Can not save the clip image on the rails on Windows 8

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I use "paperclip", "~> 4.1" (on windows 8) to save picture to my product. I have below code:

products_controller:

class ProductsController < ApplicationController
  before_action :set_product, only: [:show, :edit, :update, :destroy]
  def index
    @products = Product.all
  end

  def show
  end

  def new
    @product = Product.new
  end
  def edit
    @product = Product.all
  end
  def create
    @product = Product.new(product_params)
    respond_to do |format|
      if @product.save
        format.html { redirect_to @product, notice: 'Product was successfully created.' }
        format.json { render action: 'show', status: :created, location: @product }
      else
        format.html {
          render action: 'new'
        }
        format.json { render json: @product.errors, status: :unprocessable_entity }
      end
    end
  end

  def update
    respond_to do |format|
      if @product.update(product_params)
        format.html { redirect_to @product, notice: 'Product was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: 'edit' }
        format.json { render json: @product.errors, status: :unprocessable_entity }
      end
    end
  end

  def destroy
    @product.destroy
    respond_to do |format|
      format.html { redirect_to products_url }
      format.json { head :no_content }
    end
  end

  private

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

    def product_params
      params.require(:product).permit(:name, :code,:picture)
    end
end

product.rb

class Product < ActiveRecord::Base
  has_attached_file :picture, :styles => { :medium => "300x300>", :thumb => "100x100>" }, :default_url => "/images/missing.png"
  validates_attachment_content_type :picture, :content_type => [ 'image/gif', 'image/png', 'image/x-png', 'image/jpeg', 'image/pjpeg', 'image/jpg' ]

end

but when I want save the picture that I upload, I get below error:

1 error prohibited this product from being saved:
Picture has an extension that does not match its contents

Log of system:

Started POST "/products" for 127.0.0.1 at 2014-05-04 23:23:31 +0430
Processing by ProductsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"XVKgrUjhmB6auJXM5zTrDFrw7GLS0jdUPFelXt4se4Y=", "product"=>{"name"=>"Product 453", "code"=>"324324", "category_id"=>"10", "describe"=>"", "picture"=>#<ActionDispatch::Http::UploadedFile:0x00000004fdb750 @tempfile=#<Tempfile:C:/Users/MGH~1.119/AppData/Local/Temp/RackMultipart20140504-5856-p42svx>, @original_filename="pic.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"product[picture]\"; filename=\"pic.jpg\"\r\nContent-Type: image/jpeg\r\n">}, "commit"=>"Save change"}
  User Load (1.0ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 17 ORDER BY "users"."id" ASC LIMIT 1
Command :: file -b --mime-type "C:/Users/MGH~1.119/AppData/Local/Temp/be0933fb4765581454c720c6cac4755920140504-5856-15ak6qf"
[paperclip] Content Type Spoof: Filename pic.jpg (["image/jpeg"]), content type discovered from file command: . See documentation to allow this combination.
  Responsibility Load (0.0ms)  SELECT "responsibilities".* FROM "responsibilities" WHERE "responsibilities"."user_id" = ? ORDER BY "responsibilities"."id" ASC LIMIT 1  [["user_id", 17]]
   (1.0ms)  begin transaction
Command :: file -b --mime-type "C:/Users/MGH~1.119/AppData/Local/Temp/6db10b0624aa4c70237ca9e622c03f4620140504-5856-t1i2gw"
[paperclip] Content Type Spoof: Filename pic.jpg (["image/jpeg"]), content type discovered from file command: . See documentation to allow this combination.
   (0.0ms)  rollback transaction
  Category Load (0.0ms)  SELECT "categories".* FROM "categories"
  Rendered products/_form.html.erb (2.0ms)
  Rendered products/new.html.erb within layouts/product (3.0ms)
  Rendered layouts/_header.html.erb (0.0ms)
  Rendered layouts/_sidebar.erb (0.0ms)
Completed 200 OK in 159ms (Views: 16.0ms | ActiveRecord: 2.0ms)

Where is the problem?

And how can I save pdf file to paperclip and show it in view?


Paperclip introduced spoofing validation at v4.0 to ensure that the contents of the file match the extension.

It uses the file command to determine the MIME type of the file which is fine if you use linux or OS X. Unfortunately Windows doesn't have a file command so it comes back with blank - since this doesn't match the expected MIME type of the file according to its extension you get the spoofing error.

This little bit from your log:

content type discovered from file command: .

The bit between the colon and the full stop is the output from the file command; which on Windows is always going to be blank.

The best workaround I know for Windows is to disable spoofing. For this you need to put something like this in an initializer:

module Paperclip
  class MediaTypeSpoofDetector
    def spoofed?
      false
    end
  end
end