def contains_alias(alias):
"""Return a ``MapperOption`` that will indicate to the query that
the main table has been aliased.
`alias` is the string name or ``Alias`` object representing the
alias.
"""
class AliasedRow(MapperExtension):
def __init__(self, alias):
self.alias = alias
if isinstance(self.alias, basestring):
self.selectable = None
else:
self.selectable = alias
self._row_translators = {}
def get_selectable(self, mapper):
if self.selectable is None:
self.selectable = mapper.mapped_table.alias(self.alias)
return self.selectable
def translate_row(self, mapper, context, row):
if mapper in self._row_translators:
return self._row_translators[mapper](row)
else:
translator = create_row_adapter(self.get_selectable(mapper), mapper.mapped_table)
self._row_translators[mapper] = translator
return translator(row)
return ExtensionOption(AliasedRow(alias))
def contains_alias(alias):
"""Return a ``MapperOption`` that will indicate to the query that
the main table has been aliased.
`alias` is the string name or ``Alias`` object representing the
alias.
"""
class AliasedRow(MapperExtension):
def __init__(self, alias):
self.alias = alias
if isinstance(self.alias, basestring):
self.selectable = None
else:
self.selectable = alias
def get_selectable(self, mapper):
if self.selectable is None:
self.selectable = mapper.mapped_table.alias(self.alias)
return self.selectable
def translate_row(self, mapper, context, row):
newrow = sautil.DictDecorator(row)
selectable = self.get_selectable(mapper)
for c in mapper.mapped_table.c:
c2 = selectable.corresponding_column(c,
keys_ok=True,
raiseerr=False)
if c2 and c2 in row:
newrow[c] = row[c2]
return newrow
return ExtensionOption(AliasedRow(alias))
def extension(ext):
"""Return a ``MapperOption`` that will insert the given
``MapperExtension`` to the beginning of the list of extensions
that will be called in the context of the ``Query``.
Used with ``query.options()``.
"""
return ExtensionOption(ext)
def contains_alias(alias):
"""Return a ``MapperOption`` that will indicate to the query that
the main table has been aliased.
`alias` is the string name or ``Alias`` object representing the
alias.
"""
class AliasedRow(MapperExtension):
def __init__(self, alias):
self.alias = alias
if isinstance(self.alias, basestring):
self.translator = None
else:
self.translator = create_row_adapter(alias)
def translate_row(self, mapper, context, row):
if not self.translator:
self.translator = create_row_adapter(
mapper.mapped_table.alias(self.alias))
return self.translator(row)
return ExtensionOption(AliasedRow(alias))
