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问题描述

有点背景知识,我之前在 node.js 和 mongoose.js 中使用过 MongoDB.现在我决定尝试使用 python 和 pymongo.但是当我尝试将一个文档插入到我的收藏中时,我却得到了一个错误:

So a little background, I've worked with MongoDB before in node.js with mongoose.js. And now I decided to try out to work with python and pymongo. But when I try to insert a document into my collection I just get an error off:

pymongo.errors.DuplicateKeyError: E11000 duplicate key error index: database.emails.$email_1 dup key: { : "[email protected]" }

我一直在互联网上四处寻找 Python 和其他语言的解决方案.这很可能是因为 iv 之前只使用 mongoose.js 与 mongo 交谈,而我可能无法完全掌握 MongoDB 的基础知识.

I have been looking around on the internet for a solution both in python but also in other languages. It might very well be that sense iv only used mongoose.js to talk to mongo before and that I might not fully grasp the basics off MongoDB.

来自model.py

from pymongo import MongoClient

class Model(object):
    client = MongoClient()
    db = client["database"]
    collection_name = ""

    def __init__(self):
        self.collection = self.db[self.collection_name]

    def save(self, data):
        self.collection.insert_one(data)

来自 Post.py

from model import Model

class Post(Model):

    collection_name = "emails"

    def __init__(self):
        super(Post, self).__init__()

在 app.py 中我只是做

And in app.py I just do

from models.Post import Post

post = Post()
post.save({"email":"[email protected]", "name":"bob"})

当数据库中没有文档时,它插入正常.但是,如果我再次尝试插入相同的内容,则会出现 DuplicateKeyError.好像 MongoDB 期望所有字段都具有唯一性,还是我误解了流程?

When there is no document in the database it inserts fine. But if I try to insert the same again I get the DuplicateKeyError. It is as if MongoDB expects all the fields to have a unique or am I misunderstanding the processes?

我使用的是最新版本的 pymongo.

Im using the latest version of pymongo.

推荐答案

根据错误判断,您实际上为 email 字段定义了一个唯一索引.

Judging by the error, you actually have a unique index defined for the email field.

仅供参考,您可以使用index_information() 方法:

FYI, you can get the index information using index_information() method:

self.collection.index_information()

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08-10 22:53