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All LessonsFree Lessons (2)

Getting Started

Introduction to the Course Course Organization and Tools

Instant Gratification

Creating a New Application Hello Rails Using a Custom Controller Adding Dynamic Content in Actions Linking Page Together When Things Go Wrong Summary Quiz Yourself on Rails Basic Application

The Architecture of Rails Application

Models, Views and Controllers Rails Model Support Action Pack: The View and Controller Summary Quiz Yourself on the Architecture of Rails Application

Introduction to Ruby

Ruby is an Object-Oriented Language

Organizing Structures

Marshaling Objects

Pulling It All Together

Quiz Yourself on the Introduction to Ruby

The Depot Application

Incremental Development What Depot Does Let's Code

Creating the Application

Creating the Product Maintenance Application Making Prettier Listings Summary Quiz Yourself on Creating the Application

Validation and Unit Testing

Validating Unit Testing Making Test Fixtures Use of Fixtures Data in Tests Summary Quiz Yourself on Validating and Unit Testing

Catalog Display

Creating the Catalog Listing Adding the Page Layout Using a Helper to Format the Price Functional Testing of Controllers Caching of Partial Results Summary Quiz Yourself on Catalog Display

Cart Creation

Finding a Cart Connecting Products to Cart Running a Test Fixture on Cart Products Adding a Button Making Button Functional Making Cart a Little Prettier A Product Test Fixture Summary Quiz Yourself on Cart Creation

A Smarter Cart

Iteration 1: Creating a Smarter Cart Iteration 2: Creating a Smarter Cart Iteration 3: Creating a Smarter Cart Handling Errors Finishing the Cart Summary Quiz Yourself on A Smarter Cart

Adding a Dash of Ajax

Moving the Cart Creating an Ajax-based cart Highlighting Changes Hiding an Empty Cart with a Custom Helper Broadcasting Updates with Action Cable Summary Quiz Yourself on Adding a Dash of Ajax

Check Out

Capturing an Order Capturing the Order Details Atom Feeds Summary Quiz Yourself on Checking Out

Entering Additional Payment Details

Installing and Testing React Learning Just Enough React Dynamically Replacing Components Based on User Actions Testing our JavaScript Functionality Summary Quiz Yourself on Entering Additional Payment Details

Sending Emails and Processing Payments Efficiently

Sending Confirmation Emails Connecting to a Slow Payment Processor with Active Job System Testing the Checkout Flow Summary Quiz Yourself on Sending Confirmation Emails

Logging In

Adding Users Authenticating Users Limiting Access Adding more Administration Using a Sidebar Summary Quiz Yourself on Logging In

Internationalization

Selecting the Locale Translating the StoreFront Translating Checkout Adding a Locale Switcher Summary Quiz Yourself on Internationalization

Receive Emails and Respond with Rich Text

Receiving Support Emails with Action Mailbox Storing Support Requests from Our Mailbox Responding with Rich Text Summary Quiz Yourself on Receiving and Responding Emails

Finding Your Ways Around Rails

Where Things Go Naming Conventions Summary Quiz Yourself on Finding Your Ways Around Rails

Active Record

Defining Your Data Locating and Traversing Records Creating and Updating Reading and Deleting Participating in the Monitoring Process Transactions Summary Quiz Yourself on Active Record

Action Dispatch and Action Controller

Dispatching Requests Through REST A Bit More on Dispatching Requests Processing of Requests Processing of Redirects Iteration 1: Objects and Operations That Spam Requests Iteration 2: Objects and Operations That Spam Requests Summary Quiz Yourself on Action Dispatch and Action Controller

Action View

Using Templates Generating Forms Processing Forms Uploading Files to Rails Applications Using Helpers Reducing Maintenance with Layouts Reducing Maintenance with Partials Summary Quiz Yourself on Action View

Migrations

Creating and Running Migrations Anatomy of a Migration Managing Tables Advanced Migrations When Migrations Go Bad Summary Quiz Yourself on Migrations

Customizing and Extending Rails

Testing with RSpec Creating HTML Templates with Slim Serving CSS via Webpack Customizing Rails in Other Ways Summary Quiz Yourself on Customizing and Extending Rails

Conclusion

Where to Go from Here

Appendix

Installing Rails on Windows Installing Rails on macOS Installing Rails on Linux Choosing a Rails Version Setting Up Your Development Environment Rails and Databases Summary

Agile Web Development Using Rails 6/

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Organizing Structures

Organizing Structures

Get familiar with Ruby's classes and modules

We'll cover the following...

Classes
Modules
YAML

Ruby has two basic concepts for organizing methods: classes and modules. We will cover each in turn.

Classes

Here’s a Ruby class definition:

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class Order < ApplicationRecord 
  has_many :line_items
  def self.find_all_unpaid
    self.where('paid = 0') 
  end
  def total
    sum = 0
    line_items.each {|li| sum += li.total} 
    sum
  end 
end

Class definitions start with the class keyword, followed by the class name (which must start with an uppercase letter). This Order class is defined as a subclass of the ApplicationRecord class.

Rails makes heavy use of class-level declarations. Here, has_many in line 2 is a method that’s defined by Active Record. It’s called “The definition of Order class”. Normally these kinds of methods make assertions about the class, so in this course we ...