feat(Buy): add transaction on buy process.

tienda_ilusion/don_confiao/views.py

@@ -1,8 +1,7 @@
 from django.shortcuts import render
 from django.http import HttpResponse, HttpResponseRedirect, JsonResponse
-from django.template import loader
-from django.core.exceptions import ValidationError
 from django.views.generic import ListView
+from django.db import transaction
 
 from .models import Sale, Product, ProductCategory, Payment
 from .forms import ImportProductsForm, PurchaseForm, SaleLineFormSet, ReconciliationJarForm, PurchaseSummaryForm
@@ -26,6 +25,7 @@ def buy(request):
             sale_summary_form.is_valid()
         ])
         if forms_are_valid:
+            with transaction.atomic():
                 sale = sale_form.save()
                 line_formset.instance = sale
                 line_formset.save()