MongoEngine 插入查询

Question

我有模特User

class User(db.DynamicDocument):
    user_id = db.UUIDField(primary_key=True,required=True,default=uuid.uuid4)
    name = db.StringField(default='')
    phone = db.ListField(db.StringField,default=list)
    gcm_details = db.ListField(db.EmbeddedDocumentField('UserGCM'),default=list)

其中gcm_details是一个EmbeddedDocumentField，其详细信息如下：-

class UserGCM(db.EmbeddedDocument):
    gcm_key = db.StringField(default='')
    device_id = db.StringField(default='')

我执行插入查询如下：-

name = 'something'
phone = ['12345678','456789']
gcm_obj = UserGCM(gcm_key=gcm_key,device_id=device_id)

user = User(name=name,push__phone=phone,push__gcm_details=gcm_obj).save()

这已保存。但是，当我在 mongo shell 中看到详细信息时，我得到以下文档。

{
    "_id": BinData(3,
    "MjpPJaNTQ823WuA8BP47jQ=="),
    "parent_id": BinData(3,
    "Ig7LNNAVQzCbjYG2KXvQjw=="),
    "name": "something",
    "phone": [

    ],

    "gcm_details": [

    ],

    "push__phone": [
        "9999999999"
    ],
    "push__gcm_details": {
        "gcm_key": "string",
        "device_id": "string",
        "_cls": "UserGCM"
    }
}

注意空的 phone 和 gcm_details 字段，并添加了 push__phone 和 push__gcm_details 字段。这是怎么回事？

如果我这样做

user = User(name=name,phone=phone,gcm_details=gcm_obj).save()

不使用 push__，它会抛出一条错误消息：-

TypeError: unbound method _validate() must be called with StringField instance as first argument (got unicode instance instead)

这是怎么回事？我做错了什么？

Answer 1

你的错误在这里：

phone = db.ListField(db.StringField, default=list)

您应该像这样使用 StringField 的实例：

phone = db.ListField(db.StringField(), default=list)

那么你就可以为所欲为了：

name = 'something'
phone = ['12345678', '456789']
gcm = UserGCM(gcm_key=gcm_key, device_id=device_id)
user = User(
    name=name,
    phone=phone,
    gcm_details=[gcm],
).save()

MongoEngine 插入查询

MongoEngine Insert Queries

python

mongodb

mongoengine

flask

mongodb-query