fix subscribe request

app/controllers/subscriptions_controller.rb

@@ -38,7 +38,9 @@ module DiscoursePatrons
           group.add(current_user)
         end
 
-        DiscoursePatrons::Customer.create(user_id: current_user.id, customer_id: params[:customer])
+        unless DiscoursePatrons::Customer.exists?(user_id: current_user.id)
+          DiscoursePatrons::Customer.create(user_id: current_user.id, customer_id: params[:customer])
+        end
 
         render_json_dump @subscription
 

assets/javascripts/discourse/routes/patrons-subscribe.js.es6

@@ -13,8 +13,9 @@ export default Discourse.Route.extend({
     };
 
     const plans = Plan.findAll().then(results =>
-      results.map(p => planSelectText(p))
+      results.map(p => ({ id: p.id, name: planSelectText(p) }))
     );
+
     const subscription = Subscription.create();
 
     return Ember.RSVP.hash({ plans, subscription });

config/routes.rb

@@ -20,4 +20,5 @@ DiscoursePatrons::Engine.routes.draw do
   resources :subscriptions, only: [:index, :create]
 
   get '/' => 'patrons#index'
+  get '/subscribe' => 'patrons#index'
 end

spec/requests/subscriptions_controller_spec.rb

@@ -51,6 +51,15 @@ module DiscoursePatrons
             post "/patrons/subscriptions.json", params: { plan: 'plan_1234', customer: 'cus_1234' }
           }.to change { DiscoursePatrons::Customer.count }
         end
+
+        it "does not create a customer id one existeth" do
+          ::Stripe::Plan.expects(:retrieve).returns(metadata: {})
+          ::Stripe::Subscription.expects(:create).returns(status: 'active')
+          DiscoursePatrons::Customer.create(user_id: user.id, customer_id: 'cus_1234')
+
+          DiscoursePatrons::Customer.expects(:create).never
+          post "/patrons/subscriptions.json", params: { plan: 'plan_1234', customer: 'cus_1234' }
+        end
       end
 
       describe "user groups" do