fix type error on inst to pd with single prop and expand True (#1947)

CHANGELOG.md

@@ -17,6 +17,10 @@ Changes are grouped as follows
 - `Fixed` for any bug fixes.
 - `Security` in case of vulnerabilities.
 
+## [7.62.6] - 2024-09-27
+### Fixed
+- Instances with a single property no longer fail `to_pandas()` with `TypeError`, when using expand_properties=True.
+
 ## [7.62.5] - 2024-09-26
 ### Added
 - Add new `client.workflows.triggers.upsert`, this allows upserts of triggers.
@@ -26,7 +30,7 @@ Changes are grouped as follows
 ## [7.62.4] - 2024-09-25
 ### Fixed
 - In the CoreModel, `client.data_classes.data_modeling.cdm` the fields `isUploaded` and `uploadedTime` in
-  `CogniteFile` are  now considered read-only 
+  `CogniteFile` are  now considered read-only
 
 ## [7.62.3] - 2024-09-24
 ### Added
@@ -38,7 +42,7 @@ Changes are grouped as follows
 
 ## [7.62.1] - 2024-09-23
 ### Changed
-- Support for `OAuthDeviceCode` now supports non Entra IdPs 
+- Support for `OAuthDeviceCode` now supports non Entra IdPs
 
 ## [7.62.0] - 2024-09-19
 ### Added

cognite/client/_version.py

@@ -1,4 +1,4 @@
 from __future__ import annotations
 
-__version__ = "7.62.5"
+__version__ = "7.62.6"
 __api_subversion__ = "20230101"

cognite/client/data_classes/data_modeling/instances.py

@@ -472,7 +472,7 @@ def to_pandas(  # type: ignore [override]
                     "Can't remove view ID prefix from expanded property rows as source was not unique",
                     RuntimeWarning,
                 )
-        return pd.concat((col, prop_df.T.squeeze())).to_frame(name="value")
+        return pd.concat((col, prop_df.T.squeeze(axis=1))).to_frame(name="value")
 
     @abstractmethod
     def as_apply(self) -> InstanceApply:

pyproject.toml

@@ -1,7 +1,7 @@
 [tool.poetry]
 name = "cognite-sdk"
 
-version = "7.62.5"
+version = "7.62.6"
 description = "Cognite Python SDK"
 readme = "README.md"
 documentation = "https://cognite-sdk-python.readthedocs-hosted.com"

tests/tests_unit/test_data_classes/test_data_models/test_instances.py

@@ -481,6 +481,30 @@ def test_expand_properties__list_class_empty_properties(
 
         assert "properties" not in expanded_with_empty_properties.columns
 
+    def test_node_with_single_property_to_pandas_with_expand_props(self) -> None:
+        # Bug prior to 7.62.6 made to_pandas(expand_properties=True) fail on nodes with a single property
+        # due to how squeeze works in pandas, even a DataFrame will be forced into a scalar (to be fair,
+        # the documentation is very clear on this).
+        node = Node.load(
+            {
+                "space": "DEMO_AppData",
+                "externalId": "15777214-1234-4321-1234-02f7b4cd349d",
+                "version": 888,
+                "lastUpdatedTime": 1694611301244,
+                "createdTime": 1685430260401,
+                "instanceType": "node",
+                "properties": {"DEMO_AppData": {"APM_User/15": {"name": "Foo Bar"}}},
+            }
+        )
+        # This has always worked, and should continue to work after the fix
+        node_df1 = node.to_pandas(expand_properties=False)
+        assert node_df1.at["properties", "value"] == {"DEMO_AppData": {"APM_User/15": {"name": "Foo Bar"}}}
+
+        # This failed prior to 7.62.6:
+        node_df2 = node.to_pandas(expand_properties=True)
+        assert "properties" not in node_df2.index
+        assert node_df2.at["name", "value"] == "Foo Bar"
+
 
 class TestTypeInformation:
     @pytest.mark.dsl