Allow None in keys for partial dimension overlap

holoviews/core/ndmapping.py

@@ -171,7 +171,7 @@ def _add_item(self, dim_vals, data, sort=True, update=True):
             if not self._instantiated and self.get_dimension(dim).values == 'initial':
                 if val not in vals:
                     self._cached_index_values[dim.name].append(val)
-            elif vals and val not in vals:
+            elif vals and val is not None and val not in vals:
                 raise KeyError('%s dimension value %s not in'
                                ' specified dimension values.' % (dim, repr(val)))
 

holoviews/core/util.py

@@ -548,6 +548,7 @@ def dimension_sort(odict, kdims, vdims, categorical, key_index, cached_values):
     indexes = [(dimensions[i], int(i not in range(ndims)),
                     i if i in range(ndims) else i-ndims)
                 for i in key_index]
+    cached_values = {d: [None]+vals for d, vals in cached_values.items()}
 
     if len(set(key_index)) != len(key_index):
         raise ValueError("Cannot sort on duplicated dimensions")

tests/testplotinstantiation.py

@@ -39,3 +39,13 @@ def test_dynamic_nonoverlap(self):
         dmap2 = DynamicMap(lambda x: Curve(np.random.rand(10,2))*VLine(x),
                            kdims=kdims[:1])
         renderer.get_widget(dmap1 + dmap2, 'selection')
+
+
+    def test_dynamic_values_partial_overlap(self):
+        kdims = [Dimension('File', range=(0.01, 1)),
+                 Dimension('SliceDimension', values=['x', 'y', 'z']),
+                 Dimension('Coordinates', range=(0.01, 1))]
+        dmap1 = DynamicMap(lambda x, y, z: Image(np.random.rand(10,10)), kdims=kdims)
+        dmap2 = DynamicMap(lambda x: Curve(np.random.rand(10,2))*VLine(x),
+                           kdims=kdims[:1])
+        renderer.get_widget(dmap1 + dmap2, 'selection')