AWS S3 upload file with Ruby/Rails

aws_sdk_ruby_s3_upload_file

Using gem aws-sdk for a ror application for uploading images to s3
Uploading images to a fixed bucket with different folders for each object or application.
The s3 keeps a limitation on the number of buckets creattion whereas there is no
limitation for content inside a bucket.

This code will upload image for a user to s3 using aws-sdk gem. The bucket and the image uploaded are made public 
so that the images uploaded are directly accessible


Method for aws-sdk v3

1. In bash (terminal) set ENV vars
   export AWS_ACCESS_KEY_ID='your_key_id'
   export AWS_SECRET_ACCESS_KEY='your_secret_key'
2. code to upload
   require 'aws-sdk'
   s3 = Aws::S3::Resource.new(region: 'us-east-2') #check your region in s3 dashboard
   bucket = 'your_bucket_name'
   name = File.basename('/path/to/file.jpg')
   obj = s3.bucket(bucket).object(name)
   obj.upload_file(image_location)
   obj.public_url.to_s #returns public url of file at s3 server

If smth wrong check:
-region
-bucket_name and if it exists
-permissions in s3 dashboard
-CORS configuration, for example
<?xml version="1.0" encoding="UTF-8"?>
<CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
<CORSRule>
<AllowedOrigin>http://localhost:3000</AllowedOrigin>
<AllowedMethod>GET</AllowedMethod>
<AllowedMethod>POST</AllowedMethod>
<AllowedMethod>PUT</AllowedMethod>
<AllowedHeader>*</AllowedHeader>
</CORSRule>
</CORSConfiguration>