make the bbox param more self-documenting

gazetteer/places/models.py

@@ -22,7 +22,7 @@ class FeatureSearchManager(models.GeoManager):
         if text:
             text = text.replace("'", "''") # escape the '
             # use the pg_trgm index
-            qset = qset.extra(where=["preferred_name %% '%s'" % text])
+            qset = qset.extra(where="[preferred_name %% '%s']" % text)
         return qset
 
 class Feature(models.Model):
@@ -37,7 +37,7 @@ class Feature(models.Model):
     time_frame = models.ForeignKey("TimeFrame", null=True, blank=True)
     relationships = models.ManyToManyField("Feature", through='Relationship', blank=True)
     objects = models.GeoManager()
-    search = models.FeatureSearchManager()
+    search = FeatureSearchManager()
 
     class Meta:
         ordering = ['preferred_name']