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class PhotosController < ApplicationController
# truncated for brevity.
  def create
    params[:images].each{ |image|
      @photo = Photo.create(image: image)
      if @photo.save
        respond_to do |format|
          format.html { render json: @photo.to_jq_upload, content_type: 'text/html', layout: false }
          format.json { render json: @photo.to_jq_upload }
        end
      else
        render json: { error: @photo.errors.full_messages }, status: 304
      end
    }
  end
end

class Photo < ActiveRecord::Base
  #photo belongs to album
  belongs_to :album
  #validations
  validates :album, presence: true
  # Photo uploader using carrierwave
  mount_uploader :image, PhotoUploader
  
  def to_jq_upload
    {
      "url" => image.medium.url,
      "delete_url" => id,
      "picture_id" => id,
      "delete_type" => "DELETE"
    }.to_json
  end
end

$(function(){
  var ids = [];
  $('#album_upload').fileupload({
    done: function (e, data) {
      ids.push(data.result.picture_id);
      $('#photos_ids').val(ids);
    }
  });
});

class AlbumsController < ApplicationController
# truncated for brevity.
  def create
    @album = current_user.albums.build(album_params)
    @album.photos << Photo.find(params[:photos].split(","))
    authorize @album
    if @album.save
      flash[:notice] = "Your album has been created."
      redirect_to @album
    else 
      flash[:alert] = "Something went wrong."
      render :new
    end
  end
  
  def album_params
    params.require(:album).permit(:title, :description, :photos_attributes => [:album_id, :image])
  end
end

class Album < ActiveRecord::Base
  # belongs to user model
  belongs_to :user
  # Album has many photos
  has_many :photos, :inverse_of => :album, :dependent => :destroy
  # enable nested attributes for photos through album class
  accepts_nested_attributes_for :photos, allow_destroy: true
end

<input id="photos_ids" name="photos" type="hidden" value="">
<input data-url="/photos" id="album_upload" multiple="multiple" name="images[]" type="file" ></input>

This gist is the update of this post https://u.osu.edu/hasnan.1/2014/03/30/rails-4-multiple-file-upload-with-carrierwave-nested-form-and-jquery-file-upload/

License MIT