Update relationship extraction to avoid duplicate entries

Author: Julfried

pylint/pyreverse/diagrams.py

@@ -238,35 +238,38 @@ def extract_relationships(self) -> None:
             # Track processed attributes to avoid duplicates
             processed_attrs = set()
 
-            # Composition links
+            # Process in priority order: Composition > Aggregation > Association
+
+            # 1. Composition links (highest priority)
             for name, values in list(node.compositions_type.items()):
+                if not self.show_attr(name):
+                    continue
                 for value in values:
                     self.assign_association_relationship(
                         value, obj, name, "composition"
                     )
                     processed_attrs.add(name)
 
-            # Aggregation links
+            # 2. Aggregation links (medium priority)
             for name, values in list(node.aggregations_type.items()):
+                if not self.show_attr(name) or name in processed_attrs:
+                    continue
                 for value in values:
-                    if not self.show_attr(name):
-                        continue
-
                     self.assign_association_relationship(
                         value, obj, name, "aggregation"
                     )
+                    processed_attrs.add(name)
 
-            # Association links
+            # 3. Association links (lowest priority)
             associations = node.associations_type.copy()
             for name, values in node.locals_type.items():
                 if name not in associations:
                     associations[name] = values
 
             for name, values in associations.items():
+                if not self.show_attr(name) or name in processed_attrs:
+                    continue
                 for value in values:
-                    if not self.show_attr(name):
-                        continue
-
                     self.assign_association_relationship(
                         value, obj, name, "association"
                     )