How to Create a React App with Ruby on Rails

Let’s start by creating a new rails app. However, when we go into our terminal to run rails new appname, we’re going to add webpack right out of the gate and specify react. Enter the following into your CLI in the directory where you want to spin up a new rails app:

These next commands should run automatically, if not though you may need to also add the following:

This will handle the basic install and setup for our new rails/react app. Now we can create a controller with an index page, and set up a root path for our app. Let’s do this by creating a pages controller using rails’ built in controller generator:

Now let’s make our new pages#index into our root path for this app:

config/routes.rb

Next, inside our app’s javascript folder, let’s change the default file from hello.jsx to index.js. Then we can inject our react into our new pages#index view file that was generated when we created our pages controller above:

views/pages/index.html.erb

If we run rails s and navigate to port 3000, we should now have a new root page that says “Hello React!”. Woohoo! We have hooked up react in our rails app! Now let’s create a components folder and add a new App component to our react/rails app:

javascript/components/App.js

Then back in our index.js file, we can bring in our new component:

javascript/packs/index.js

On the front end we should now see this:

Woohoo!

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