检查s3存储桶中是否存在文件夹 [英] Check if folder exist in s3 bucket

问题描述

如何使用Ruby on Rails检查s3存储桶中是否存在某些文件夹?

How can I check if some folder exists in my s3 bucket using Ruby on Rails?

我正在使用AWS:S3官方gem初始化全局连接后

I’m using AWS:S3 official gem After initializing the global connection

AWS::S3::Base.establish_connection!(:access_key_id => 'my_key_id', :secret_access_key => ‘my_secret’) 

我的存储桶名为: myfirstbucket

其中的文件夹名为: my_folder

在my_folder内的文件名为: my_pic.jpg

With file inside my_folder named: my_pic.jpg

当我尝试检查是否存在 my_pic.jpg 时，效果很好

When I try to check if my_pic.jpg exist it work just fine

s3object.exists? "/my_folder/my_pic.jpg" , "myfirstbucket"
=>  True

如何仅检查文件夹是否存在?

How can I check only if the folder exists?

s3object = AWS::S3::S3Object
s3object.exists? "/my_folder/" , "myfirstbucket"
=>  False

推荐答案

使用 Bucket#objects :

bucket.objects({prefix: 'my/folder/'}).limit(1).any?

返回 ObjectSummary 资源的 Collection .没有API请求直到在集合上调用可枚举的方法为止. Client#list_objects 将被多次调用，直到每次 ObjectSummary 已产生.

Returns a Collection of ObjectSummary resources. No API requests are made until you call an enumerable method on the collection. Client#list_objects will be called multiple times until every ObjectSummary has been yielded.

- http://docs.aws.amazon.com/sdkforruby/api/Aws/S3/Bucket.html#objects-instance_method

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