How to build a complete, real-world application from scratch with Ruby on Rails step by step.
A lot of Ruby code is "magic". We'll explain the magic and see how it works using the powerful tools Ruby gives us.
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In this lesson, we will look at how to group rows by a given column and then use aggregate functions to perform calculations on the results.
In this lesson, we will look at how to use joins together with group by clauses to group by columns from other tables.
In this lesson, we will look at how to filter the groups resulting from writing group by clauses with the HAVING clause.
In this lesson, we look at the tools we will need to have installed so that we can start on our journey to learning SQL.
Learn how to build custom Turbo Stream Actions to build things like browser notifications, console logging, or anything you want. Plus, we'll look at how Turbo implements this in their GitHub codebase.
Learn how to execute Ruby Scripts and interactively run Ruby code in IRB
Learn how Strings work in Ruby
Learn how to use Integers and Floats in your Ruby code
Learn how to use Arrays in your Ruby code
Learn how to use Hashes in your Ruby code
Conditionals allow your code to take different paths. Learn how to use conditionals like if statements in your Ruby code
A method or function is a way to define a group of code that can be used repeatedly. We'll learn how to define methods in our Ruby code and then use them multiple times.
So far, our project has been a single line of operation. We can refactor this to use methods to reuse code in various ways.
Loops allow you to run code multiple times. This is handy when you need to process a group of items one at a time until the entire group is finished. We'll also learn about Ruby blocks to define the set of operations.
Object oriented programming and Ruby go hand in hand. This lesson, we'll learn how to define classes and create instances of them to organize our code.
We're going to build a Blog with Ruby on Rails so let's start by making sure we have everything installed and create our new Rails app
Now that we've created a new Rails app, let's take a look at the files generated and learn what they do
The first thing we need is a database table to store our blog posts. We create a Rails model (the M in MVC) to create the database and a Ruby class for us to interact with the database table.
An index page allows us to display all the blog posts in our database. We will learn how to setup routes that point to controllers and actions that render HTML.
We need a way to view individual Blog Posts on their own URLs now. That's where our Show action comes into play and we will learn how to build that in this lesson.
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