为什么flask-pymongo-bulk-writes方法不存在?

我有一些这样的代码片段:

from flask import Flask
from flask_pymongo import PyMongo
from pymongo import InsertOne, UpdateOne, DeleteOne, ReplaceOne
from flask import jsonify

app = Flask(__name__)
app.config['MONGO_DBNAME'] = 'MyDB'

mongo = PyMongo(app)
coll = mongo.db['collection1']

requests = []
for d in data_to_delete:
    requests.append(DeleteOne({'key1': d}))

result = coll.bulk_writes(requests)

return jsonify(result=result.deleted_count)

当我尝试执行它时,会收到错误消息:

TypeError: 'Collection' object is not callable. If you meant to call the 'bulk_writes' method on a 'Collection' object it is failing because no such method exists.

PyMongo documentation 说的是 Collection 对象有这个方法,尽管我知道 Flask-Pymongo 是包装纸吗 PyMongo . 有什么问题,我怎么用 bulk_writes() 具有 烧瓶皮蒙 收藏?

谢谢你的帮助!