add text field to add comment to ticket

core/tickets/api_v2.py

@@ -88,6 +88,12 @@ class IssueViewSet(viewsets.ModelViewSet):
 
 
 class CommentSerializer(serializers.ModelSerializer):
+
+    def validate(self, attrs):
+        if 'comment' not in attrs or attrs['comment'] == '':
+            raise serializers.ValidationError('comment cannot be empty')
+        return attrs
+
     class Meta:
         model = Comment
         fields = ('id', 'comment', 'timestamp', 'issue_thread')
@@ -176,12 +182,33 @@ def get_available_states(request):
     return Response(get_state_choices())
 
 
+@api_view(['POST'])
+@permission_classes([IsAuthenticated])
+@permission_required('tickets.add_comment', raise_exception=True)
+def add_comment(request, pk):
+    issue = IssueThread.objects.get(pk=pk)
+    if 'comment' not in request.data or request.data['comment'] == '':
+        return Response({'status': 'error', 'message': 'missing comment'}, status=status.HTTP_400_BAD_REQUEST)
+    comment = Comment.objects.create(
+        issue_thread=issue,
+        comment=request.data['comment'],
+    )
+    systemevent = SystemEvent.objects.create(type='comment added', reference=comment.id)
+    channel_layer = get_channel_layer()
+    async_to_sync(channel_layer.group_send)(
+        'general', {"type": "generic.event", "name": "send_message_to_frontend", "event_id": systemevent.id,
+                    "message": "comment added"}
+    )
+    return Response(CommentSerializer(comment).data, status=status.HTTP_201_CREATED)
+
+
 router = routers.SimpleRouter()
 router.register(r'tickets', IssueViewSet, basename='issues')
 router.register(r'comments', CommentViewSet, basename='comments')
 
 urlpatterns = ([
                    re_path(r'^tickets/(?P<pk>\d+)/reply/$', reply, name='reply'),
+                   re_path(r'^tickets/(?P<pk>\d+)/comment/$', add_comment, name='add_comment'),
                    re_path(r'^tickets/manual/$', manual_ticket, name='manual_ticket'),
                    re_path(r'^tickets/states/$', get_available_states, name='get_available_states'),
                ] + router.urls)