check axes equality in structured grids instead of points, check for arg type in has_time_axis

src/finam/data/grid_tools.py

@@ -585,7 +585,6 @@ class Grid(GridBase):
         if isinstance(self, StructuredGrid) != isinstance(other, StructuredGrid):
             return False
 
-        # Might comparison of data_points be sufficient here?
         return (
             self.dim == other.dim
             and self.crs == other.crs
@@ -765,6 +764,22 @@ class StructuredGrid(Grid):
             np.maximum(dims - 1, 1) if self.data_location == Location.CELLS else dims
         )
 
+    def __eq__(self, other):
+        if not isinstance(other, Grid):
+            return False
+
+        if not isinstance(other, StructuredGrid):
+            return False
+
+        return (
+            self.dim == other.dim
+            and self.crs == other.crs
+            and self.order == other.order
+            and self.data_location == other.data_location
+            and self.data_shape == other.data_shape
+            and all(np.allclose(a, b) for a, b in zip(self.axes, other.axes))
+        )
+
     def export_vtk(
         self,
         path,

src/finam/data/tools.py

@@ -146,7 +146,17 @@ def has_time_axis(xdata, grid):
     bool
         Whether the data has a time axis.
     """
-    grid_dim = len(grid.data_shape) if isinstance(grid, Grid) else grid.dim
+    grid_dim = None
+
+    if isinstance(grid, Grid):
+        grid_dim = len(grid.data_shape)
+    elif isinstance(grid, grid_spec.NoGrid):
+        grid_dim = grid.dim
+    else:
+        raise ValueError(
+            f"Expected type Grid or NoGrid, got {grid.__class__.__name__}."
+        )
+
     if xdata.ndim == grid_dim:
         return False