MongoDB更新:无法使用flask API更新MongoDB中的文档

from pymongo import MongoClient

# 连接到MongoDB数据库
client = MongoClient('mongodb://localhost:27017/')

# 获取数据库实例
db = client['database_name']

# 获取集合实例
collection = db['collection_name']

# 获取集合实例
collection = db['collection_name']

from flask import Flask, request
from pymongo import MongoClient

# 创建Flask应用
app = Flask(__name__)

# 连接到MongoDB数据库
client = MongoClient('mongodb://localhost:27017/')
db = client['database_name']
collection = db['collection_name']

# 定义更新文档的API路由
@app.route('/update_document', methods=['POST'])
def update_document():
    data = request.json
    document_id = data['document_id']
    updated_fields = data['updated_fields']

    # 更新文档
    collection.update_one({'_id': document_id}, {'$set': updated_fields})

    return 'Document updated successfully'

# 运行Flask应用
if __name__ == '__main__':
    app.run()