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All books ▸ Rails Companion ▸ Understanding the Concept of a Middleware

Understanding the Concept of a Middleware

Rails Companion

Setup Project Directory

Install Puma App Server

Install the Rack Gem

Create a Web Application

Run the Application

Reload App when the Code Changes

Understanding Rack: Protocol and Gem

The Rack Protocol

Middleware Toolbox

Tools to Build Rack Apps + Middleware

The Rackup Command

Build Your Own Router in Ruby

What's a Router?

The Router Class

Using the Router

Step 1: Refactor the Router

Step 2: Create the Routes

Step 3: Update the App to Use New Routes

Pass HTTP Environment (Request to Routes)

Let's Implement the Controllers

What We'll Build

Step 1: Create a Controller Class

Step 2: Update the Router

Step 3: Add the Route

Refactoring: Extract Constructor to Base Controller

Serving Static Files

Separate View from Application

Make it Pretty with CSS

Serve Static Files via Middleware

Understanding the Concept of Binding

Using ERB with Binding

Step 1: Add a Render Method on Controller

Step 2: Render from Router

Create a View Template

Implement Logging

Logging in Ruby

Logging to a Log File

Log File Rotation

Adding Logging to Our Ruby App

Models and Autoloading with Zeitwerk

Why Use Models?

Let's Add Models

Introduction to Zeitwerk

Using Zeitwerk to Load Constants

How Rails Configures Zeitwerk

Understanding the Concept of a Middleware

What is Middlware?

Why Use Middlware?

Let's Add Custom Middleware in Rails

Extract Logging Middleware

Next: Introduction