Getting from zero to one, quickly

Prerequisite: We assume you have read and followed the installation guide, either in a new or existing Rails application.

Creating your first Matestack app

A matestack app is something like a classic Rails layout. It will wrap pages.

Within your app/matestack/ folder, create a folder called apps and there, we will start by adding a file called my_app.rb! Put the following code inside it:


class Apps::MyApp < Matestack::Ui::App

  def response
    components {
      header do
        heading size: 1, text: "My App"
      main do


Great! Now we have our first matestack app inside our Rails application. It can wrap many pages, and adding a first one is our next step!

Creating your first matestack page

A matestack page is something like a classic Rails view. It will be wrapped by an app.

Now, within app/matestack/, create another folder called pages/, and put a folder for our app in it (my_app). In app/matestack/pages/my_app/, create a file called my_example_page.rb for our first view.

Notice how we describe our User Interface with elements that resemble HTML tags - but we can also write Ruby just the way we want to!


class Pages::MyApp::MyExamplePage < Matestack::Ui::Page

  def response
    components {
      div do
        plain "hello world!"
        5.times do
          plain "Hurray!"


After creating this example page for our example matestack app, we're nearly finished. But as you may have guessed, we've yet to prepare the routes and the controller!

Setting up router and controller

This is straightforward and just works the Rails way.

Inside config/routes.rb, add a route for the example page:

Rails.application.routes.draw do
  get 'my_example_page', to: 'my_app#my_example_page'

In app/controllers/, create a file called my_app_controller.rb and define our action:

class MyAppController < ApplicationController

  # if it is not already included in the ApplicationController
  include Matestack::Ui::Core::ApplicationHelper

  def my_example_page


Test it

All we got left to do is to start Rails by entering rails server in the console and then head to localhost:3000/myexamplepage in our favorite browser!


We have successfully installed the Matestack UI Core gem to a Rails application and can now write our views in pure Ruby!

Even though we have only seen static content in this hello world example, you may already see the potential in this approach - if not, go ahead and see how we can add client side dynamic with other Matestack components!

Next steps

Feel invited to check the other guides for more complex examples or fork our example application to start playing around yourself!