Mongoengine 试图访问对抽象类的子类的引用
我的设置中的相关类:Mongoengine 试图访问对抽象类的子类的引用,mongoengine,Mongoengine,我的设置中的相关类: 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>
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
这会产生一个错误:
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'
当我查看db条目时,我可以看到items
字段确实有一系列对数据库中存在的文档的引用:
知道罪魁祸首是什么吗?我认为这与以下事实有关:MenuItem
是一个抽象类,可能与此相关
我在跑步
flask-mongoengine==0.9.3
flask-restplus==0.10.1
mongoengine==0.13.0
pymongo==3.4.0
我不知道你是什么意思,但我运行了下面的代码片段,它运行得很好~~你最好提供示例代码,让我们运行以重现错误
from mongoengine import *
from datetime import datetime
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 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 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
if __name__ == '__main__':
host = 'mongodb://localhost:27017/demo'
connect(host=host)
now = datetime.now()
m = Menu(date=now)
m.save()
menu = Menu.objects.get(date=now)
print menu
print menu.items
来自mongoengine导入的*
从日期时间导入日期时间
类菜单项(动态文档):
元={
“抽象”:正确
}
@静力学方法
def get_class_类型(有效负载):
如果有效负载==“url”:
返回菜单菜单菜单
elif有效负载=='string':
返回菜单异常
raise VALUERROR('菜单项的有效负载类型未知')
类菜单(动态文档):
日期=日期时间字段(必需=真,唯一=真)
items=ListField(ReferenceField('MenuItem',required=True,reverse\u delete\u rule=CASCADE))
定义报告(自我):
返回“”%self.date
类别MenuItem(MenuItem):
name=StringField(必需=True)
special=ListField(StringField(最小长度=1,最大长度=30),required=False)
定义报告(自我):
返回“%self.name”
类MenuItemURL(MenuItem):
url=URLField(必需=True)
定义报告(自我):
返回“%self.url”
如果uuuu name uuuuuu='\uuuuuuu main\uuuuuuu':
主持人mongodb://localhost:27017/demo'
连接(主机=主机)
now=datetime.now()
m=菜单(日期=现在)
m、 保存()
menu=menu.objects.get(date=now)
打印菜单
打印菜单项
from mongoengine import *
from datetime import datetime
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 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 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
if __name__ == '__main__':
host = 'mongodb://localhost:27017/demo'
connect(host=host)
now = datetime.now()
m = Menu(date=now)
m.save()
menu = Menu.objects.get(date=now)
print menu
print menu.items