I’m going to show you a very simple way to upload your attachments or a picture using CarrierWave gem. Steps: 1. Open Terminal. 2. Create a new project terminal > rails new imageupload 3. Add this line to Gemfile gem ‘ carrierwave ‘ 4. terminal > bundle install 5. terminal > rails g uploader image 6. terminal > rails g scaffold Painting name:string image:string 7. terminal > rake db:migrate 8. Add this line to painting.rb (app/models/painting.rb) class Painting < ActiveRecord::Base mount_uploader :image, ImageUploader end 9. And then in your app/views/paintings/_form.html.erb edit your code, which become <%= f.label :image %> <%= f. text_field :image %> ...