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我怎样才能替换 ORM 类 - 所以它不应该导致递归!

问题
原始类有超级调用,当它被替换时 - 它会导致自继承并导致最大递归深度超过异常。
即类 orm 正在调用 super(orm, self).... 并且 orm 已被另一个继承原始 orm 的类取代....

包裹 !

addons  __init__.py  osv  run_app.py

./addons:
__init__.py  test_app1.py  test.py

./osv:
__init__.py  orm.py

orm.py 的内容

class orm_template(object):
    def __init__(self, *args, **kw):
        super(orm_template, self).__init__()    
    def fields_get(self, fields):
        return fields    
    def browse(self, id):
        return id

class orm(orm_template):
    def __init__(self, *args, **kw):
        super(orm, self).__init__(*args, **kw)    
    def fields_get(self, fields, context = None):
        return super(orm, self).fields_get(fields)    
    def read(self, fields):
        return fields

插件/ init .py的内容

import test    
def main(app):
    print "Running..."
    __import__(app, globals(), locals())

addons/test.py 的内容

from osv import orm
import osv
class orm(orm.orm):
    def __init__(self, *args, **kw):
        super(orm, self).__init__(*args, **kw)    
    def fields_get(self, *args, **kw):
        print "my fields get................."
        return super(orm, self).fields_get(*args, **kw)    
osv.orm.orm = orm
print "replaced.........................."

test_app1.py 的内容

from osv.orm import orm    
class hello(orm):
    _name = 'hellos'    
    def __init__(self, *args, **kw):
        super(hello, self).__init__(*args, **kw)    
print hello('test').fields_get(['name'])

run_app.py 的内容

import addons
addons.main('test_app1')

输出

>>>python run_app.py

replaced..........................
Running...
...
...
super(orm, self).__init__(*args, **kw)
RuntimeError: maximum recursion depth exceeded

我看过类似的问题

4

1 回答 1

5

addons/test.py需要获取并保留对原始版本的引用orm.orm并使用它而不是替换版本。IE:

from osv import orm
import osv
original_orm = osv.orm
class orm(original_orm):
    def __init__(self, *args, **kw):
        super(orm, self).__init__(*args, **kw)    
    def fields_get(self, *args, **kw):
        print "my fields get................."
        return super(orm, self).fields_get(*args, **kw)    
osv.orm.orm = orm
print "replaced.........................."

因此,monkeypatched-in 类从原始类继承而不是从自身继承,就像您在设置中所拥有的那样。顺便说一句,如果您可以通过更好地设计osv模块来避免猴子修补(例如,使用 setter 函数来设置什么是 orm),您会更快乐;-)。

于 2010-09-23T18:17:40.417 回答