ndb.ComputedProperty導致'RuntimeError：超過最大遞歸深度'

這是我的課Stat。我加入一個新的計算屬性來當我創建這個類的一個實例，它會自動總結各種計數現有類ndb.ComputedProperty導致'RuntimeError：超過最大遞歸深度'

class Stat(ndb.Model): 
    visit_count = ndb.IntegerProperty(default=0) 
    exit_count = ndb.IntegerProperty(default=0) 


    # New code 
    def _get_total_count(self): 
     return self.visit_count + self.exit_count 

    response_count = ndb.ComputedProperty(lambda self: self._get_total_count)

，並將其保存

stat = Stat(visit_count=0, exit_count=2) 
stat.put()

我得到這個異常類：

File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/ndb/model.py", line 1207, in _value_to_repr 
    return repr(val) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/ndb/model.py", line 3013, in __repr__ 
    rep = prop._value_to_repr(val) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/ndb/model.py", line 1207, in _value_to_repr 
    return repr(val) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/ndb/model.py", line 3013, in __repr__ 
    rep = prop._value_to_repr(val) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/ndb/model.py", line 1207, in _value_to_repr 
    return repr(val) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/ndb/model.py", line 3013, in __repr__ 
    rep = prop._value_to_repr(val) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/ndb/model.py", line 1207, in _value_to_repr 
    return repr(val) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/ndb/model.py", line 3013, in __repr__ 
    rep = prop._value_to_repr(val) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/ndb/model.py", line 1207, in _value_to_repr 
    return repr(val) 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/ndb/key.py", line 357, in __repr__ 
    if self.app() != _DefaultAppId(): 
    File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/ext/ndb/key.py", line 824, in _DefaultAppId 
    return os.getenv('APPLICATION_ID', '_') 
    File "/Users/antkong/dev/zeetings/zeetings-ve/bin/../lib/python2.7/os.py", line 515, in getenv 
    return environ.get(key, default) 
    File "/Users/antkong/dev/zeetings/zeetings-ve/bin/../lib/python2.7/UserDict.py", line 58, in get 
    def get(self, key, failobj=None): 
RuntimeError: maximum recursion depth exceeded

如果我刪除計算屬性，put可以執行沒有問題。

我怎樣才能解決這個問題？

來源

2016-01-14 Anthony Kong

response_count = ndb.ComputedProperty(lambda self: self._get_total_count)

意味着你要回你的ComputedProperty值是功能self._get_total_count - 你不調用它。

response_count = ndb.ComputedProperty(lambda self: self._get_total_count())

來源

2016-01-14 21:14:12 Greg

ndb.ComputedProperty導致'RuntimeError：超過最大遞歸深度'

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