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fix: check self._grid instead of self._ds in data_vars property #121

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fix: check self._grid instead of self._ds in data_vars property #121

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cbd759c
fix: guard data_vars when no grid is recognized
nishantharkut Mar 17, 2026
bbfb6ab
fix: address review feedback on accessor type annotations
nishantharkut Mar 17, 2026
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17 changes: 17 additions & 0 deletions tests/test_accessor.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,17 @@
import pytest
import xarray as xr

import xarray_subset_grid.accessor # noqa: F401


def test_data_vars_returns_empty_set_when_grid_not_recognized():
ds = xr.Dataset(
data_vars={"foo": ("x", [1, 2, 3])},
coords={"x": [0, 1, 2]},
)

with pytest.warns(UserWarning, match="no grid type found in this dataset"):
accessor = ds.xsg

assert accessor.grid is None
assert accessor.data_vars == set()
12 changes: 7 additions & 5 deletions xarray_subset_grid/accessor.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
import warnings
from typing import TYPE_CHECKING

# from typing import Optional, Union
import numpy as np
Expand All @@ -15,6 +16,9 @@
UGrid,
)

if TYPE_CHECKING:
from xarray.core.coordinates import DatasetCoordinates

_grid_impls = [
FVCOMGrid,
SELFEGrid,
Expand Down Expand Up @@ -78,15 +82,13 @@ def data_vars(self) -> set[str]:
data analysis. These can be discarded when subsetting the
dataset when they are not needed.
"""
if self._ds:
if self._grid:
return self._grid.data_vars(self._ds)
return set()

@property
def coords(self) -> set[str]:
if self._ds:
return self._ds.coords
return set()
def coords(self) -> "DatasetCoordinates":
return self._ds.coords

@property
def grid_vars(self) -> set[str]:
Expand Down