在 python 中使用 pymongo 使用 db.collection.count() 函数时出现 DeprecationWarning？

Question

我正在使用

MongoDB shell version v4.4.0 and pymongo 3.10.0 version

当我使用 any_db.any_collection.count() 或 any_db.any_collection.count({}) 控制台时显示警告

DeprecationWarning: count is deprecated. Use estimated_document_count or count_documents instead. Please note that $where must be replaced by $expr, $near must be replaced by $geoWithin with $center, and $nearSphere must be replaced by $geoWithin with $centerSphere
  print(f'Total Categories = {db.rank_list_category.count({})}')

我的代码：

import pandas as pd
from src.utils import get_full_path
from pymongo import MongoClient
from bson.objectid import ObjectId

client = MongoClient('localhost', 27017)
db = client['techexpert']

print(f'Total Categories = {db["rank_list_category"].count({})}')

输出：

Total Categories = 5

    /home/mobin/PycharmProjects/IMDb/src/database/database_service_provider.py:17: DeprecationWarning: count is deprecated. Use estimated_document_count or count_documents instead. Please note that $where must be replaced by $expr, $near must be replaced by $geoWithin with $center, and $nearSphere must be replaced by $geoWithin with $centerSphere
  print(f'Total Categories = {db.rank_list_category.count({})}')

Answer 1

您收到此警告是因为 pymongo 弃用了 count 函数，这意味着您不应再在新代码中使用它。

更改您的用途：

db.collection.count({})

到

db.collection.count_documents({})

Answer 2

如前所述in the documentation

The count() method is deprecated and not supported in a transaction. Please use count_documents() or estimated_document_count() instead.

When migrating from count() to count_documents() the following query operators must be replaced - $where, $near, $nearSphere

Changed in version 3.7: Deprecated.

所以使用count_documents

在 python 中使用 pymongo 使用 db.collection.count() 函数时出现 DeprecationWarning？

getting DeprecationWarning while using db.collection.count() function using pymongo in python?

python

mongodb

pymongo

python-3.x