autoreport ignores non-numeric values in numeric field

src/formpack/pack.py

@@ -233,7 +233,6 @@ def get_fields_for_versions(self, versions=-1, data_types=None):
             if isinstance(data_types, str_types):
                 data_types = [data_types]
 
-
         # tmp2 is a 2 dimensions list of `field`.
         # First dimension is the position of fields where they should be in the latest version
         # Second dimension is their position in the stack at the same position.

src/formpack/reporting/autoreport.py

@@ -2,6 +2,7 @@
 
 from __future__ import (division, print_function, unicode_literals)
 
+import logging
 from collections import Counter, defaultdict
 
 from ..constants import UNSPECIFIED_TRANSLATION
@@ -70,9 +71,18 @@ def _calculate_stats(self, submissions, fields, versions, lang):
                     counter = metrics[field.name]
                     raw_value = entry.get(field.path)
                     if raw_value is not None:
-                        values = list(field.parse_values(raw_value))
-                        counter.update(values)
-                        counter['__submissions__'] += 1
+                        try:
+                            values = list(field.parse_values(raw_value))
+                        except ValueError as e:
+                            # TODO: Remove try/except when
+                            # https://github.com/kobotoolbox/formpack/issues/151
+                            # is fixed?
+                            logging.warning(str(e), exc_info=True)
+                            # Treat the bad value as a blank response
+                            counter[None] += 1
+                        else:
+                            counter.update(values)
+                            counter['__submissions__'] += 1
                     else:
                         counter[None] += 1
 

tests/test_autoreport.py

@@ -381,3 +381,51 @@ def test_disaggregate_extended_fields(self):
                 frequency_responses = [x[0] for x in value_list.get("frequency")]
                 assert percentage_responses == frequency_responses
                 assert percentage_responses[-1] == "..."
+
+    def test_stats_with_non_numeric_value_for_numeric_field(self):
+        '''
+        A string response to an integer question, for example, should not cause
+        a crash; it should be treated as if no response was provided
+        '''
+
+        title = 'Just one number'
+        schemas = [{
+            'content': {
+                'survey': [
+                    {
+                        'type': 'integer',
+                        'name': 'the_number',
+                        'label': 'Enter the number!'
+                    }
+                ]
+            }
+        }]
+        submissions = [
+            {'the_number': 10},
+            {'the_number': 20},
+            {'the_number': 30},
+            {'the_number': 'oops!'},
+        ]
+        fp = FormPack(schemas, title)
+
+        report = fp.autoreport()
+        stats = report.get_stats(submissions)
+
+        assert stats.submissions_count == len(submissions)
+
+        stats = [(unicode(repr(f)), n, d) for f, n, d in stats]
+        expected = [(
+            "<NumField name='the_number' type='integer'>", 'the_number',
+            {
+                'mean': 20.0,
+                'median': 20,
+                'mode': u'*',
+                'not_provided': 1,
+                'provided': 3,
+                'show_graph': False,
+                'stdev': 10.0,
+                'total_count': 4
+            }
+        )]
+        for (i, stat) in enumerate(stats):
+            assert stat == expected[i]