(feat) display validation before payment

app/controllers/api/prices_controller.rb

@@ -46,6 +46,9 @@ class API::PricesController < API::ApiController
     cs = CartService.new(current_user)
     cart = cs.from_hash(params)
     @amount = cart.total
+    # TODO, remove this when the cart is refactored
+    cart.valid?
+    @errors = cart.errors
   end
 
   private

app/frontend/src/javascript/directives/cart.js

@@ -687,6 +687,13 @@ Application.Directives.directive('cart', ['$rootScope', '$uibModal', 'dialogs',
               $scope.amountTotal = res.price;
               $scope.schedule.payment_schedule = res.schedule;
               $scope.totalNoCoupon = res.price_without_coupon;
+              if (res.errors && Object.keys(res.errors).length > 0) {
+                for (const error in res.errors) {
+                  for (const message of res.errors[error]) {
+                    growl.error(message);
+                  }
+                }
+              }
               setSlotsDetails(res.details);
             });
           } else {

app/views/api/prices/compute.json.jbuilder

@@ -21,3 +21,4 @@ if @amount[:schedule]
     end
   end
 end
+json.errors @errors