fix(bases): avoid duplicated part/equipment tags

Avoid reporting duplicated tags when defined on both parent part and
equipment.

fix #77

CHANGELOG.md

@@ -145,6 +145,8 @@ and this project adheres to
     overriden by specialized classes.
   - Fix folded equipment name filtering (#73).
   - Add missing raise instructions in some DB format error cases.
+  - Avoid reporting duplicated tags when defined on both parent part and
+    equipment (#77).
 - web:
   - Send HTTP/400 status code when JSON error instead of crashing with
     exception in case of error when drawing an infrastructure or a room.

racksdb/bases.py

@@ -66,7 +66,10 @@ def tags(self):
         # RacksDB{Node,StorageEquipment,NetworkEquipment,MiscEquipment} loaded tags are
         # renamed with loaded prefix to avoid conflict with this property.
         for tag in getattr(self, f"{self.LOADED_PREFIX}tags", []):
-            result.append(tag)
+            # Avoid duplicate tags that could be defined on both parent part and
+            # equipment.
+            if tag not in result:
+                result.append(tag)
         return result
 
     @cached_property