Fix a bug accessing matrix's dimnames (#55)

Update tests

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## Version 0.6.1
+
+- Fix name of the attribute that contains names of dimensions in matrices.
+- Update relevant tests and generate new rds files to test matrix behavior.
+
 ## Version 0.6.0
 
 - chore: Remove Python 3.8 (EOL).

src/rds2py/read_matrix.py

@@ -93,10 +93,13 @@ def _as_sparse_matrix(robject: dict, **kwargs) -> spmatrix:
         )
 
     names = None
-    if "dimnames" in robject["attributes"]:
-        names = _dispatcher(robject["attributes"]["dimnames"], **kwargs)
+    if "Dimnames" in robject["attributes"]:
+        names = _dispatcher(robject["attributes"]["Dimnames"], **kwargs)
         if names is not None and len(names) > 0:
-            return MatrixWrapper(mat, names)
+            # Use the wrapper class onyly if names are available
+            # for atleast one dimension
+            if not all(x is None for x in names):
+                return MatrixWrapper(mat, names)
 
     return mat
 

tests/data/generate_files.R

@@ -97,6 +97,12 @@ saveRDS(df, file="lists_df_rownames.rds")
 y <- Matrix::rsparsematrix(100, 10, 0.05)
 saveRDS(y, file="s4_matrix.rds")
 
+rownames(y) <- paste("row", 1:nrow(y), sep="_")
+saveRDS(y, file="matrix_with_row_names.rds")
+
+colnames(y) <- paste("col", 1:ncol(y), sep="_")
+saveRDS(y, file="matrix_with_dim_names.rds")
+
 setClass("FOO", slots=c(bar="integer"))
 y <- new("FOO", bar=2L)
 saveRDS(y, file="s4_class.rds")

tests/test_matrices.py

@@ -17,6 +17,22 @@ def test_read_s4_matrix_dgc():
     assert array is not None
     assert isinstance(array, sp.spmatrix)
 
+def test_read_s4_matrix_dgc_with_rownames():
+    array = read_rds("tests/data/matrix_with_row_names.rds")
+
+    assert array is not None
+    assert isinstance(array, MatrixWrapper)
+    assert len(array.dimnames[0]) == 100
+    assert array.dimnames[1] is None
+
+
+def test_read_s4_matrix_dgc_with_bothnames():
+    array = read_rds("tests/data/matrix_with_dim_names.rds")
+
+    assert array is not None
+    assert isinstance(array, MatrixWrapper)
+    assert len(array.dimnames[0]) == 100
+    assert len(array.dimnames[1]) == 10
 
 def test_read_s4_matrix_dgt():
     array = read_rds("tests/data/s4_matrix_dgt.rds")