cache_only breaks validation on updates

[CodingAnarchy]

I have a class like this:

class Child < ActiveRecord::Base
    mount_uploader :image, ImageUploader
   
    validate :image, presence: true
end

In the specs, I have some various tests that validate cases where this model will be updated, but if I set config.cache_only = true in my configuration of CarrierWave in the test environment, this validation fails when the update occurs.

I would like to use this feature, so as not to have to copy all the files to a :file storage, but I can't until this problem is resolved. Thanks.

[mshibuya]

#2658 should have solved this.