Rails - paperclip - NoMethodError - ruby-on-rails

Question

I'm trying to make a create product page in rails. This includes adding multiple images and text fields. I have one model for products and one for photos. I'm using the paperclip gem for photo upload. But I get this error when I try to create a new product. P.S. I use HAML.
NoMethodError in Products#new
Showing /some_app/app/views/products/new.html.haml where line #33 raised:
undefined method `photo' for :product:Symbol
Extracted source (around line #33):
33: = f.file_field :product.photo, multiple: 'multiple'
products/new.html.haml
%h1
create item
= form_for #product, :html => { :multipart => true } do |f|
- if #product.errors.any?
.error_messages
%h2 Form is invalid
%ul
- for message in #product.errors.full_messages
%li
= message
%p
= f.label :name
= f.text_field :name
%p
= f.file_field :product.photo, multiple: 'multiple'
%p.button
Products controller
class ProductsController < ApplicationController
def new
#product = Product.new
#photo = Photo.new
end
def create
#photo = current_user.photos.build(params[:photo])
5.times { #product.photos.build }
#product = current_user.products.build(params[:product])
if #product.save
render "show", :notice => "Sale created!"
else
render "new", :notice => "Somehting went wrong!"
end
end
Product model
class Product < ActiveRecord::Base
attr_accessible :description, :name, :price, :condition, :ship_method, :ship_price, :quantity, :photo
has_attached_file :photo
belongs_to :user
validates :user_id, presence: true
validates :name, presence: true, length: { minimum: 5 }
end
Photo model
class Photo < ActiveRecord::Base
attr_accessible :product_id
belongs_to :product
has_attached_file :image,
:styles => {
:thumb=> "100x100#",
:small => "300x300>",
:large => "600x600>"
}
end

Answer 1

The syntax isn't correct - change:
= f.file_field :product.photo, multiple: 'multiple'
To:
= f.file_field :photo, multiple: 'multiple'