AWS::S3::Errors::NoSuchKey: No Such Key error - ruby-on-rails

Question

I'm trying to create a method that deletes files on an S3 instance, but I am getting a AWS::S3::Errors::NoSuchKey: No Such Key error when I try to call .head or .read on an object.
app/models/file_item.rb
def thumbnail
{
exists: thumbnailable?,
small: "http://#{bucket}.s3.amazonaws.com/images/#{id}/small_thumb.png",
large: "http://#{bucket}.s3.amazonaws.com/images/#{id}/large_thumb.png"
}
end
lib/adapters/amazons3/accessor.rb
module Adapters
module AmazonS3
class Accessor
S3_BUCKET = AWS::S3.new.buckets[ENV['AMAZON_BUCKET']]
...
def self.delete_file(thumbnail)
prefix_pattern = %r{http://[MY-S3-HOST]-[a-z]+.s3.amazonaws.com/}
small_path = thumbnail[:small].sub(prefix_pattern, '')
large_path = thumbnail[:large].sub(prefix_pattern, '')
small = S3_BUCKET.objects[small_path]
large = S3_BUCKET.objects[large_path]
binding.pry
S3_BUCKET.objects.delete([small, large])
end
end
end
end
example url1
"http://projectname-staging.s3.amazonaws.com/images/994/small_thumb.png"
example url2
"http://projectname-production.s3.amazonaws.com/images/994/large_thumb.png"

Answer 1

assuming awssdk v1 for ruby.
small = S3_BUCKET.objects[small_path]
does not actually get any objects.
from: https://docs.aws.amazon.com/AWSRubySDK/latest/AWS/S3/Bucket.html
bucket.objects['key'] #=> makes no request, returns an S3Object
bucket.objects.each do |obj|
puts obj.key
end
so you would need to alter your code to something like:
to_delete = []
S3_BUCKET.objects[small_path].each do |obj|
to_delete << obj.key
end
S3_BUCKET.objects[large_path].each do |obj|
to_delete << obj.key
end
S3_BUCKET.objects.delete(to_delete)
just banged out the code, so the idea is there, you might need to correct/polish it a bit

Answer 2

I was able to come of with a kind of different solution thanks to your answer of #Mircea above.
def self.delete_file(thumbnail)
folder = thumbnail[:small].match(/(\d+)(?!.*\d)/)
to_delete = []
S3_BUCKET.objects.with_prefix("images/#{folder}").each do |thumb|
to_delete << thumb.key
end
# binding.pry
S3_BUCKET.objects.delete(to_delete)
end