diff options
Diffstat (limited to 'lib/sqlalchemy/sql/expression.py')
| -rw-r--r-- | lib/sqlalchemy/sql/expression.py | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/sqlalchemy/sql/expression.py b/lib/sqlalchemy/sql/expression.py index ede3235c5..3cfe0a14c 100644 --- a/lib/sqlalchemy/sql/expression.py +++ b/lib/sqlalchemy/sql/expression.py @@ -1056,8 +1056,10 @@ def _column_as_key(element): def _literal_as_text(element): if hasattr(element, '__clause_element__'): return element.__clause_element__() - elif not isinstance(element, Visitable): + elif isinstance(element, basestring): return _TextClause(unicode(element)) + elif not isinstance(element, Visitable): + raise exc.ArgumentError("SQL expression object or string expected.") else: return element |