def _process_dependent_arguments(self):
# accept callables for other attributes which may require deferred initialization
for attr in ('order_by', 'primaryjoin', 'secondaryjoin', 'secondary', '_foreign_keys', 'remote_side'):
if util.callable(getattr(self, attr)):
setattr(self, attr, getattr(self, attr)())
# in the case that InstrumentedAttributes were used to construct
# primaryjoin or secondaryjoin, remove the "_orm_adapt" annotation so these
# interact with Query in the same way as the original Table-bound Column objects
for attr in ('primaryjoin', 'secondaryjoin'):
val = getattr(self, attr)
if val is not None:
util.assert_arg_type(val, sql.ClauseElement, attr)
setattr(self, attr, _orm_deannotate(val))
if self.order_by:
self.order_by = [expression._literal_as_column(x) for x in util.to_list(self.order_by)]
self._foreign_keys = util.column_set(expression._literal_as_column(x) for x in util.to_column_set(self._foreign_keys))
self.remote_side = util.column_set(expression._literal_as_column(x) for x in util.to_column_set(self.remote_side))
if not self.parent.concrete:
for inheriting in self.parent.iterate_to_root():
if inheriting is not self.parent and inheriting._get_property(self.key, raiseerr=False):
util.warn(
("Warning: relation '%s' on mapper '%s' supercedes "
"the same relation on inherited mapper '%s'; this "
"can cause dependency issues during flush") %
(self.key, self.parent, inheriting))
# TODO: remove 'self.table'
self.target = self.table = self.mapper.mapped_table
if self.cascade.delete_orphan:
if self.parent.class_ is self.mapper.class_:
raise sa_exc.ArgumentError("In relationship '%s', can't establish 'delete-orphan' cascade "
"rule on a self-referential relationship. "
"You probably want cascade='all', which includes delete cascading but not orphan detection." %(str(self)))
self.mapper.primary_mapper().delete_orphans.append((self.key, self.parent.class_))
def _determine_targets(self):
if isinstance(self.argument, type):
self.mapper = mapper.class_mapper(self.argument, compile=False)
elif isinstance(self.argument, mapper.Mapper):
self.mapper = self.argument
elif util.callable(self.argument):
# accept a callable to suit various deferred-configurational schemes
self.mapper = mapper.class_mapper(self.argument(), compile=False)
else:
raise sa_exc.ArgumentError(
"relation '%s' expects a class or a mapper argument (received: %s)" % (self.key, type(self.argument))
)
assert isinstance(self.mapper, mapper.Mapper), self.mapper
# accept callables for other attributes which may require deferred initialization
for attr in ("order_by", "primaryjoin", "secondaryjoin", "secondary", "_foreign_keys", "remote_side"):
if util.callable(getattr(self, attr)):
setattr(self, attr, getattr(self, attr)())
# in the case that InstrumentedAttributes were used to construct
# primaryjoin or secondaryjoin, remove the "_orm_adapt" annotation so these
# interact with Query in the same way as the original Table-bound Column objects
for attr in ("primaryjoin", "secondaryjoin"):
val = getattr(self, attr)
if val is not None:
util.assert_arg_type(val, sql.ClauseElement, attr)
setattr(self, attr, _orm_deannotate(val))
if self.order_by:
self.order_by = [expression._literal_as_column(x) for x in util.to_list(self.order_by)]
self._foreign_keys = util.column_set(
expression._literal_as_column(x) for x in util.to_column_set(self._foreign_keys)
)
self.remote_side = util.column_set(
expression._literal_as_column(x) for x in util.to_column_set(self.remote_side)
)
if not self.parent.concrete:
for inheriting in self.parent.iterate_to_root():
if inheriting is not self.parent and inheriting._get_property(self.key, raiseerr=False):
util.warn(
(
"Warning: relation '%s' on mapper '%s' supercedes "
"the same relation on inherited mapper '%s'; this "
"can cause dependency issues during flush"
)
% (self.key, self.parent, inheriting)
)
# TODO: remove 'self.table'
self.target = self.table = self.mapper.mapped_table
if self.cascade.delete_orphan:
if self.parent.class_ is self.mapper.class_:
raise sa_exc.ArgumentError(
"In relationship '%s', can't establish 'delete-orphan' cascade "
"rule on a self-referential relationship. "
"You probably want cascade='all', which includes delete cascading but not orphan detection."
% (str(self))
)
self.mapper.primary_mapper().delete_orphans.append((self.key, self.parent.class_))