Fix Object TTL schema export to match server json

integration/test_collection_config.py

@@ -7,6 +7,7 @@
 import weaviate
 import weaviate.classes as wvc
 from integration.conftest import (
+    ClientFactory,
     CollectionFactory,
     OpenAICollection,
     _sanitize_collection_name,
@@ -1950,3 +1951,91 @@ def test_object_ttl_update(collection_factory: CollectionFactory) -> None:
     )
     conf = collection.config.get()
     assert conf.object_ttl_config is None
+
+
+def test_object_ttl_roundtrip_from_dict(
+    collection_factory: CollectionFactory, client_factory: ClientFactory
+) -> None:
+    dummy = collection_factory("dummy")
+    if dummy._connection._weaviate_version.is_lower_than(1, 35, 0):
+        pytest.skip("object ttl is not supported in Weaviate versions lower than 1.35.0")
+
+    client = client_factory()
+
+    # (schema_to_create, expected_object_ttl_config_dict)
+    test_cases = [
+        # deleteOn: _creationTimeUnix
+        (
+            {
+                "class": "CollectionTTLRoundtripCreation",
+                "objectTtlConfig": {
+                    "enabled": True,
+                    "defaultTtl": 60,
+                    "deleteOn": "_creationTimeUnix",
+                    "filterExpiredObjects": True,
+                },
+            },
+            {
+                "enabled": True,
+                "defaultTtl": 60,
+                "deleteOn": "_creationTimeUnix",
+                "filterExpiredObjects": True,
+            },
+        ),
+        # deleteOn: _lastUpdateTimeUnix
+        (
+            {
+                "class": "CollectionTTLRoundtripUpdate",
+                "objectTtlConfig": {
+                    "enabled": True,
+                    "defaultTtl": 3600,
+                    "deleteOn": "_lastUpdateTimeUnix",
+                    "filterExpiredObjects": True,
+                },
+            },
+            {
+                "enabled": True,
+                "defaultTtl": 3600,
+                "deleteOn": "_lastUpdateTimeUnix",
+                "filterExpiredObjects": True,
+            },
+        ),
+        # deleteOn: custom date property
+        (
+            {
+                "class": "CollectionTTLRoundtripDateProp",
+                "properties": [
+                    {
+                        "name": "reference_date",
+                        "dataType": ["date"],
+                    }
+                ],
+                "objectTtlConfig": {
+                    "enabled": True,
+                    "defaultTtl": 123,
+                    "deleteOn": "reference_date",
+                    "filterExpiredObjects": True,
+                },
+            },
+            {
+                "enabled": True,
+                "defaultTtl": 123,
+                "deleteOn": "reference_date",
+                "filterExpiredObjects": True,
+            },
+        ),
+    ]
+
+    for schema, expected_ttl_dict in test_cases:
+        name = schema["class"]
+        client.collections.delete(name)
+        try:
+            client.collections.create_from_dict(schema)
+            config = client.collections.export_config(name)
+            assert config.object_ttl_config is not None, f"object_ttl_config is None for {name}"
+            assert config.object_ttl_config.to_dict() == expected_ttl_dict, (
+                f"Round-trip mismatch for {name}: "
+                f"got {config.object_ttl_config.to_dict()}, expected {expected_ttl_dict}"
+            )
+        finally:
+            client.collections.delete(name)

test/collection/test_config.py

@@ -16,6 +16,7 @@
     _RerankerProvider,
     _VectorizerConfigCreate,
 )
+from weaviate.collections.classes.config_methods import _get_object_ttl_config
 from weaviate.collections.classes.config_named_vectors import _NamedVectorConfigCreate
 from weaviate.collections.classes.config_vectorizers import (
     Multi2VecField,
@@ -2621,9 +2622,9 @@ def test_config_with_vectors(vector_config: List[_VectorConfigCreate], expected:
         ),
         {
             "enabled": True,
-            "timeToLive": 86400,
+            "defaultTtl": 86400,
             "filterExpiredObjects": True,
-            "deleteOn": "creationTime",
+            "deleteOn": "_creationTimeUnix",
         },
     ),
     # delete_by_update_time
@@ -2636,9 +2637,9 @@ def test_config_with_vectors(vector_config: List[_VectorConfigCreate], expected:
         ),
         {
             "enabled": True,
-            "timeToLive": 604800,
+            "defaultTtl": 604800,
             "filterExpiredObjects": False,
-            "deleteOn": "updateTime",
+            "deleteOn": "_lastUpdateTimeUnix",
         },
     ),
     # delete_by_date_property
@@ -2651,7 +2652,7 @@ def test_config_with_vectors(vector_config: List[_VectorConfigCreate], expected:
         ),
         {
             "enabled": True,
-            "timeToLive": 5400,
+            "defaultTtl": 5400,
             "filterExpiredObjects": True,
             "deleteOn": "releaseDate",
         },
@@ -2667,7 +2668,7 @@ def test_config_with_vectors(vector_config: List[_VectorConfigCreate], expected:
         {
             "enabled": True,
             "filterExpiredObjects": False,
-            "deleteOn": "creationTime",
+            "deleteOn": "_creationTimeUnix",
         },
     ),
     # negative offset (delete_by_date_property with offset before date)
@@ -2680,7 +2681,7 @@ def test_config_with_vectors(vector_config: List[_VectorConfigCreate], expected:
         ),
         {
             "enabled": True,
-            "timeToLive": -3600,
+            "defaultTtl": -3600,
             "filterExpiredObjects": True,
             "deleteOn": "eventDate",
         },
@@ -2694,6 +2695,45 @@ def test_object_ttl_config_to_dict(ttl_config: _ObjectTTLConfig, expected: dict)
     assert ttl_config.to_dict() == expected
 
 
+TEST_OBJECT_TTL_ROUNDTRIP_PARAMETERS = [
+    # _creationTimeUnix round-trip
+    {
+        "objectTtlConfig": {
+            "enabled": True,
+            "defaultTtl": 60,
+            "deleteOn": "_creationTimeUnix",
+            "filterExpiredObjects": True,
+        }
+    },
+    # _lastUpdateTimeUnix round-trip
+    {
+        "objectTtlConfig": {
+            "enabled": True,
+            "defaultTtl": 3600,
+            "deleteOn": "_lastUpdateTimeUnix",
+            "filterExpiredObjects": True,
+        }
+    },
+    # custom date property round-trip
+    {
+        "objectTtlConfig": {
+            "enabled": True,
+            "defaultTtl": 123,
+            "deleteOn": "reference_date",
+            "filterExpiredObjects": True,
+        }
+    },
+]
+
+
+@pytest.mark.parametrize("schema", TEST_OBJECT_TTL_ROUNDTRIP_PARAMETERS)
+def test_object_ttl_config_roundtrip(schema: dict) -> None:
+    """Test that deserializing an objectTtlConfig and calling to_dict() produces the original dict."""
+    ttl_config = _get_object_ttl_config(schema)
+    assert ttl_config is not None
+    assert ttl_config.to_dict() == schema["objectTtlConfig"]
+
+
 def test_nested_property_with_id_name_is_allowed() -> None:
     """A nested property named 'id' must not raise — only top-level 'id' is reserved."""
     prop = Property(

weaviate/collections/classes/config.py

@@ -1938,6 +1938,22 @@ class _ObjectTTLConfig(_ConfigBase):
     filter_expired_objects: bool
     delete_on: Union[str, Literal["updateTime"], Literal["creationTime"]]
 
+    def to_dict(self) -> dict:
+        delete_on = self.delete_on
+        if delete_on == "creationTime":
+            delete_on = "_creationTimeUnix"
+        elif delete_on == "updateTime":
+            delete_on = "_lastUpdateTimeUnix"
+
+        out: dict = {
+            "enabled": self.enabled,
+            "filterExpiredObjects": self.filter_expired_objects,
+            "deleteOn": delete_on,
+        }
+        if self.time_to_live is not None:
+            out["defaultTtl"] = int(self.time_to_live.total_seconds())
+        return out
+
 
 ObjectTTLConfig = _ObjectTTLConfig