Mongoengine 连接失败：您尚未定义默认连接

Question

启动一个 python 项目，将 fastapi 与 mongoengine 结合使用。昨天还正常，今天运行任意一个有数据库连接的方法，出现连接失败错误（mongoengine.connection.ConnectionFailure：你没有定义默认连接）。

我的联系人：

from mongoengine import connect

connect(db="mydb", host='localhost', port=27017, alias='default')

我的模特：

from mongoengine.document import Document
from mongoengine.fields import StringField, BooleanField, ListField, ReferenceField
from mongoengine import PULL


class Permissao(Document):
    permissao = StringField()


class Grupo(Document):
    grupo = StringField()
    
    permissoes = ListField(ReferenceField('Permissao', reverse_delete_rule=PULL))


class Usuario(Document):
    nome_usuario = StringField()
    ativo = BooleanField()
    senha = StringField()
    
    grupos = ListField(ReferenceField('Grupo', reverse_delete_rule=PULL))
    permissoes = ListField(ReferenceField('Permissao', reverse_delete_rule=PULL))

Answer 1

成功了，我将连接切换到模型并放置了一个元字段，请在下面查看：

from mongoengine.document import Document
from mongoengine.fields import StringField, BooleanField, ListField, ReferenceField
from mongoengine import PULL
from mongoengine import connect

connect(db="mydb", host="localhost", port=27017, alias="mydb-alias")

class Permissao(Document):
    permissao = StringField()

    meta = {"db_alias" : "mydb-alias" , "collection" : "permissao"}


class Grupo(Document):
    grupo = StringField()
    
    permissoes = ListField(ReferenceField('Permissao', reverse_delete_rule=PULL))
    
    meta = {"db_alias" : "mydb-alias" , "collection" : "grupo"}


class Usuario(Document):
    nome_usuario = StringField()
    ativo = BooleanField()
    senha = StringField()
    
    grupos = ListField(ReferenceField('Grupo', reverse_delete_rule=PULL))
    permissoes = ListField(ReferenceField('Permissao', reverse_delete_rule=PULL))

    meta = {"db_alias" : "mydb-alias" , "collection" : "usuario"}

Mongoengine 连接失败：您尚未定义默认连接

Mongoengine Connection Failure: You have not defined a default connection

python

mongoengine

fastapi