1 files changed, 18 insertions, 0 deletions
diff --git a/ishtar/ishtar_base/models.py b/ishtar/ishtar_base/models.py
index 1e9cf9b21..42b79f163 100644
--- a/ishtar/ishtar_base/models.py
+++ b/ishtar/ishtar_base/models.py
@@ -685,6 +685,24 @@ class Operation(BaseHistorizedItem, OwnPerms):
     def is_own(self, person):
         return False
 
+
+    @property
+    def surface_ha(self):
+        if self.surface:
+            return self.surface/10000.0
+
+    @property
+    def cost_by_m2(self):
+        if not self.surface or not self.cost:
+            return
+        return round(float(self.cost)/self.surface, 2)
+
+    @property
+    def cost_by_m2(self):
+        if not self.surface or not self.cost:
+            return
+        return round(float(self.cost)/self.surface, 2)
+
     @classmethod
     def get_query_owns(cls, user):
         return Q(in_charge=user.person)|Q(history_modifier=user)\