Fix the bug.

Author: tsalo

src/modelarrayio/storage/tiledb_storage.py

@@ -176,6 +176,8 @@ def create_scalar_matrix_array(
         storage_np_dtype,
         tile_shape,
     )
+    if tiledb.object_type(uri):
+        tiledb.remove(uri)
     tiledb.Array.create(uri, schema)
 
     logger.info('Writing full array %s to TileDB (this may take a while)...', uri)
@@ -265,6 +267,8 @@ def create_empty_scalar_matrix_array(
         storage_np_dtype,
         tile_shape,
     )
+    if tiledb.object_type(uri):
+        tiledb.remove(uri)
     tiledb.Array.create(uri, schema)
 
     if sources_list is not None:

test/test_voxels_cli.py

@@ -351,7 +351,6 @@ def test_nifti_tiledb_fails_when_output_already_exists(tmp_path, monkeypatch):
     assert out_tdb.exists()
     assert tiledb.object_type(str(out_tdb / 'scalars' / 'FA' / 'values')) is not None
 
-    # Second run to the same output directory should fail because the TileDB
-    # arrays already exist (this is the bug reported in issue #39).
-    with pytest.raises(tiledb.TileDBError, match='already exists'):
-        modelarrayio_main(cli_args)
+    # Second run to the same output directory should succeed now that existing
+    # arrays are removed before re-creation (regression for issue #39).
+    assert modelarrayio_main(cli_args) == 0