示例#1
0
    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_))
示例#2
0
    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_))