1 files changed, 19 insertions, 0 deletions
diff --git a/ishtar_common/models.py b/ishtar_common/models.py
index a06568d99..36da56cad 100644
--- a/ishtar_common/models.py
+++ b/ishtar_common/models.py
@@ -2688,6 +2688,25 @@ class Town(Imported, models.Model):
         self.save()
         return self.cached_label
 
+    def generate_geo(self):
+        if self.limit:
+            return
+        parents = None
+        if not self.parents.count():
+            return
+        for parent in self.parents.all():
+            if not parent.limit:
+                return
+            if not parents:
+                parents = parent.limit
+            else:
+                parents = parents.union(parent.limit)
+        # if union is a simple polygon make it a multi
+        if 'MULTI' not in parents.wkt:
+            parents = parents.wkt.replace('POLYGON', 'MULTIPOLYGON(') + ")"
+        self.limit = parents
+        return self.limit
+
     def _generate_cached_label(self):
         cached_label = self.name
         if settings.COUNTRY == "fr":