use primaryDomain to query CrUX API

Most shops map custom domains and we should use that to query CrUX API,
since that's what real users hit! Closes #6.

Note: there is no REST API for this? =/

README.md

@@ -6,8 +6,7 @@ Optimizing quality of user experience is critical to the success of every storef
 
 [![CWV for Shopify preview](storage/cwv-shopify-preview.jpg)](storage/cwv-shopify-preview.jpg)
 
-Take it for a spin on your own **development** store: https://core-web-vitals-dashboard.herokuapp.com/login 
-
+Take it for a spin on your own **development** store: https://core-web-vitals-dashboard.herokuapp.com/login
 
 ### Development
 
@@ -24,6 +23,12 @@ Take it for a spin on your own **development** store: https://core-web-vitals-da
    `SHOPORIGIN='https://www.allbirds.com' shopify serve`
 1. Navigate to the tunnel URL and install the dev app on your Shopify store
 
+### Updating GraphQL API version
+
+1. Get token from `@current_shopify_session.domain`
+1. Run the update via
+   `rake shopify_api:graphql:dump API_VERSION=XXXX-XX SHOP_DOMAIN=<DOMAIN> ACCESS_TOKEN=<TOKEN>`
+
 ### Contributing
 
 Have suggestions on how to improve the report, or a feature you'd like to nominate? Head to [Issues](/issues) and start the conversation.

app/controllers/competitors_controller.rb

@@ -2,23 +2,23 @@
 
 class CompetitorsController < AuthenticatedController
   before_action do
-    @shop = Shop.find_by(shopify_domain: @current_shopify_session.domain)
+    @shop = Shop.find_by(shopify_domain: helpers.get_primary_shop_domain)
   end
 
   def show
-    render :json => @shop.competitors
+    render json: @shop.competitors
   end
 
   def create
     @shop.competitors << Competitor.new(origin: params[:origin])
-    render :json => @shop.save
+    render json: @shop.save
   end
 
   def destroy
     if (c = @shop.competitors.find_by(origin: params[:origin]))
-      render :json => c.destroy
+      render json: c.destroy
     else
-      render :json => { :error => "not found" }
+      render json: {error: "not found"}
     end
   end
 end

app/controllers/home_controller.rb

@@ -10,7 +10,7 @@ def index
     # Shopify will invalidate the granted keys.
     @scopes = ShopifyAPI::AccessScope.find(:all)
 
-    @shop = Shop.find_by(shopify_domain: @current_shopify_session.domain)
+    @shop = Shop.find_by(shopify_domain: helpers.get_primary_shop_domain)
     @competitors = @shop.competitors.pluck(:origin)
     @competitors = DEFAULT_COMPETITORS if @competitors.empty?
   end

app/helpers/application_helper.rb

@@ -1,2 +1,20 @@
 module ApplicationHelper
+  SHOP_QUERY = <<-'GRAPHQL'
+    {
+      shop {
+        name,
+        primaryDomain {
+          id,
+          url
+        }
+      }
+    }
+  GRAPHQL
+
+  def get_primary_shop_domain
+    client = ShopifyAPI::GraphQL.client
+    result = client.query(client.parse(SHOP_QUERY))
+
+    URI.parse(result.data.shop.primary_domain.url).host
+  end
 end