feat: 이벤트 일자에 대한 검증 추가

Author: MU-Software

app/admin_api/serializers/event/event.py

@@ -18,11 +18,16 @@ class Meta:
             "stats_end_date",
         )
 
+    DATE_ORDER_PAIRS = (
+        ("event_start_at", "event_end_at", "event의 종료 날짜는 시작 날짜보다 이전일 수 없습니다."),
+        ("stats_start_date", "stats_end_date", "통계 종료일은 시작일보다 이전일 수 없습니다."),
+    )
+
     def validate(self, attrs: dict) -> dict:
         merged = {**attrs}
-        for field in ("stats_start_date", "stats_end_date"):
-            merged.setdefault(field, getattr(self.instance, field, None))
-        start, end = merged["stats_start_date"], merged["stats_end_date"]
-        if start and end and start > end:
-            raise serializers.ValidationError({"stats_end_date": "통계 종료일은 시작일보다 이전일 수 없습니다."})
+        for start_field, end_field, msg in self.DATE_ORDER_PAIRS:
+            start = merged.setdefault(start_field, getattr(self.instance, start_field, None))
+            end = merged.setdefault(end_field, getattr(self.instance, end_field, None))
+            if start and end and start > end:
+                raise serializers.ValidationError({end_field: msg})
         return attrs

app/admin_api/test/event/event_test.py

@@ -1,6 +1,7 @@
-from datetime import date
+from datetime import date, datetime
 
 from admin_api.serializers.event.event import EventAdminSerializer
+from core.const.datetime import KST
 from model_bakery import baker
 
 
@@ -27,3 +28,26 @@ def test_admin_serializer_rejects_inverted_stats_period(db):
     )
     assert not serializer.is_valid()
     assert "stats_end_date" in serializer.errors
+
+
+def test_admin_serializer_rejects_inverted_event_dates(db):
+    event = baker.make("event.Event")
+    serializer = EventAdminSerializer(
+        instance=event,
+        data={"event_start_at": "2026-08-16T00:00:00+09:00", "event_end_at": "2026-08-14T00:00:00+09:00"},
+        partial=True,
+    )
+    assert not serializer.is_valid()
+    assert "event_end_at" in serializer.errors
+
+
+def test_admin_serializer_rejects_event_end_before_existing_start(db):
+    """partial update: 기존 instance 의 시작일과 비교해 역전 감지."""
+    event = baker.make("event.Event", event_start_at=datetime(2026, 8, 16, tzinfo=KST))
+    serializer = EventAdminSerializer(
+        instance=event,
+        data={"event_end_at": "2026-08-14T00:00:00+09:00"},
+        partial=True,
+    )
+    assert not serializer.is_valid()
+    assert "event_end_at" in serializer.errors