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-rw-r--r--archaeological_files/models.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/archaeological_files/models.py b/archaeological_files/models.py
index 3237f594c..51273a17e 100644
--- a/archaeological_files/models.py
+++ b/archaeological_files/models.py
@@ -227,6 +227,12 @@ class EquipmentServiceCost(models.Model):
lbl += " - " + str(DCT_ES_UNITS[self.unit])
return lbl
+ def natural_key(self):
+ return (self.slug,)
+
+ def history_compress(self):
+ return self.slug
+
class FileType(GeneralType):
class Meta: