From 97582674f8d68cf0c3fb7321f1cfff437eb4ea1b Mon Sep 17 00:00:00 2001
From: Étienne Loks <etienne.loks@iggdrasil.net>
Date: Thu, 27 Jul 2017 11:57:33 +0200
Subject: Fix ParcelField compress method

---
 archaeological_operations/forms.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/archaeological_operations/forms.py b/archaeological_operations/forms.py
index 058e637f4..3c974991f 100644
--- a/archaeological_operations/forms.py
+++ b/archaeological_operations/forms.py
@@ -61,7 +61,7 @@ class ParcelField(forms.MultiValueField):
             self.widget = ParcelWidget()
         return super(ParcelField, self).__init__(*args, **kwargs)
 
-    def compress(data_list):
+    def compress(self, data_list):
         return u"-".join(data_list)
 
 
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