validates_presence_of :media (carrierwave) failing rails 4.0.4, rspec

[Deleted user]

After updating gems shoulda validates_presence_of is kicking out an error I can't figure out.

OS X 10.7.5
ruby -v ===> ruby 2.1.1p76 (2014-02-24 revision 45161) [x86_64-darwin11.0]
rails -v ===> Rails 4.0.4

bundle | grep rspec
Using rspec-core 2.13.1
Using rspec-expectations 2.13.0
Using rspec-mocks 2.13.1
Using rspec 2.13.0
Using guard-rspec 2.5.0
Using rspec-rails 2.13.1

bundle | grep shoulda
Using shoulda-context 1.2.1
Using shoulda-matchers 2.6.0
Using shoulda 3.5.0

bundle | grep carrier
Using carrierwave 0.10.0

model

  ...
  validates_presence_of :media, message: "You must specify an mp4 file to upload"
  ...

spec file

require 'spec_helper'
...
   it { should validate_presence_of(:media).with_message("You must specify an mp4 file to upload") }
...

rspec spec/models/video_spec.rb

  1) Video Validations 
     Failure/Error: it { should validate_presence_of(:media).with_message("You must specify an mp4 file to upload") }
     Shoulda::Matchers::ActiveModel::CouldNotClearAttribute:
       Expected value to be nil, but was <VideoUploader:0x007fc159dcbb68 @model= Video id: nil, title: nil, description: nil, enabled: true, course_id: nil, sortorder: 0, created_at: nil, updated_at: nil, media: nil, survey: nil, pub_date: nil, author: nil, @mounted_as=:media>
     ./spec/models/video_spec.rb:43:in block (3 levels) in top (required)

non shoulda validation works

    it "Should not allow Video with no media file" do
      bad_vid=FactoryGirl.build(:video,media: nil)
      expect(bad_vid).to be_invalid
    end

Above test results in green 'Should not allow video with no media file"

[dougfarre]

Its not just during testing. Calling a validates_presence_of a carrierwave attribute will fails because the attribute won't be set until the model has been saved. Read the following:

https://github.com/carrierwaveuploader/carrierwave/wiki/how-to:-validate-uploads-with-active-record

[mcmire]

Closing this due to lack of activity.