Ming MapperExtensions usag公司

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='')

我试过使用官方文档中的MapperExtension。 关于创建文档，我得到：

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

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

Answer 1

原来MapperExtension基类有一个bug，现在已经在主分支和文档中修复了。你知道吗