Can't display/access products with Rails

So this is my Products controller

class ProductsController < AuthenticatedController
  def index
     = ShopifyAPI::Product.find(:all, params: { limit: 10 })
    render(json: { products:  })
  end
end

And this is how I want to display the products in views/products/index.html.erb:

## Products
<% .each do |p| %>
  

<%= p.title %>

<% end %>

And my route:

get '/products', :to => 'products#index'

But when I redirect my page to /products, I get this message:

Which doesn’t happen with all my other routes, so what am I doing wrong? Am I missing something?