Ming MapperExtenstions用法

Question

from ming.odm.mapper import MapperExtension
class MyExtension(MapperExtension):
    def after_insert(self, obj, st):
        print "instance %s after insert !" % obj

class MyMappedClass(MappedClass):
    class __mongometa__:
        session = session
        name = 'my_mapped_class'
        extensions = [ MyExtension ]

    _id = FieldProperty(schema.ObjectId)
    data = FieldProperty(schema.String,if_missing='')

我尝试使用官方Ming文档中的MapperExtension。 以及我正在创建的文档：

t = model.MyMappedClass()
model._session.flush()

TypeError: before_insert() takes exactly 3 arguments (4 given)

Answer 1

事实证明，MapperExtension基类有一个错误，现在已在主分支和文档中修复。