Allow linked tags to have cyclic dependancies

boards/models.py

@@ -188,18 +188,20 b' class Tag(models.Model):'
 
         return reply_count
 
-    def get_linked_tags(self):
-        linked_tags = []
-
+    def get_linked_tags(self, tag_list=[]):
+        """
+        Returns the list of tags linked to current. The list can be got
+        through returned value or tag_list parameter
+        """
+        
         linked_tag = self.linked
-        if linked_tag:
-            linked_tags.append(linked_tag)
+
+        if linked_tag and not (linked_tag in tag_list):
+            tag_list.append(linked_tag)
 
-            far_tags = linked_tag.get_linked_tags()
-            if len(far_tags) > 0:
-                linked_tags.extend(far_tags)
+            linked_tag.get_linked_tags(tag_list)
 
-        return linked_tags
+        return tag_list
 
 
 class Post(models.Model):