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='')

我嘗試使用官方Ming Ming文檔中的MapperExtension。 在創建文檔時，我得到：

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

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

Answer 1

事實證明， MapperExtension基類存在一個錯誤，該錯誤現在已在master分支和文檔中修復。