Fixed a bug with Whoosh's edge n-gram support to be consistent with the implementation in the other engines.

Author: toastdriven

haystack/backends/whoosh_backend.py

@@ -148,7 +148,7 @@ def build_schema(self, fields):
             elif field_class.field_type == 'ngram':
                 schema_fields[field_class.index_fieldname] = NGRAM(minsize=3, maxsize=15, stored=field_class.stored, field_boost=field_class.boost)
             elif field_class.field_type == 'edge_ngram':
-                schema_fields[field_class.index_fieldname] = NGRAMWORDS(minsize=2, maxsize=15, stored=field_class.stored, field_boost=field_class.boost)
+                schema_fields[field_class.index_fieldname] = NGRAMWORDS(minsize=2, maxsize=15, at='start', stored=field_class.stored, field_boost=field_class.boost)
             else:
                 schema_fields[field_class.index_fieldname] = TEXT(stored=True, analyzer=StemmingAnalyzer(), field_boost=field_class.boost)