backend returns if user is already subscribed

app/controllers/products_controller.rb

@@ -38,8 +38,16 @@ module DiscoursePatrons
       {
         id: product[:id],
         name: product[:name],
-        description: product[:metadata][:description]
+        description: product[:metadata][:description],
+        subscribed: current_user_products.include?(product[:id])
       }
     end
+
+    def current_user_products
+      ::DiscoursePatrons::Customer
+        .select(:product_id)
+        .where(user_id: current_user.id)
+        .map { |c| c.product_id }.compact
+    end
   end
 end

app/controllers/subscriptions_controller.rb

@@ -40,9 +40,11 @@ module DiscoursePatrons
           group.add(current_user)
         end
 
-        unless DiscoursePatrons::Customer.exists?(user_id: current_user.id)
-          DiscoursePatrons::Customer.create(user_id: current_user.id, customer_id: params[:customer])
-        end
+        DiscoursePatrons::Customer.create(
+          user_id: current_user.id,
+          customer_id: params[:customer],
+          product_id: plan[:product]
+        )
 
         render_json_dump @subscription
 

db/migrate/20191127233735_add_product_to_customer.rb

@@ -0,0 +1,5 @@
+class AddProductToCustomer < ActiveRecord::Migration[6.0]
+  def change
+    add_column :discourse_patrons_customers, :product_id, :string
+  end
+end

db/migrate/20191128044206_remove_customer_index.rb

@@ -0,0 +1,5 @@
+class RemoveCustomerIndex < ActiveRecord::Migration[6.0]
+  def change
+    remove_index :discourse_patrons_customers, :customer_id
+  end
+end

spec/requests/products_controller_spec.rb

@@ -4,6 +4,9 @@ require 'rails_helper'
 
 module DiscoursePatrons
   RSpec.describe ProductsController do
+    context "authenticated" do
+      let(:user) { Fabricate(:user) }
+
       let(:product) do
         {
           id: "prodct_23456",
@@ -15,6 +18,10 @@ module DiscoursePatrons
         }
       end
 
+      before do
+        sign_in(user)
+      end
+
       describe "index" do
         it "gets products" do
           ::Stripe::Product.expects(:list).with(active: true).returns(data: [product])
@@ -24,9 +31,28 @@ module DiscoursePatrons
           expect(JSON.parse(response.body)).to eq([{
             "id" => "prodct_23456",
             "name" => "Very Special Product",
-          "description" => "Many people listened to my phone call with the Ukrainian President while it was being made"
+            "description" => "Many people listened to my phone call with the Ukrainian President while it was being made",
+            "subscribed" => false
           }])
         end
+
+        it "is subscribed" do
+          ::DiscoursePatrons::Customer.create(product_id: product[:id], user_id: user.id, customer_id: 'x')
+          ::Stripe::Product.expects(:list).with(active: true).returns(data: [product])
+
+          get "/patrons/products.json"
+          data = JSON.parse(response.body)
+          expect(data.first["subscribed"]).to eq true
+        end
+
+        it "is not subscribed" do
+          ::DiscoursePatrons::Customer.delete_all
+          ::Stripe::Product.expects(:list).with(active: true).returns(data: [product])
+
+          get "/patrons/products.json"
+          data = JSON.parse(response.body)
+          expect(data.first["subscribed"]).to eq false
+        end
       end
 
       describe 'show' do
@@ -37,9 +63,11 @@ module DiscoursePatrons
           expect(JSON.parse(response.body)).to eq(
             "id" => "prodct_23456",
             "name" => "Very Special Product",
-          "description" => "Many people listened to my phone call with the Ukrainian President while it was being made"
+            "description" => "Many people listened to my phone call with the Ukrainian President while it was being made",
+            "subscribed" => false
           )
         end
       end
     end
+  end
 end

spec/requests/subscriptions_controller_spec.rb

@@ -21,13 +21,20 @@ module DiscoursePatrons
 
       describe "create" do
         it "creates a subscription" do
-          ::Stripe::Plan.expects(:retrieve).returns(metadata: { group_name: 'awesome' })
+          ::Stripe::Plan.expects(:retrieve).returns(
+            product: 'product_12345',
+            metadata: { group_name: 'awesome' }
+          )
+
           ::Stripe::Subscription.expects(:create).with(
             customer: 'cus_1234',
             items: [ plan: 'plan_1234' ],
             metadata: { user_id: user.id, username: user.username_lower },
-          )
+          ).returns(status: 'active')
+
+          expect {
             post "/patrons/subscriptions.json", params: { plan: 'plan_1234', customer: 'cus_1234' }
+          }.to change { DiscoursePatrons::Customer.count }
         end
 
         it "creates a customer model" do