Attach generic references to normalized objects

dns_sync/adapters.py

@@ -110,11 +110,35 @@ class ObjectReference:
             object.__setattr__(self, "logical_key", logical_key)
 
 
+def _normalized_references(
+    references,
+) -> tuple[ObjectReference, ...]:
+    normalized = tuple(references)
+    if any(
+        not isinstance(reference, ObjectReference)
+        for reference in normalized
+    ):
+        raise ValueError(
+            "Object references must be ObjectReference instances"
+        )
+    if len(set(normalized)) != len(normalized):
+        raise ValueError("Object references cannot contain duplicates")
+    return normalized
+
+
 @dataclass(frozen=True)
 class DiscoveredObject:
     object_type: str
     local_key: str
     payload: Mapping[str, Any]
+    references: tuple[ObjectReference, ...] = ()
+
+    def __post_init__(self) -> None:
+        object.__setattr__(
+            self,
+            "references",
+            _normalized_references(self.references),
+        )
 
 
 @dataclass(frozen=True)
@@ -123,6 +147,14 @@ class NormalizedObject:
     logical_key: str
     payload: Mapping[str, Any]
     local_key: str | None = None
+    references: tuple[ObjectReference, ...] = ()
+
+    def __post_init__(self) -> None:
+        object.__setattr__(
+            self,
+            "references",
+            _normalized_references(self.references),
+        )
 
 
 @dataclass(frozen=True)