AWS S3 integration yields undefined method `match' - ruby-on-rails

Question

I'm working on a simple project using Paperclip to upload images. Everything has been working just fine until I attempted to integrate S3 with Paperclip. Upon 'uploading' a user's image I get a NoMethodError (undefined method 'match' for nil:NilClass): error. This only happens when I have my S3 configuration running - if I comment it out the file uploads perfectly.
My configuration:
development.rb:
....
....
config.paperclip_defaults = {
:storage => :s3,
:s3_credentials => {
:bucket => ENV['AWS_BUCKET_ID'],
:access_key_id => ENV['AWS_ACCESS_KEY_ID'],
:secret_access_key => ENV['AWS_SECRET_ACCESS_KEY']
}
}
My Model:
class User < ActiveRecord::Base
has_attached_file :image_file, default_url: "/myapp/images/:style/missing.png"
validates_attachment_file_name :image_file, matches: [/png\Z/, /jpeg\Z/, /tiff\Z/, /bmp\Z/, /jpg\Z/]
entire error output from console:
NoMethodError (undefined method `match' for nil:NilClass):
app/controllers/images_controller.rb:33:in `block in create'
app/controllers/images_controller.rb:32:in `create'
Things I tried:
I added the AWS keys and bucket name directly into the code instead
of as an environmental variable.
As mentioned above, I commented out the AWS configuration in my environment file and it seemed to work perfectly.
It's probably worth mentioning that I installed the fog gem earlier to start configuring for Google Cloud Storage, but decided to stick with S3 instead. I used gem uninstall fog to remove the gem but it appears some dependencies stayed behind.

Answer 1

Add :s3_region to your config map:
E.g.
config.paperclip_defaults = {
:storage => :s3,
:s3_credentials => {
:bucket => ENV['AWS_BUCKET_ID'],
:access_key_id => ENV['AWS_ACCESS_KEY_ID'],
:secret_access_key => ENV['AWS_SECRET_ACCESS_KEY']
},
:s3_region => ENV['AWS_REGION']
}
Unfortunately this is a v5.0.0 feature (in Beta). And therefore there's nothing about it in the docs. However there is a comment about it in the actual 5.0 code.
Also good to note that the s3_permissions key in papertrail expects a string value now (it used to accept symbols).
:s3_permissions => 'public-read'

Answer 2

You need to specify the region in you s3_credentials, in a way such as region: ENV["AWS_REGION"].
As for cleaning up unused gems you can run bundle clean.