Match the model attribute when checking a relation was prefetched (v0.19.4).

The prefetch check added in v0.19.3 reads the field name from the resolve
info, which on the batching path knows only the GraphQL name. That is
camelCase while the model attribute is not, so a prefetched relation whose
name has more than one word was still reported as falling back to one query
per parent.

Seen on a real schema: productModelDefinitions.productFieldDefinitions ran no
query of its own and was reported anyway.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: jamietdavidson

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "strawberry-orm"
-version = "0.19.3"
+version = "0.19.4"
 description = "Unified, backend-agnostic ORM abstraction for Strawberry GraphQL"
 readme = "README.md"
 license = "MIT"

src/strawberry_orm/batching.py

@@ -17,6 +17,7 @@
 
 from __future__ import annotations
 
+import re
 from inspect import isawaitable
 from typing import TYPE_CHECKING, Any
 
@@ -90,6 +91,11 @@ def stash_parents(execution_context: Any, info: Any, rows: Any) -> None:
     store[path_key(info)] = rows
 
 
+def _to_snake(name: str) -> str:
+    """GraphQL camelCase to the model's attribute spelling."""
+    return re.sub(r"(?<=[a-z0-9])([A-Z])", r"_\1", name).lower()
+
+
 def _already_loaded(root: Any, info: Any) -> bool:
     """True when this field's rows were loaded with the parent.
 
@@ -103,8 +109,12 @@ def _already_loaded(root: Any, info: Any) -> bool:
         _tortoise_relation_prefetched,
     )
 
-    name = getattr(info, "python_name", None) or _path_field_names(info)[-1:]
-    field_name = name if isinstance(name, str) else (name[0] if name else None)
+    field_name = getattr(info, "python_name", None)
+    if field_name is None:
+        # A raw resolve info knows only the GraphQL name, which is camelCase
+        # while the model attribute is not.
+        path = _path_field_names(info)
+        field_name = _to_snake(path[-1]) if path else None
     if field_name is None:
         return False
     for probe in (