Multiform fileupload demo with Ruby on Rails 4, jquery-fileupload-rails, bootstrap 3 and paperclip

When I was building my own project I got one problem: I needed one page, on which user creates a new models instance with params and add multiple photos, which are belong_to this model. Yes, I can use "multiple" tag for a file input, but I need to show user his photos before upload.
I really believe that it is a common usercase, but I didn't find any demo or tutorial to build this with jquery-file-upload. So I built it myself.

Attention:

You need ImageMagick to be installed on your system to run this. To install it on OSX with Homebrew use brew install imagemagick

Gems:

• paperclip
• jquery-fileupload-rails
• anjlab-bootstrap-rails

To use my demo:

• git clone
• cd
• bundle install
• rake db:migrate
• rails s

To start from a scratch:

• install gems
• add necessary stylesheets and js
• rails g scaffold item name:string model:string price:integer
• rails g scaffold upload item_id integer
• rails g paperclip upload upload
• rake db:migrate
• fill models
• add uploads_attributes to items_controller (in params.require)
• add upload destroy to items_controller (in destroy method) (this makes photos to be deleted with item destroy)
• edit new_item view
• edit index_item view