Add export csv file with event attendees

Author: emillub

lego/apps/events/views.py

@@ -1,3 +1,5 @@
+import csv
+from django.http import HttpResponse
 from django.db import transaction
 from django.db.models import Count, Prefetch, Q
 from django.http import Http404
@@ -203,6 +205,30 @@ def perform_update(self, serializer):
         """
         serializer.save(is_ready=False)
 
+    @decorators.action(detail=True, methods=["GET"])
+    def csv(self, *args, **kwargs):
+        event = Event.objects.get(pk=kwargs["pk"])
+        response = HttpResponse(content_type="text/csv")
+        response["Content-Disposition"] = (
+            f'attachment; filename="{event.title.replace(" ", "_") + "_attendees"}.csv"'
+        )
+        
+        writer = csv.writer(response)
+        writer.writerow(["full_name", "username", "email", "phone", "grade"])
+        for pool in event.pools.all():
+            for participant in pool.registrations.all():
+                writer.writerow(
+                    [
+                        participant.user.get_full_name(),
+                        participant.user.username,
+                        participant.user.email,
+                        participant.user.phone_number,
+                        participant.user.grade,
+                    ]
+                )
+
+        return response
+
     @decorators.action(detail=True, methods=["GET"])
     def administrate(self, request, *args, **kwargs):
         event_id = self.kwargs.get("pk", None)
@@ -334,6 +360,7 @@ def cover_image_gallery(self, request):
         )
         serializer = self.get_serializer(queryset, many=True)
         return Response(serializer.data)
+    
 
 
 class PoolViewSet(