Exploring Rails conventions and directory structure.
  • Lab: Set up a Ruby on Rails development environment and create a basic Rails application with simple routes and views.

Routing, Controllers, and Views

  • Defining routes in Rails (RESTful routes).
  • Creating controllers and actions.
  • Building views with Embedded Ruby (ERB) templates.
  • Understanding Rails form helpers and handling form submissions.
  • Lab: Create a simple web application with routing, controllers, and views that display and manage data.

Working with Databases and Active Record

  • Introduction to Rails migrations and schema management.
  • Using Active Record for database interactions.
  • Understanding associations in Active Record (belongs_to, has_many, etc.).
  • Implementing validations and callbacks in models.
  • Lab: Create a database schema for a blog application using migrations and Active Record, implementing associations and validations.

User Authentication and Authorization

  • Implementing user authentication using Devise or similar gems.
  • Understanding session management in Rails.
  • Introduction to authorization (Pundit or CanCanCan).
  • Best practices for securing routes and data.
  • Lab: Build a user authentication system with registration, login, and role-based access control.

RESTful API Development with Rails

  • Introduction to RESTful APIs and best practices.
  • Creating APIs using Rails controllers.
  • Handling JSON requests and responses.
  • API authentication with token-based systems (JWT).
  • Lab: Develop a RESTful API for a task management system with authentication and JSON responses.

Advanced Active Record and Querying

  • Advanced querying techniques with Active Record (scopes, joins).
  • Using eager loading to optimize performance.
  • Working with complex database queries and aggregations.
  • Implementing soft deletes and versioning in models.
  • Lab: Implement advanced Active Record features in an application with multiple models and relationships.

Testing and Debugging in Rails

  • Importance of testing in modern software development.
  • Introduction to RSpec for unit and integration testing.
  • Writing tests for models, controllers, and views.
  • Debugging techniques and using tools like Byebug.
  • Lab: Write unit and integration tests for a Rails application using RSpec.

Background Jobs and Task Scheduling

  • Introduction to background processing in Rails (Sidekiq, Active Job).
  • Creating and managing background jobs.
  • Task scheduling with the Whenever gem.
  • Best practices for handling asynchronous tasks.
  • Lab: Implement background jobs for sending emails or processing data in a Rails application.

File Uploads and Active Storage

  • Handling file uploads in Rails applications.
  • Using Active Storage for managing file uploads.
  • Cloud storage integration (Amazon S3, Google Cloud Storage).
  • Best practices for file handling and storage.
  • Lab: Create a file upload feature using Active Storage to manage user-uploaded images.

Real-Time Applications with ActionCable

  • Introduction to real-time features in Rails with ActionCable.
  • Building chat applications and live notifications.
  • Understanding WebSockets and their use cases in Rails.
  • Handling multiple channels and broadcasting.
  • Lab: Build a real-time chat application using ActionCable for live messaging.

Version Control, Deployment, and CI/CD

  • Introduction to Git and GitHub for version control.
  • Collaborating on Rails projects using branches and pull requests.
  • Deploying Rails applications on Heroku or AWS.
  • Setting up CI/CD pipelines with GitHub Actions or CircleCI.
  • Lab: Deploy a Rails application to Heroku and configure a CI/CD pipeline for automated testing and deployment.

Final Project and Advanced Topics

  • Scaling Rails applications (load balancing, caching strategies).
  • Introduction to microservices architecture with Rails.
  • Best practices for optimizing performance and security in Rails apps.
  • Review and troubleshooting session for final projects.
  • Lab: Begin working on the final project that integrates learned concepts into a full-stack Ruby on Rails web application.

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