Delete attachments from storage when their submission are deleted

onadata/apps/logger/__init__.py

@@ -1 +1,12 @@
 # coding: utf-8
+from django.apps import AppConfig
+
+
+class LoggerAppConfig(AppConfig):
+
+    name = 'onadata.apps.logger'
+
+    def ready(self):
+        # Makes sure all signal handlers are connected
+        from onadata.apps.logger import signals
+        super().ready()

onadata/apps/logger/signals.py

@@ -0,0 +1,23 @@
+# coding: utf-8
+import logging
+from django.db.models.signals import pre_delete
+from django.dispatch import receiver
+
+from onadata.apps.logger.models.attachment import Attachment
+
+
+@receiver(pre_delete, sender=Attachment)
+def pre_delete_attachment(instance, **kwargs):
+    # "Model.delete() isn’t called on related models, but the pre_delete and
+    # post_delete signals are sent for all deleted objects." See
+    # https://docs.djangoproject.com/en/2.2/ref/models/fields/#django.db.models.CASCADE
+    # We want to delete all files when an Instance (or Attachment) object is
+    # deleted.
+
+    # `instance` here means "model instance", and no, it is not allowed to
+    # change the name of the parameter
+    attachment = instance
+    try:
+        attachment.media_file.delete()
+    except Exception as e:
+        logging.error('Failed to delete attachment: ' + str(e), exc_info=True)

onadata/apps/logger/xform_instance_parser.py

@@ -332,7 +332,6 @@ def _set_attributes(self):
                 logger = logging.getLogger("console_logger")
                 logger.debug("Skipping duplicate attribute: %s"
                              " with value %s" % (key, value))
-                logger.debug(str(all_attributes))
             else:
                 self._attributes[key] = value
 

onadata/libs/utils/logger_tools.py

@@ -53,7 +53,8 @@
     clean_and_parse_xml,
     get_uuid_from_xml,
     get_deprecated_uuid_from_xml,
-    get_submission_date_from_xml)
+    get_submission_date_from_xml,
+)
 from onadata.apps.main.models import UserProfile
 from onadata.apps.viewer.models.data_dictionary import DataDictionary
 from onadata.apps.viewer.models.parsed_instance import ParsedInstance

onadata/settings/base.py

@@ -211,7 +211,7 @@ def skip_suspicious_operations(record):
     'rest_framework.authtoken',
     'taggit',
     'readonly',
-    'onadata.apps.logger',
+    'onadata.apps.logger.LoggerAppConfig',
     'onadata.apps.viewer',
     'onadata.apps.main',
     'onadata.apps.restservice',

onadata/settings/dev.py

@@ -6,11 +6,6 @@
 # Django Framework settings    #
 ################################
 
-LOGGING['root'] = {
-    'handlers': ['console'],
-    'level': 'DEBUG'
-}
-
 SESSION_ENGINE = "redis_sessions.session"
 SESSION_REDIS = RedisHelper.config(default="redis://redis_cache:6380/2")