Here is the paste. http://pastebin.com/MzLNWUw2
1) rational for using synonym_for: the sqlajqgrid of toscawidgets2 (http://tw2-demos.threebean.org/module?module=tw2.jqplugins.jqgrid) uses sqlalchemy.orm.class_mapper(cls.entity).iterate_properties which does not show defined attributs/memoized_property column (like total_sales in code). But when I use synonym_for it displays that column. 2) It uses default sorters/comparators of sqlalchemy but those does not work on total_sales field producing the same traceback just as you get when running this example. It seems like it searches for some comparator sort of things for total_sales but I am not able to get the hang of it. On Sunday, 26 August 2012 07:32:59 UTC+5:30, Michael Bayer wrote: > > > On Aug 25, 2012, at 4:48 PM, jeetu wrote: > > > I have a sqlalchemy table defined like follows > > > > class Album(DeclarativeBase): > > > > # Name of mapped db table > > __tablename__ = 'material' > > id = Column(Integer, primary_key=True) > > name = Column(Unicode(50), nullable=False, unique=True) > > > > @synonym_for("_voltage") > > @memoized_property > > def total_sales(self): > > do some calculation here > > return result > > > > For some reasons(showing it in sqlajqgrid of tw2) I am using > synonym_for. Now when I try to use the sorting/comparisons which inturn > calls for same functions of sqlalchemy. it does not work. It gives a long > traceback with statements like > > > > return getattr(self.comparator, attribute) > > File > "/home/jeetu/LEARN/turbogears/tg22_venv/local/lib/python2.7/site-packages/SQLAlchemy-0.7.8-py2.7-linux-x86_64.egg/sqlalchemy/util/langhelpers.py", > > line 485, in __get__ > > obj.__dict__[self.__name__] = result = self.fget(obj) > > File > "/home/jeetu/LEARN/turbogears/tg22_venv/local/lib/python2.7/site-packages/SQLAlchemy-0.7.8-py2.7-linux-x86_64.egg/sqlalchemy/orm/attributes.py", > > line 203, in comparator > > self._comparator = self._comparator() > > File > "/home/jeetu/LEARN/turbogears/tg22_venv/local/lib/python2.7/site-packages/SQLAlchemy-0.7.8-py2.7-linux-x86_64.egg/sqlalchemy/orm/descriptor_props.py", > > line 67, in <lambda> > > lambda: self._comparator_factory(mapper), > > File > "/home/jeetu/LEARN/turbogears/tg22_venv/local/lib/python2.7/site-packages/SQLAlchemy-0.7.8-py2.7-linux-x86_64.egg/sqlalchemy/orm/descriptor_props.py", > > line 376, in _comparator_factory > > prop = self._proxied_property > > RuntimeError: maximum recursion depth exceeded while calling a Python > object > > > > As to my understanding it is searching for comparator function but not > able to find one. I tried implementing some sort of PropComparator, > ColumnComparator etc, but not able to get it rigth. Can somebody help me to > get the sorting function implemented. > > > I'd need a full example that reproduces this (which means, a single .py > file I can copy locally, and run it. ). the above snippet doesn't include > any detail, such as what "_voltage" is, what the comparator looks like, > etc. > > > -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/5IO5C_zCQ2QJ. To post to this group, send email to sqlalchemy@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.
