[Feature] Package Export/Import (#116)

Fixes #90
Fixes #91
Fixes #115
Fixes #104

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#116

epdb/signals.py

@@ -1,8 +1,15 @@
+import logging
+import os
+import shutil
+
+from django.conf import settings as s
 from django.db import transaction
-from django.db.models.signals import pre_delete
+from django.db.models.signals import pre_delete, post_delete
 from django.dispatch import receiver
 
-from epdb.models import Node, Edge
+from epdb.models import Node, Edge, EPModel
+
+logger = logging.getLogger(__name__)
 
 
 @receiver(pre_delete, sender=Node)
@@ -18,3 +25,14 @@ def delete_orphan_edges(sender, instance, **kwargs):
         # check if the node that is about to be deleted is the only start node
         if edge.end_nodes.count() == 1:
             edge.delete()
+
+
+@receiver(post_delete, sender=EPModel)
+def delete_epmodel_files(sender, instance, **kwargs):
+    # Delete the files on disk for the deleted model
+    mod_uuid = str(instance.uuid)
+
+    for f in os.listdir(s.MODEL_DIR):
+        if f.startswith(mod_uuid):
+            logger.info(f"Deleting {os.path.join(s.MODEL_DIR, f)}")
+            shutil.rmtree(os.path.join(s.MODEL_DIR, f))