不能在pymongo的集合实例中使用find（）-can'tusefind()incollectioninstanceinpymongo

I have a class:

我有一节课:

import sys
import os
import pymongo
from pymongo import MongoClient

class Collection():
    def __init__(self, db, collection_name):
        self.db = db
        self.collection_name = collection_name

        if not hasattr(self.__class__, 'client'):
            self.__class__.client = MongoClient()

        self.data_base = getattr(self.client, self.db)
        self.collection = getattr(self.data_base, self.collection_name)

I created class instances as follows:

我创建了类实例,如下所示:

    def getCollections(self):
        collections_dict = {}
        for i in range(len(self.db_collection_names)):
            collections_dict[self.db_collection_names[i]] = Collection(self.database_name, self.db_collection_names[i])
        return collections_dict

db_collection_names contains email_logs. I created an emails instance as follows:

db_collection_names包含email_logs。我创建了一个电子邮件实例,如下所示:

emails = collections_dict['email_logs']

print emails yields

打印电子邮件会产生

print emails.find() yields:

print emails.find()产生:

Traceback (most recent call last):
  File "main.py", line 75, in 
program.runProgram()
  File "main.py", line 63, in runProgram
print emails.find
AttributeError: Collection instance has no attribute 'find'

Why the error?

为什么错误?

2 个解决方案

from pymongo import MongoClient

db = MongoClient().my_database  # create an instance of pymongo Database
emails = db.emails  # create an instance of pymongo Collection

emails.find()  # yeilds a pymongo Cursor (containing the query results)

emails.collection.find()