visualization: handle no dimension in json_data() (#39362)

bijoe/visualization/utils.py

@@ -305,6 +305,12 @@ class Visualization(object):
         elif len(self.drilldown) == 1:
             axis, grid = self.table_1d()
             cells = ((['%s' % x.label], cell_value(grid[x.id])) for x in axis)
+        elif len(self.drilldown) == 0:
+            for row in self.data():
+                cells = [([], cell_value(row.measures[0]))]
+                break
+            else:
+                cells = [([], self.measure.default_value)]
         else:
             raise NotImplementedError
 

tests/test_schema1.py

@@ -207,7 +207,18 @@ def test_truncated_previous_year_range_on_datetime(schema1, app, admin, freezer)
     ]
 
 
-def test_none_percent_json_data(schema1, app, admin):
+def test_none_percent_json_data_0d(schema1, app, admin):
+    # test conversion to Javascript declaration
+    visu = Visualization.from_json({
+        'warehouse': 'schema1',
+        'cube': 'facts1',
+        'representation': 'graphical',
+        'measure': 'percent',
+    })
+    assert visu.json_data() == [{u'coords': [], u'measures': [{u'value': 100.0}]}]
+
+
+def test_none_percent_json_data_2d(schema1, app, admin):
     # test conversion to Javascript declaration
     visu = Visualization.from_json({
         'warehouse': 'schema1',