Only catch validation errors

src/ome_zarr_models/__init__.py

@@ -1,6 +1,7 @@
 from importlib.metadata import PackageNotFoundError, version
 
 import zarr
+from pydantic import ValidationError
 
 import ome_zarr_models.v04.hcs
 import ome_zarr_models.v04.image
@@ -37,7 +38,7 @@ def load_ome_zarr_group(group: zarr.Group) -> BaseGroup:
     for group_cls in _V04_groups:
         try:
             return group_cls.from_zarr(group)
-        except Exception:
+        except ValidationError:
             continue
 
     raise RuntimeError(f"Could not find any matches for group {group}")

src/ome_zarr_models/v04/image.py

@@ -6,7 +6,6 @@
 from pydantic import Field, model_validator
 from pydantic_zarr.v2 import ArraySpec, GroupSpec
 
-from ome_zarr_models._utils import get_store_path
 from ome_zarr_models.base import BaseAttrs
 from ome_zarr_models.v04.base import BaseGroupv04
 from ome_zarr_models.v04.labels import Labels
@@ -95,18 +94,7 @@ def from_zarr(cls, group: zarr.Group) -> Self:
         # on unlistable storage backends, the members of this group will be {}
         guess = GroupSpec.from_zarr(group, depth=0)
 
-        try:
-            multi_meta_maybe = guess.attributes["multiscales"]
-        except KeyError as e:
-            store_path = get_store_path(group.store)
-            msg = (
-                "Failed to find mandatory `multiscales` key in the attributes of the "
-                "Zarr group at "
-                f"{group.store}://{store_path}://{group.path}."
-            )
-            raise KeyError(msg) from e
-
-        multi_meta = ImageAttrs(multiscales=multi_meta_maybe)
+        multi_meta = ImageAttrs.model_validate(guess.attributes)
         members_tree_flat = {}
         for multiscale in multi_meta.multiscales:
             for dataset in multiscale.datasets:

tests/v04/test_multiscales.py

@@ -492,13 +492,9 @@ def test_from_zarr_missing_metadata(
 ) -> None:
     group_model = GroupSpec()
     group = group_model.to_zarr(store, path="test")
-    store_path = ""
     # store_path = store.path if hasattr(store, "path") else ""
-    match = (
-        "Failed to find mandatory `multiscales` key in the attributes of the "
-        f"Zarr group at {store}://{store_path}://{group.path}."
-    )
-    with pytest.raises(KeyError, match=match):
+    match = "multiscales\n  Field required"
+    with pytest.raises(ValidationError, match=match):
         Image.from_zarr(group)