Paperclip Example with Rails 4.2

###Credits:

• Pete Mitchell
• Deirdre Allison
• Paperclip documentation
• Paperclip Demo

###Additional gems you will need:

• gem 'rails', '~> 4.2.0.beta2'
• gem 'aws-sdk'
• gem 'dotenv-rails'
• gem 'paperclip'

###Set up Paperclip:

Follow Paperclip documentation:

• Paperclip requires ImageMagick brew install imagemagick for OSX

• Edit Model

class User < ActiveRecord::Base
  has_attached_file :avatar, styles: { medium: '300x300>', thumb: '100x100>' }, default_url: '/images/:style/missing.png'
  validates_attachment_content_type :avatar, content_type: /\Aimage\/.*\Z/
end

• Add migration for Avatar rails generate paperclip user avatar should look like this:

class AddAttachmentAvatarToUsers < ActiveRecord::Migration
  def self.up
    change_table :users do |t|
      t.attachment :avatar
    end
  end

  def self.down
    remove_attachment :users, :avatar
  end
end

• Update Edit and New views or form partial to include this line: <%= f.file_field :avatar %>

• Add Avatar to strong params in Controller:

 def user_params
    params.require(:user).permit(:name, :avatar)
  end

• Add to User show view: <%= image_tag @user.avatar.url(:medium) %>

###Configure S3 (requires S3 Bucket from AWS)

Add environment variables (see .sample_env):

S3_BUCKET_NAME: yourbucketname
AWS_ACCESS_KEY_ID: youraccesskeyhere
AWS_SECRET_ACCESS_KEY: yoursecretkeyhere

In config/environments add the following in each environment you want image uploading to S3 to work in:

 config.paperclip_defaults = {
   storage: :s3,
   s3_credentials: {
     bucket: ENV['S3_BUCKET_NAME'],
     access_key_id: ENV['AWS_ACCESS_KEY_ID'],
     secret_access_key: ENV['AWS_SECRET_ACCESS_KEY']
   }
 }

 Paperclip.options[:command_path] = '/usr/local/bin/'

And you are ready to upload images to your Rails 4.2 app! Check out the example screenshots below. Happy coding!

Uploading Image

Confirmation