Improved GridColumns validation

holoviz · Mar 9, 2016 · a5d134b · a5d134b
1 parent 49e729a
commit a5d134b
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/holoviews/core/data.py b/holoviews/core/data.py
@@ -1352,6 +1352,18 @@ def reshape(cls, eltype, data, kdims, vdims):
         if vdims is None:
             vdims = eltype.vdims
 
+        if not vdims:
+            raise ValueError('GridColumns interface requires at least '
+                             'one value dimension.')
+
+        dimensions = [d.name if isinstance(d, Dimension) else
+                      d for d in kdims + vdims]
+        if isinstance(data, tuple):
+            data = {d: v for d, v in zip(dimensions, data)}
+        else):
+            raise ValueError('GridColumns must be instantiated as a '
+                             'dictionary or tuple')
+
         if 'vdims' in data:
             vdim_array = data.pop('vdims')
             for i, vdim in enumerate(vdims):