mutiple upload with rails and paperclip - ruby-on-rails

Question

I am following this tutorial here to use multiple uploads with paperclip.
However when I add the files I get the flash notice confirming the gallery was added succesfully but there are no images uploaded. I am sure its the implementation in my controller.
gallery_controller.rb
def update
#gallery = Gallery.friendly.find params[:id]
respond_to do |format|
if #gallery.save
if params[:exhibition_images_attributes]
params[:exhibition_images_attributes].each { |image|
#gallery.exhibition_images.create(image: image)
}
end
format.html { redirect_to #gallery, notice: 'Gallery was successfully updated.' }
format.json { render :show, status: :ok, location: #gallery }
else
format.html { render :edit }
format.json { render json: #gallery.errors, status: :unprocessable_entity }
end
end
end
def edit
#gallery = Gallery.friendly.find params[:id]
#image = #gallery.exhibition_images.new
end
private
def gallery_params
params.require(:gallery).permit(:title, exhibition_images_attributes: [:image])
end
upload form
<%= bootstrap_form_for(#gallery, :html => {:multipart => true}, layout: :horizontal, label_col: "col-sm-2", control_col: "col-sm-10") do |f| %>
<%= f.text_field :title %>
<%= f.fields_for :exhibition_images do |f| %>
<%= f.file_field "image[]", type: :file, multiple: true %>
<% end %>
<%= f.submit "Create/Update", class: "btn btn-primary" %>
<% end %>
gallery.rb
class Gallery < ActiveRecord::Base
extend FriendlyId
friendly_id :title, use: :slugged
belongs_to :guide
has_many :exhibition_images, :autosave => true
accepts_nested_attributes_for :exhibition_images
end
exhibition_image.rb
class ExhibitionImage < ActiveRecord::Base
belongs_to :gallery, :autosave => true
has_attached_file :image, styles: { small: "100x100", guide: "500x500" }
validates_attachment_content_type :image, :content_type => ["image/jpg", "image/jpeg", "image/png", "image/gif"]
end