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相關的類在我的設置:試圖訪問一個抽象類的子類的引用
class Menu(DynamicDocument):
date = DateTimeField(required=True, unique=True)
...
items = ListField(ReferenceField('MenuItem', required=True, reverse_delete_rule=CASCADE))
def __repr__(self):
return '<Menu %r>' % self.date
class MenuItem(DynamicDocument):
meta = {
'abstract': True
}
@staticmethod
def get_class_type(payload):
if payload == 'url':
return MenuItemURL
elif payload == 'string':
return MenuItemOrdinary
raise ValueError('Unknown payload type for menu item')
class MenuItemOrdinary(MenuItem):
name = StringField(required=True)
special = ListField(StringField(min_length=1, max_length=30), required=False)
def __repr__(self):
return '<MenuItemOrdinary %r>' % self.name
class MenuItemURL(MenuItem):
url = URLField(required=True)
def __repr__(self):
return '<MenuItemURL %r>' % self.url
我試圖訪問的代碼文檔中的items
領域:
menu = Menu.objects.get(date=viewdate)
print menu
print menu.items
這將產生一個錯誤:
Menu object
...
File "/home/user/ll/venv/local/lib/python2.7/site-packages/mongoengine/dereference.py", line 148, in _fetch_objects
object_map[(collection, doc.id)] = doc
AttributeError: 'MenuItem' object has no attribute 'id'
當我看分貝項,我可以看到items
場確實有引用數組中存在的數據庫文件:
任何想法是罪魁禍首?我認爲這與MenuItem
是一個抽象類的事實有關,可能與此issue有關。
我跑
flask-mongoengine==0.9.3
flask-restplus==0.10.1
mongoengine==0.13.0
pymongo==3.4.0