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Rails file upload implementation with jQuery-File-Upload
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README.md

HTML5 File uploader for rails

This gem use https://github.com/blueimp/jQuery-File-Upload for upload files.

Install

In Gemfile:

gem 'rails-uploader'

In routes:

mount Uploader::Engine => '/uploader'

Migration for ActiveRecord:

$> rake uploader:install:migrations

Usage

Architecture to store uploaded files (cancan integration):

class Asset < ActiveRecord::Base
  include Uploader::Asset
end

class Picture < Asset
  mount_uploader :data, PictureUploader, mount_on: :data_file_name
  validates :data, file_size: { maximum: 5.megabytes.to_i }

  def thumb_url
    url(:thumb)
  end
end

For example user has one picture:

class User < ActiveRecord::Base
  has_one :picture, as: :assetable, dependent: :destroy

  fileuploads :picture
end

Find asset by foreign key or guid:

@user.fileupload_asset(:picture)

Include assets

Javascripts:

//= require uploader/application

Stylesheets:

*= require uploader/application

Views

<%= uploader_field_tag :article, :photo %>

or FormBuilder:

<%= form.uploader_field :photo, sortable: true %>

Formtastic

<%= f.input :pictures, as: :uploader %>

SimpleForm

<%= f.input :pictures, as: :uploader, input_html: { sortable: true } %>

Confirming deletions

This is only working in Formtastic and FormBuilder:

# formtastic
<%= f.input :picture, :as => :uploader, :confirm_delete => true %>
# the i18n lookup key would be en.formtastic.delete_confirmations.picture

Authorization

Setup custom authorization adapter and current user:

# config/initializers/uploader.rb
Uploader.setup do |config|
  config.authorization_adapter = CanCanUploaderAdapter
  config.current_user_proc = -> (request) { request.env['warden'].user }
end

CanCanUploaderAdapter class just create cancan ability object and call can? method with same args:

class CanCanUploaderAdapter < Uploader::AuthorizationAdapter
  def authorized?(action, subject = nil)
    cancan_ability.can?(action, subject)
  end

  def scope_collection(collection, action = :index)
    collection.accessible_by(cancan_ability, action)
  end

  protected

  def cancan_ability
    @cancan_ability ||= Ability.new(user)
  end
end

JSON Response

https://github.com/blueimp/jQuery-File-Upload/wiki/Setup#using-jquery-file-upload-ui-version-with-a-custom-server-side-upload-handler

Extend your custom server-side upload handler to return a JSON response akin to the following output:

{"files": [
  {
    "name": "picture1.jpg",
    "size": 902604,
    "url": "http:\/\/example.org\/files\/picture1.jpg",
    "thumb_url": "http:\/\/example.org\/files\/thumbnail\/picture1.jpg",
    "id": 1,
    "content_type": "image/jpg"
  },
  {
    "name": "picture2.jpg",
    "size": 841946,
    "url": "http:\/\/example.org\/files\/picture2.jpg",
    "thumb_url": "http:\/\/example.org\/files\/thumbnail\/picture2.jpg",
    "id": 2,
    "content_type": "image/jpg"
  }
]}

To return errors to the UI, just add an error property to the individual file objects:

{"files": [
  {
    "name": "picture1.jpg",
    "size": 902604,
    "error": "Filetype not allowed"
  },
  {
    "name": "picture2.jpg",
    "size": 841946,
    "error": "Filetype not allowed"
  }
]}

When removing files using the delete button, the response should be like this:

{"files": [
  {
    "picture1.jpg": true
  },
  {
    "picture2.jpg": true
  }
]}

Note that the response should always be a JSON object containing a files array even if only one file is uploaded.

Customize JSON response and views

To customize JSON response just overwrite to_fileupload method:

class Asset
  include Uploader::Asset

  def to_fileupload
    {
      id: id,
      name: filename,
      content_type: content_type,
      size: size,
      url:  url,
      thumb_url: thumb_url
    }
  end
end

For exsample let's overwrite id method to public_token method:

class Asset
  include Uploader::Asset

  def to_fileupload
    super.merge(id: public_token)
  end

  def self.fileupload_find_asset(params)
    where(public_token: params[:id]).first
  end
end

To customize views just create new theme. For example create avatar theme:

app/views/uploader/avatar/_container.html.erb
app/views/uploader/avatar/_download.html.erb
app/views/uploader/avatar/_upload.html.erb

And pass theme to input field:

= form.uploader_field :photo, theme: 'avatar'

Chunked file uploads

Chunked file uploads are only supported by browsers with support for XHR file uploads and the Blob API, which includes Google Chrome and Mozilla Firefox 4+.

To upload large files in smaller chunks, set the max_chunk_size option to a preferred maximum chunk size in Bytes:

= f.uploader_field :video, data: { max_chunk_size: 10_000_000 }

That's it!

Contributing

  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Added some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request

Copyright (c) 2016 Fodojo LLC, released under the MIT license

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