diff options
Diffstat (limited to 'lib/sqlalchemy/sql/expression.py')
| -rw-r--r-- | lib/sqlalchemy/sql/expression.py | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/lib/sqlalchemy/sql/expression.py b/lib/sqlalchemy/sql/expression.py index ddeaaf8ad..55001dc70 100644 --- a/lib/sqlalchemy/sql/expression.py +++ b/lib/sqlalchemy/sql/expression.py @@ -1398,9 +1398,8 @@ class ColumnElement(ClauseElement, _CompareMixin): docstring for more details. """ - def __init__(self): - self.primary_key = False - self.foreign_keys = [] + primary_key = False + foreign_keys = [] def base_columns(self): if hasattr(self, '_base_columns'): @@ -1557,7 +1556,6 @@ class FromClause(Selectable): self.oid_column = None def _get_from_objects(self, **modifiers): - # this could also be [self], at the moment it doesnt matter to the Select object return [] def default_order_by(self): @@ -2486,7 +2484,6 @@ class _ColumnElementAdapter(ColumnElement): """ def __init__(self, elem): - ColumnElement.__init__(self) self.elem = elem self.type = getattr(elem, 'type', None) @@ -2900,8 +2897,11 @@ class _ScalarSelect(_Grouping): __visit_name__ = 'grouping' def __init__(self, elem): - super(_ScalarSelect, self).__init__(elem) - self.type = list(elem.inner_columns)[0].type + self.elem = elem + cols = list(elem.inner_columns) + if len(cols) != 1: + raise exceptions.InvalidRequestError("Scalar select can only be created from a Select object that has exactly one column expression.") + self.type = cols[0].type def _no_cols(self): raise exceptions.InvalidRequestError("Scalar Select expression has no columns; use this object directly within a column-level expression.") @@ -3086,6 +3086,10 @@ class Select(_SelectBaseMixin, FromClause): froms = property(_get_display_froms, doc="""Return a list of all FromClause elements which will be applied to the FROM clause of the resulting statement.""") + def type(self): + raise exceptions.InvalidRequestError("Select objects don't have a type. Call as_scalar() on this Select object to return a 'scalar' version of this Select.") + type = property(type) + def locate_all_froms(self): """return a Set of all FromClause elements referenced by this Select. |