On Feb 24, 2010, at 6:14 AM, flya flya wrote: > Yes, this is what I wonder, but my code use orm, declarative_base(), not > mapper, I write these code follow the document's example, it can't work too, > what's wrong with my code? > > Base = declarative_base() > class Page(Base): > __tablename__ = 'pages' > id = Column(Integer, primary_key=True) > parent_id = Column('parent_id', Integer, ForeignKey('pages.id')) > > children = relation('Page') > parent = relation('Page', remote_side=['pages.c.id'])
no quotes unless the [] are in there as well. See this FAQ entry: http://www.sqlalchemy.org/trac/wiki/FAQ#ImusingDeclarativeandsettingprimaryjoinsecondaryjoinusinganand_oror_andIamgettinganerrormessageaboutforeignkeys. > > when insert a data, raise the error information: > raise sa_exc.ArgumentError("Relation %s could not determine any local/remote > column pairs from remote side argument %r" % (self, self.remote_side)) > sqlalchemy.exc.ArgumentError: Relation Page.parent could not determine any > local/remote column pairs from remote side argument > set([<sqlalchemy.sql.expression.ColumnClause at 0xa17690c; pages.c.id>]) > > > On Wed, Feb 24, 2010 at 3:39 PM, Oliver Beattie <oli...@obeattie.com> wrote: > > You probably want to take a look at > > http://www.sqlalchemy.org/docs/05/mappers.html#adjacency-list-relationships > > > > On Feb 23, 5:42 pm, flya flya <flyafl...@gmail.com> wrote: > >> here is code: > >> > >> Base = declarative_base() > >> class Page(Base): > >> __tablename__ = 'pages' > >> id = Column(Integer, primary_key=True) > >> parent_id = Column('parent_id', Integer, ForeignKey('pages.id')) > >> > >> children = relation('Page', backref='parent') > >> > >> I get error information: > >> sqlalchemy.exc.ArgumentError: Page.children and back-reference > >> Page.parent are both of the same direction <symbol 'ONETOMANY>. Did > >> you mean to set remote_side on the many-to-one side ? > >> > >> when change the code > >> children = relation('Page', backref='parent') > >> to > >> childen = relation('Page') > >> It can work , but I can only get 'children' no 'parent' from a Page > >> instant. > > > > -- > > You received this message because you are subscribed to the Google Groups > > "sqlalchemy" group. > > To post to this group, send email to sqlalch...@googlegroups.com. > > To unsubscribe from this group, send email to > > sqlalchemy+unsubscr...@googlegroups.com. > > For more options, visit this group at > > http://groups.google.com/group/sqlalchemy?hl=en. > > > > > > > > -- > http://www.flyaflya.com > > > -- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To post to this group, send email to sqlalch...@googlegroups.com. > To unsubscribe from this group, send email to > sqlalchemy+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/sqlalchemy?hl=en. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.