bug fix

Author: yohai

xarray/plot/facetgrid.py

@@ -8,7 +8,7 @@
 from .utils import (
     _infer_xy_labels, _process_cmap_cbar_kwargs, import_matplotlib_pyplot,
     label_from_attrs)
-
+import xarray as xr
 # Overrides axes.labelsize, xtick.major.size, ytick.major.size
 # from mpl.rcParams
 _FONTSIZE = 'small'
@@ -337,9 +337,13 @@ def _finalize_grid(self, *axlabels):
             self._finalized = True
 
     def add_legend(self, **kwargs):
+        if isinstance(self._hue_var, xr.DataArray):
+            labels = self._hue_var.values
+        else:
+            labels = self._hue_var
         figlegend = self.fig.legend(
             handles=self._mappables[-1],
-            labels=list(self._hue_var.values),
+            labels=list(labels),
             title=self._hue_label,
             loc="center right", **kwargs)