Finds: delete associated treatment on find deletion (refs #3723)

1 files changed, 17 insertions, 1 deletions

diff --git a/archaeological_finds/models_finds.py b/archaeological_finds/models_finds.py
index 78280bede..bc96ded25 100644
--- a/archaeological_finds/models_finds.py
+++ b/archaeological_finds/models_finds.py
@@ -24,7 +24,8 @@ from django.contrib.gis.db import models
 from django.core.urlresolvers import reverse
 from django.db import connection, transaction
 from django.db.models import Max, Q
-from django.db.models.signals import m2m_changed, post_save, post_delete
+from django.db.models.signals import m2m_changed, post_save, post_delete, \
+    pre_delete
 from django.utils.translation import ugettext_lazy as _, ugettext
 
 from ishtar_common.utils import cached_label_changed, post_save_point
@@ -1102,7 +1103,22 @@ class Find(ValueGetter, BaseHistorizedItem, ImageModel, OwnPerms,
         Dating.fix_dating_association(self)
 
 
+def pre_clean_treatments(sender, **kwargs):
+    if not kwargs.get('instance'):
+        return
+    instance = kwargs.get('instance')
+    if instance.downstream_treatment:
+        # TODO: not managed for now. Raise an error?
+        return
+    if not instance.upstream_treatment:
+        return
+    instance.upstream_treatment.upstream.clear()
+    instance.upstream_treatment.downstream.clear()
+    instance.upstream_treatment.delete()
+
+
 post_save.connect(cached_label_changed, sender=Find)
+pre_delete.connect(pre_clean_treatments, sender=Find)
 
 
 def base_find_find_changed(sender, **kwargs):