[Sqlalchemy-tickets] Issue #4129: mapper_configured event 100% non functional, no tests, need to remove from docs ASAP until fixed (zzzeek/sqlalchemy)

[Michael B. <iss...@bi...>]

New issue 4129: mapper_configured event 100% non functional, no tests, need to remove from docs ASAP until fixed
https://bitbucket.org/zzzeek/sqlalchemy/issues/4129/mapper_configured-event-100-non-functional

Michael Bayer:

```
#!python

from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import event
from sqlalchemy.orm import mapper

# TypeError: 'memoized_property' object is not iterable
# @event.listens_for(mapper, "mapper_configured", propagate=True)
# def evt1(*arg, **kw):
#    print "Evt1"

Base = declarative_base()


# nothing
@event.listens_for(Base, "mapper_configured", propagate=True)
def evt2(*arg, **kw):
    print "Evt2"


class SomeMixin(object):
    pass


# nothing
@event.listens_for(SomeMixin, "mapper_configured", propagate=True)
def evt3(*arg, **kw):
    print "Evt3"


class A(SomeMixin, Base):
    __tablename__ = 'a'
    id = Column(Integer, primary_key=True)
    bs = relationship("B")


e = create_engine("sqlite://", echo=True)
Base.metadata.create_all(e)



```