ratings: fix wrong creation dates

backend/trcustoms/ratings/migrations/0002_auto_20241115_1135.py

@@ -1,8 +1,31 @@
 # Generated by Django 4.2.3 on 2024-11-15 11:35
 
+from contextlib import contextmanager
+
 from django.db import migrations
 
 
+@contextmanager
+def suppress_auto_now(model, field_names):
+    fields_state = {}
+    for field_name in field_names:
+        field = model._meta.get_field(field_name)
+        fields_state[field] = {
+            "auto_now": field.auto_now,
+            "auto_now_add": field.auto_now_add,
+        }
+
+    for field in fields_state:
+        field.auto_now = False
+        field.auto_now_add = False
+    try:
+        yield
+    finally:
+        for field, state in fields_state.items():
+            field.auto_now = state["auto_now"]
+            field.auto_now_add = state["auto_now_add"]
+
+
 def forward_func(apps, schema_editor):
     RatingClass = apps.get_model("common", "RatingClass")
     ReviewTemplateQuestion = apps.get_model(
@@ -71,15 +94,16 @@ def forward_func(apps, schema_editor):
 
     # Bulk create Ratings
     print("Creating reviews")
-    Rating.objects.bulk_create(rating_instances)
+    with suppress_auto_now(Rating, ["created", "last_updated"]):
+        Rating.objects.bulk_create(rating_instances)
 
     # Set many-to-many relations for answers
     print("Mapping answers")
     through_model = Rating.answers.through
     m2m_relations = []
-    for review in Review.objects.all():
+    for review in Review.objects.prefetch_related("answers").iterator():
         new_rating_id = review.id
-        for answer in review.answers.all():
+        for answer in review.answers.iterator():
             m2m_relations.append(
                 through_model(
                     rating_id=new_rating_id,