Ruby on rails - paperclip not saving to database

Question

I'm trying to make a create product page in rails. This includes adding multiple images. I have one model for products one for photos and for users. I'm using the paperclip gem for photo upload. But I have 2 problems.

1. My file input is not allowing me to select multiple images
2. When I view a product no pictures show because pictures are not being saved to database

P.S. I use HAML and I dont have a photo controller.

Products controller

class ProductsController < ApplicationController
    before_filter :current_user, only: [:create, :destory]
    before_filter :correct_user, only: :destory

  def new 
@product = Product.new
    @photo = Photo.new
    5.times { @product.photos.build }
  end

  def create

  @photo = current_user.photos.build(params[:photo])

  @product = current_user.products.build(params[:product])
    if @product.save
        render "show", :notice => "Sale created!"
    else
        render "new", :notice => "Somehting went wrong!"
    end
end

def show
@product = Product.find(params[:id]) 
end

create product page

= 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
    = fields_for :photos do |f_i|
      =f_i.file_field :image 

  %p.button
    = f.submit

product model

class Product < ActiveRecord::Base
  attr_accessible :description, :name, :price, :condition, :ship_method, :ship_price, :quantity, :photo
  has_many :photos, dependent: :destroy
  accepts_nested_attributes_for :photos
  belongs_to :user

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

User Model

class User < ActiveRecord::Base
  attr_accessible :email, :password, :password_confirmation, :name

  attr_accessor :password
  has_many :products, dependent: :destroy
  has_many :photos,:through=>:products

show product page

  %b seller
  = @product.user.name
  %br 
  - @product.photos.each do |photo|
    = image_tag photo.image.url

Answer 1

your User model not attached to photos so photos only are belongs to Product model so you need to change your User model to be

 class User < ActiveRecord::Base
  has_many :products
  has_many :photos,:through=>:products


  end

then you can fetch User photos through

 @photos =current_user.photos 

or you can build a photo easily

@photo = current_user.photos.build(params[:photo])

also in your views you need to do instead of = f.file_field :photo, multiple: 'multiple'

use

= fields_for :photos do |f_i|
    =f_i.file_field :image

try it .

these is the simple way for has many through association

   class Document < ActiveRecord::Base
  has_many :sections
  has_many :paragraphs, :through => :sections
  end

 class Section < ActiveRecord::Base
 belongs_to :document
  has_many :paragraphs
end

class Paragraph < ActiveRecord::Base
 belongs_to :section
 end

you can check these guide for more info

http://guides.rubyonrails.org/association_basics.html also you need to put

 accepts_nested_attributes_for :photos

inside your Product model

for a complete tutorial about nested forms you can watch these screen cast

http://railscasts.com/episodes/196-nested-model-form-revised

its not free

you can watch these free screen cast if your not subscribed to railscasts.com

http://railscasts.com/episodes/196-nested-model-form-part-1

http://railscasts.com/episodes/197-nested-model-form-part-2