test(python): Fix pydantic model_fields deprecation (#21958)

nameexhaustion · web-flow · commit cc1d07a58e9f · 2025-03-28T08:54:28.000+01:00
diff --git a/py-polars/polars/_utils/construction/dataframe.py b/py-polars/polars/_utils/construction/dataframe.py
@@ -846,7 +846,9 @@ def _sequence_of_pydantic_models_to_pydf(
 
     old_pydantic = parse_version(pydantic.__version__) < (2, 0)
     model_fields = list(
-        first_element.__fields__ if old_pydantic else first_element.model_fields
+        first_element.__fields__
+        if old_pydantic
+        else first_element.__class__.model_fields
     )
     (
         unpack_nested,

Original file line number	Diff line number	Diff line change
`@@ -846,7 +846,9 @@ def _sequence_of_pydantic_models_to_pydf(`
`846`	`846`
`847`	`847`	`old_pydantic = parse_version(pydantic.__version__) < (2, 0)`
`848`	`848`	`model_fields = list(`
`849`		`- first_element.__fields__ if old_pydantic else first_element.model_fields`
	`849`	`+ first_element.__fields__`
	`850`	`+ if old_pydantic`
	`851`	`+ else first_element.__class__.model_fields`
`850`	`852`	`)`
`851`	`853`	`(`
`852`	`854`	`unpack_nested,`