def _key_fallback(self, key, raiseerr=True):
map = self._keymap
result = None
if isinstance(key, str):
result = map.get(key)
# fallback for targeting a ColumnElement to a textual expression
# this is a rare use case which only occurs when matching text()
# or colummn('name') constructs to ColumnElements, or after a
# pickle/unpickle roundtrip
elif isinstance(key, expression.ColumnElement):
if (key._label and key._label in map):
result = map[key._label]
elif (hasattr(key, 'name') and key.name in map):
# match is only on name.
result = map[key.name]
# search extra hard to make sure this
# isn't a column/label name overlap.
# this check isn't currently available if the row
# was unpickled.
if (result is not None and result[1] is not None):
for obj in result[1]:
if key._compare_name_for_result(obj):
break
else:
result = None
if result is None:
if raiseerr:
raise exc.NoSuchColumnError(
"Could not locate column in row for column '%s'" %
expression._string_or_unprintable(key))
else:
return None
else:
map[key] = result
return result
def _key_fallback(self, key, raiseerr=True):
map = self._keymap
result = None
if isinstance(key, str):
result = map.get(key)
# fallback for targeting a ColumnElement to a textual expression
# this is a rare use case which only occurs when matching text()
# or colummn('name') constructs to ColumnElements, or after a
# pickle/unpickle roundtrip
elif isinstance(key, expression.ColumnElement):
if (key._label and key._label in map):
result = map[key._label]
elif (hasattr(key, 'name') and key.name in map):
# match is only on name.
result = map[key.name]
# search extra hard to make sure this
# isn't a column/label name overlap.
# this check isn't currently available if the row
# was unpickled.
if (result is not None and
result[1] is not None):
for obj in result[1]:
if key._compare_name_for_result(obj):
break
else:
result = None
if result is None:
if raiseerr:
raise exc.NoSuchColumnError(
"Could not locate column in row for column '%s'" %
expression._string_or_unprintable(key))
else:
return None
else:
map[key] = result
return result