ChangeNotifierProxyProvider 构建器来创建和更新

如何解决ChangeNotifierProxyProvider 构建器来创建和更新

此代码使用的是旧提供程序，我需要将其转换为最新的 ChangeNotifierProxyProver [![在此处输入图片描述][1]][1]

像上面这样 我的代码：

 ChangeNotifierProxyProvider<Auth,Products>(
        
          builder: (ctx,auth,prevIoUsProducts) => Products(
            auth.token,auth.userId,prevIoUsProducts == null ? [] : prevIoUsProducts.items,),

Products 类需要 3 个参数

Products(token,userId,listofItems)

现在需要创建和更新 ChangeNotifierProxyProvider。 如何转换它 [1]：https://i.stack.imgur.com/p1tsp.png

解决方法

你可以这样做。

import logging
import boto3

logger = logging.getLogger()
logger.setLevel(logging.INFO)

s3 = boto3.client('s3')

def lambda_handler(event,context):

    bucket_name = event['Records'][0]['s3']['bucket']['name']
    file_key = event['Records'][0]['s3']['object']['key']
    logger.info('Reading {} from {}'.format(file_key,bucket_name))

    obj = s3.get_object(Bucket=bucket_name,Key=file_key)
    #Process this object for my use case - as pandas dataframe or something else?

    cloudwatch = boto3.client('cloudwatch')
    response = cloudwatch.put_metric_data(
        MetricData = [
            {
                #need to send everything in 'col1' of csv
            },{
                #need to send everything in 'col2' of csv
            },],Namespace = 'MyNamespace'
    )