NameError (uninitialized constant Paperclip::Storage::S3::AWS):

I'm trying to incorporate images into my web app and I keep running into this error after removing quite a few features. It came down to my 'create' application controller and I'm not entirely sure where I should go from here.

2015-02-06T20:30:12.292187+00:00 app[web.1]:    (1.9ms)  ROLLBACK
2015-02-06T20:30:12.296299+00:00 app[web.1]: NameError (uninitialized constant Paperclip::Storage::S3::AWS):
2015-02-06T20:30:12.296301+00:00 app[web.1]:   app/controllers/articles_controller.rb:24:in `create'
2015-02-06T20:45:14.691084+00:00 app[web.1]: [paperclip] saving /articles/images/000/000/013/original/git.jpeg
2015-02-06T20:45:14.698744+00:00 app[web.1]: Completed 500 Internal Server Error in 584ms
2015-02-06T20:45:14.700871+00:00 heroku[router]: at=info method=POST path="/articles" host=preston.herokuapp.com request_id=d9d02257-3616-4686-bce5-3d912cd528c2 fwd="76.22.102.38" dyno=web.1 connect=1ms service=698ms status=500 bytes=1754

Articles_controller.rb

class ArticlesController < ApplicationController
http_basic_authenticate_with name: "name", password: "password", except: [:index, :show]

	def index
		@articles = Article.all.order("created_at DESC")
	end
	
	def show
		@article = Article.find(params[:id])
	end

	def new
		@article = Article.new
	end 

	def edit
		@article = Article.find(params[:id])

	end

	def create
		@article = Article.new(article_params)

		if @article.save
		  redirect_to @article
		else
			render 'new'
		end  
	end

	def update
		@article = Article.find(params[:id])

		if @article.update(article_params)
			redirect_to @article
		else
			render 'edit'
		end
	end

	def destroy
		@article = Article.find(params[:id])
		@article.destroy

		redirect_to articles_path
	end

	private

	def article_params
		params.require(:article).permit(:title, :text, :image)
	end
end

Gemfile

source 'https://rubygems.org'
ruby '2.0.0'

gem 'rails', '4.2.0'
gem 'sass-rails', '~> 5.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.1.0'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 2.0'
gem 'bootstrap-sass', '~> 3.3.3' 
gem 'autoprefixer-rails'
gem 'paperclip', '~> 4.2.1'
gem 'aws-sdk', '~> 2.0.22'

group :development, :test do
 gem 'byebug'
 gem 'web-console', '~> 2.0'
 gem 'spring'
 gem 'sqlite3'
end

group :production do
    gem 'pg'
    gem 'rails_12factor'
end

group :doc do
	gem 'sdoc', '~> 0.4.0', require: false
end

Modify your Gemfile's aws-sdk to install a version prior to 2.0:

gem 'aws-sdk', '< 2.0'

This issue was introduced with new version of aws-sdk (2.0+). You can read more here: http://ruby.awsblog.com/post/TxFKSK2QJE6RPZ/Upcoming-Stable-Release-of-AWS-SDK-for-Ruby-Version-2

There is official solution Use paperclip from this branch: it works with aws-sdk versions above 2

gem 'paperclip', :git=> 'https://github.com/thoughtbot/paperclip', :ref => '523bd46c768226893f23889079a7aa9c73b57d68'

just add :s3_region parameter to your paperclip s3 config

works for me

I got it to work by navigating to my gem folder and changing the Gems to:

• gem ‘paperclip’
• gem ‘aws-sdk’

The version declarations can be dropped.

To avoid getting a gem.lock error, run bundle update instead of bundle install, otherwise only the gems will be updated.

Now, the heroku logs -t command can be used to monitor the heroku server to image uploads.

I orginally received a new error, Access Denied Error for AWS server.

To fix this I found the Active Access Key ID with the latest date on the Amazon websiteand used heroku commands to input the latest Access key ID and Secret access key.

This enabled me to view my image on heroku.

I had made so many Access key ID and Secret access keys trying to fix the problem, but found the Gems to be the real problem.

Tip: Save all your Access Key info to OneNote, Notepad, etc. This way you can return and check them.

Paperclip use to use AWS-SDK v1 in versions 4.3 and bellow. They are trying to include the AWS-SDK v2

official upgrade document https://github.com/thoughtbot/paperclip/blob/master/UPGRADING

##################################################
#  NOTE FOR UPGRADING FROM 4.3.0 OR EARLIER       #
##################################################

Paperclip is now compatible with aws-sdk >= 2.0.0.

If you are using S3 storage, aws-sdk >= 2.0.0 requires you to make a few small
changes:

* You must set the `s3_region`
* If you are explicitly setting permissions anywhere, such as in an initializer,
  note that the format of the permissions changed from using an underscore to
  using a hyphen. For example, `:public_read` needs to be changed to
  `public-read`.

due to some backwards incomparability (read this https://github.com/thoughtbot/paperclip/issues/2021) this is merged but officially not released yet, but should be released in Paperclip v 5.0.0

So like Vitali Mogilevsky mentioned, you have to use this for now:

# Gemfile
# ...
gem 'paperclip', :git=> 'https://github.com/thoughtbot/paperclip', :ref => '523bd46c768226893f23889079a7aa9c73b57d68'

When Paperclip 5.0 is released, AWS-SDK v2 should be included