InvalidDocumentError：创建“源”实例的无效数据。 SYNCSTATUS - “datetime.datetime”对象有没有属性“带”

Question

我不断收到试图查询下面描述的集合，当以下问题：

class HistorySync(DynamicEmbeddedDocument): 
    status = StringField() 
    oldestDate = DateTimeField() 

    def __init__(self, *args, **kwargs): 
     """Overload constructor to deal with history sync status documents""" 
     if 'oldestDate' in kwargs: 
      kwargs['oldestDate'] = dateparser.parse(kwargs['oldestDate']) 

     super(DynamicEmbeddedDocument, self).__init__(*args, **kwargs) 


class SyncStatus(DynamicEmbeddedDocument): 
    status = StringField() 
    synchedAt = DateTimeField() 
    newestDate = DateTimeField() 

    def __init__(self, *args, **kwargs): 
     """Overload constructor to deal with most recent sync status documents""" 
     if 'synchedAt' in kwargs: 
      kwargs['synchedAt'] = dateparser.parse(kwargs['synchedAt']) 

     if 'newestDate' in kwargs: 
      kwargs['newestDate'] = dateparser.parse(kwargs['newestDate']) 

     super(DynamicEmbeddedDocument, self).__init__(*args, **kwargs) 

class Source(UtilityDocument, DynamicDocument): 

    source = StringField(required=True) 
    sourceName = StringField(required=True) 
    supportedDataTypes = ListField(StringField()) 
    devices = ListField(StringField()) 
    connectedSince = DateTimeField() 
    externalId = StringField() 
    historySync = EmbeddedDocumentField(HistorySync) 
    syncStatus = EmbeddedDocumentField(SyncStatus) 

的主要文件（来源）能够在整个救细我的web应用程序，但每当我试图用语句如

Source.objects.first() 

我收到以下错误访问源文件：

Traceback (most recent call last): 
     File "<console>", line 1, in <module> 
     File "/Library/Python/2.7/site-packages/mongoengine/queryset/base.py", line 264, in first 
     result = queryset[0] 
     File "/Library/Python/2.7/site-packages/mongoengine/queryset/base.py", line 163, in __getitem__ 
     only_fields=self.only_fields) 
     File "/Library/Python/2.7/site-packages/mongoengine/base/document.py", line 725, in _from_son 
     raise InvalidDocumentError(msg) 
    InvalidDocumentError: Invalid data to create a `Source` instance. 
    syncStatus - 'datetime.datetime' object has no attribute 'strip' 

任何帮助，非常感谢。谢谢！

Answer 1

您可以使用

class Source(UtilityDocument, DynamicDocument): 
    syncStatus = EmbeddedDocumentField(SyncStatus) 

    def __init__(self,*args,**kwargs): 
     super(DynamicDocument, self).__init__(*args, **kwargs) 

    def __str__(self):` 
     return str(self.syncStatus) 

    @property 
    def syncStatus(self): 
     return str(self.syncStatus) 

这将返回当属性转换为字符串。