如何自动更新字典

Question

我有一个模型，看起来像这样:

class TestDoc(Document):
    name = StringField()
    friends = ListField(StringField())
    address_book = DictField()

并且我希望在好友列表更改时自动更新address_book字段。如何在原子操作中修改这两个字段?我在文档中找不到任何修饰符:

https://mongoengine-odm.readthedocs.org/en/latest/guide/querying.html原子更新

对字典进行原子更新。谢谢!

Answer 1

当您每次从friends字段执行$push或$pull时，您也将在同一更新中修改address_book例如:

TestDoc(name="Sue", friends=["Bob", "Sarah"], 
        address_book={"Bob": "1 the farm", "Sarah": "Owl house"}).save()
TestDoc.objects(name="Sue").update(pull__friends="Bob", 
                                   unset__address_book__Bob=1)