How to read file from s3?

Question

I'm trying to read a CSV file directly from s3.

I'm getting the s3 URL but I am not able to open it as it's not in the local system. I don't want to download the file and read it.

Is there any other way to achieve this?

Answer 1

There are few ways, depending on the gems that you are using. For example, one of the approaches from official documentation:

s3 = Aws::S3::Client.new
resp = s3.get_object(bucket:'bucket-name', key:'object-key')

resp.body
#=> #<StringIO ...> 

resp.body.read
#=> '...'

Or if you are using CarrierWave/Fog:

obj = YourModel.first
content = obj.attachment.read

Answer 2

You can open the file from URL directly:

require 'open-uri'
csv = open('http://server.com/path-to-your-file.csv').read