Fixed app lookup search for multi-word queries (bug 767571)

Fuzzy searches use Levenshtein distance and don't tokenize the input. So
in the case of this bug, searching for "mozilla marketplace" tried to
compare the edit distance of "mozilla marketplace" to "mozilla" (and
"marketplace" separately). But the edit distance of both of these was
more than the default minimum of smallest word in the query string
("mozilla" = 7 words). So it assumed these were too far apart.

This patch adds a text query so either should match for a result.

mkt/lookup/tests/test_views.py

@@ -246,6 +246,13 @@ def test_by_name_part(self):
         data = self.search('steamcube')
         self.verify_result(data)
 
+    def test_multiword(self):
+        self.app.name = 'Mozilla Marketplace'
+        self.app.save()
+        self.refresh()
+        data = self.search('mozilla marketplace')
+        self.verify_result(data)
+
     def test_by_stem_name(self):
         self.app.name = 'Instigation'
         self.app.save()

mkt/lookup/views.py

@@ -196,7 +196,9 @@ def app_search(request):
         qs = Addon.objects.filter(guid=query).values(*non_es_fields)
         if not qs.count():
             # Give up on GUID, assume it's a search.
-            qs = Addon.search().query(name__fuzzy=query).values_dict(*fields)
+            qs = (Addon.search().query(or_=dict(name__text=query,
+                                                name__fuzzy=query))
+                                .values_dict(*fields))
     for app in qs:
         app['url'] = reverse('lookup.app_summary', args=[app['id']])
         # ES returns a list of localized names but database queries do not.