问AttributeError：'str‘对象没有属性'client’
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Stack Overflow用户

提问于 2019-09-02 07:33:13

回答 1查看 2.1K关注 0票数 0

我有一个代码，在这里，我正在建立与MongoDB的连接。这个代码是

ConnectMongoDB.py：

import pymongo
from pymongo import MongoClient
from flask import Flask, render_template, request,redirect,url_for

app = Flask(__name__)

# Connection to MongoDB

class ConnectMdb:
    @staticmethod
    def connect2mongodb():
        global client
        try:
            client = pymongo.MongoClient("mongodb") # modified to avoid showing actual string. Kindly ignore this part.
            print("Connected to Avengers MongoClient Successfully!!!")
            print (type(client))
            print(client)
        except:
            print("Connection to MongoClient Failed!!!")

        #db = client.avengers_hack_db
        return("Connection established")

if __name__ == '__main__':
   ConnectMdb.connect2mongodb()

我将此脚本导入到另一个具有业务逻辑的程序中。以下是与这一问题相关的代码的某些部分：

ProcessData.py：

import pymongo
from pymongo import MongoClient
import datetime
import sys
from flask import Flask, render_template, request
#import ProcessTaskData
#import werkzeug
import ConnectMongoDB as cDB
app = Flask(__name__)

CMdb = cDB.ConnectMdb.connect2mongodb()

db = CMdb.client.avengers_hack_db

@app.route('/')
def index():
  return render_template('index.html')

@app.route('/Avengers',methods = ['POST'])  
def Avengers():
    ip = request.remote_addr
    Project_ID = request.form['pid'] 
    Name = request.form['pname'] 
    Resource_Names = request.form['rsrc']

    db.ppm_master_db_collection.insert_many([
            {"Org_Id":"",
             "Name": Name,     
             "last_modified": datetime.datetime.utcnow()}
        ]) 
    return render_template('ptasks.html', user_ip=ip)   

@app.route('/ProjectTasks',methods = ['POST'])  
def ProjectTask():
    ip = request.remote_addr
    Task_ID = request.form['tid'] 
    TAlert = request.form['talrt']
    TResource_Names = request.form['trsrc']

    db.ppm_tasks_data_collection.insert_many([
            {"Task_ID": Task_ID,
             "Resource_Names": TResource_Names,
             "last_modified": datetime.datetime.utcnow()}
            ])  
    return render_template('ptasks.html', user_ip=ip)

if __name__ == '__main__':  
   app.run(debug = True)

如果我将来自ConnectMongoDB.py的代码直接放在ProcessData.py中而不是导入，它就能正常工作。但从单独的文件中看，它是错误的。

此外，客户端类型为：

 <class 'pymongo.mongo_client.MongoClient'>

理想情况下，它应该正常运行(也建立到db的连接)，就像代码在ProcessData.py中时一样。不知道我在哪里失踪了。

flask

python

mongodb

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回答 1

Stack Overflow用户

回答已采纳

发布于 2019-09-02 12:05:37

将db = CMdb.client.avengers_hack_db更改为db = cDB.client.avengers_hack_db会使错误消失，您引用的是错误的东西。静态方法的返回值是一个字符串，它没有client属性。

一个更好的方法是如果您的connect2mongodb方法将return client

class ConnectMdb:
    @staticmethod
    def connect2mongodb():
        try:
            client = pymongo.MongoClient("mongodb") # modified to avoid showing actual string. Kindly ignore this part.
            print("Connected to Avengers MongoClient Successfully!!!")
            print (type(client))
            print(client)
        except:
            raise Exception("Connection to MongoClient Failed!!!")

        return client