Merge branch 'main' into patch-1

src/mudata/_core/merge.py

@@ -8,7 +8,7 @@
 from anndata import concat as ad_concat
 from anndata._core.merge import (
     StrategiesLiteral,
-    _resolve_dim,
+    _resolve_axis,
     check_combinable_cols,
     concat_pairwise_mapping,
     dim_indices,
@@ -168,8 +168,8 @@ def concat(
         )
 
     # Then concatenate multimodal annotations
-    axis, dim = _resolve_dim(axis=axis)
-    alt_axis, alt_dim = _resolve_dim(axis=1 - axis)
+    axis, dim = _resolve_axis(axis=axis)
+    alt_axis, alt_dim = _resolve_axis(axis=1 - axis)
 
     # Label column
     label_col = pd.Categorical.from_codes(

src/mudata/_core/mudata.py

@@ -1342,21 +1342,30 @@ def _shrink_attr(self, attr: str, inplace=True) -> pd.DataFrame:
     @property
     def n_mod(self) -> int:
         """
-        Number of modalities in the MuData object
+        Number of modalities in the MuData object.
+
+        Returns:
+            int: The number of modalities.
         """
         return len(self.mod)
 
     @property
     def isbacked(self) -> bool:
         """
-        Whether the MuData object is backed
+        Whether the MuData object is backed.
+
+        Returns:
+            bool: True if the object is backed, False otherwise.
         """
-        return self.filename is not None
+        return self.file.filename is not None
 
     @property
     def filename(self) -> Path | None:
         """
-        Filename of the MuData object
+        Filename of the MuData object.
+
+        Returns:
+            Path | None: The path to the file if backed, None otherwise.
         """
         return self.file.filename