Altered the simple backend to only search textual fields. This makes the backend work consistently across all databases and is likely the desired behavior anyhow. Thanks to kylemacfarlane for the report.

Author: toastdriven

haystack/backends/simple_backend.py

@@ -57,10 +57,19 @@ def search(self, query_string, sort_by=None, start_offset=0, end_offset=None,
                     qs = model.objects.all()
                 else:
                     for term in query_string.split():
-                        queries = [
-                            Q(**{'%s__icontains' % field.name: term}) for field in model._meta._fields() if not hasattr(field, 'related')
-                        ]
+                        queries = []
+                        
+                        for field in model._meta._fields():
+                            if hasattr(field, 'related'):
+                                continue
+                            
+                            if not field.get_internal_type() in ('TextField', 'CharField', 'SlugField'):
+                                continue
+                            
+                            queries.append(Q(**{'%s__icontains' % field.name: term}))
+                        
                         qs = model.objects.filter(reduce(lambda x, y: x|y, queries))
+                
                 hits += len(qs)
                 results.extend([match for match in qs])
 

tests/simple_tests/tests/simple_backend.py

@@ -14,17 +14,17 @@ class SimpleMockSearchIndex(indexes.SearchIndex):
 
 class SimpleSearchBackendTestCase(TestCase):
     fixtures = ['bulk_data.json']
-
+    
     def setUp(self):
         super(SimpleSearchBackendTestCase, self).setUp()
-
+        
         self.site = SearchSite()
         self.backend = SearchBackend(site=self.site)
         self.index = SimpleMockSearchIndex(MockModel, backend=self.backend)
         self.site.register(MockModel, SimpleMockSearchIndex)
-
+        
         self.sample_objs = MockModel.objects.all()
-
+    
     def test_update(self):
         self.backend.update(self.index, self.sample_objs)
 
@@ -37,23 +37,23 @@ def test_clear(self):
     def test_search(self):
         # No query string should always yield zero results.
         self.assertEqual(self.backend.search(u''), {'hits': 0, 'results': []})
-    
+        
         self.assertEqual(self.backend.search(u'*')['hits'], 23)
         self.assertEqual([result.pk for result in self.backend.search(u'*')['results']], [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23])
-
+        
         self.assertEqual(self.backend.search(u'daniel')['hits'], 23)
         self.assertEqual([result.pk for result in self.backend.search(u'daniel')['results']], [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23])
-    
+        
         self.assertEqual(self.backend.search(u'should be a string')['hits'], 1)
         self.assertEqual([result.pk for result in self.backend.search(u'should be a string')['results']], [8])
-    
+        
         self.assertEqual(self.backend.search(u'index document')['hits'], 6)
         self.assertEqual([result.pk for result in self.backend.search(u'index document')['results']], [2, 3, 15, 16, 17, 18])
-    
+        
         # No support for spelling suggestions
         self.assertEqual(self.backend.search(u'Indx')['hits'], 0)
         self.assertFalse(self.backend.search(u'Indx').get('spelling_suggestion'))
-    
+        
         # No support for facets
         self.assertEqual(self.backend.search(u'', facets=['name']), {'hits': 0, 'results': []})
         self.assertEqual(self.backend.search(u'daniel', facets=['name'])['hits'], 23)
@@ -64,6 +64,9 @@ def test_search(self):
         self.assertFalse(self.backend.search(u'').get('facets'))
         self.assertFalse(self.backend.search(u'daniel').get('facets'))
 
+        # Note that only textual-fields are supported.
+        self.assertEqual(self.backend.search(u'2009-06-18')['hits'], 0)
+        
     def test_more_like_this(self):
         self.backend.update(self.index, self.sample_objs)
         self.assertEqual(self.backend.search(u'*')['hits'], 23)