Dynamic S3 Buckets

Let's say you want to store files uploaded by users into different S3 buckets, depending on each user's region. You can define your buckets in Shrine.storages and use the default_storage plugin to autoconfigure the correct one:

Shrine.storages = {
  # ...
  store_us: Shrine::Storage::S3.new(bucket: "myapp-files-us", region: "us-east-1",    ...)
  store_eu: Shrine::Storage::S3.new(bucket: "myapp-files-eu", region: "eu-contral-1", ...)
  # ...
}

Shrine.plugin :default_storage

Shrine::Attacher.default_store do
  :"store_#{record.user.region}"
end

If the set of possible storage destinations is not bounded, you can use the dynamic_storage plugin to dynamically resolve storage configuration:

Shrine.plugin :dynamic_storage

Shrine.storage /store_(\w+)/ do |match|
  Shrine::Storage::S3.new(...)
end