Can't upload image using Paperclip 4.0 Rails 3

Question

I've installed ImageMagick and I've installed the gem Paperclip (version 4.0). I've added:

Paperclip.options[:command_path] = 'C:\Program Files\ImageMagick-6.8.8-Q16'

to the development.rb

My photo.rb Model has this:

has_attached_file :image
validates_attachment_content_type :image, :content_type => ['image/jpeg', 'image/png', 'image/jpg']

I can choose a file in photos/new.html.erb but once I click on 'Create photo' button, the page reloads with a Paperclip specific error message saying:

1 error prohibited this photo from being saved:
Image translation missing: 
en.activerecord.errors.models.photo.attributes.image.spoofed_media_type

Can someone help please? Thanks

Answer 1

Add this to an initializer to disable spoofing protection:

require 'paperclip/media_type_spoof_detector'
module Paperclip
  class MediaTypeSpoofDetector
    def spoofed?
      false
    end
  end
end

Answer 2

That message is raised by a validation check for content spoofing.

For Paperclip v.4 this generates a bug https://github.com/thoughtbot/paperclip/issues/1429

While for Paperclip v.3, it seems it just throws a deprecation warning, https://github.com/thoughtbot/paperclip/issues/1423

So I'd wait for Paperclip team to solve this bug before using version 4. At the moment I'd rather keep using version 3.

gem "paperclip", "~> 3.5.3"