This is a demo eCommerce application to show how you can integrate Elm with Rails

• Postgres
• Ruby 2.3 (may work with earlier versions, but not tested)
• Elm 0.18

Assuming you have all the above, you can first create your database and populate it with some products:

rake db:setup

Start your server with:

rails s

Then visit localhost:3000 in your browser and you should be able to start adding items to your cart.

The elm files are located in app/assets/elm.

Elm tests are located in spec/elm.

First install the headless test runner:

npm install -g elm-test

Then run elm-test spec/elm/Main.elm from the project root.

While you will be able to add and remove items from the cart, the checkout form depends on integration with Stripe. If you create an account with Stripe and get test keys, you'll be able to use the checkout form by providing your API keys to the application as environment variables (remember to use TEST keys when playing with the app in development):

STRIPE_PUBLISHABLE_KEY="<Your publishable key>" STRIPE_KEY="<Your API key>" rails s

Stripe provides some test credit cards that will behave in a predictable way when using TEST API keys:

• 4242424242424242 : Successful payment (use a valid expiry date in the future and any CVC code)
• 4000000000000002 : Card declined

Others can be found in the Stripe documentation.