ActiveRecord model keeps dirty after update

[ssugiyama]

class FooUploader < CarrierWave::Uploader::Base
  def filename
    'a.png'
  end
end

class Foo < ApplicationRecord
  mount_uploader :image, FooUploader
end

foo = Foo.create!(...)
foo.update!(image: File.open(...))
puts foo.changed? # expecting 'false' but we get 'true'

this problem occurs since 3.0.0.rc to 3.0.3
only if filename method is defined in uploader
and saved outside transactions (if saved inside transactions, we get 'false')

Are there any workarounds or required settings?

[rajyan]

Is this issue related to your problem?
#2682

[ssugiyama]

Is this issue related to your problem?

Maybe, not. We tried changing filename in every save, but the problem was reproduced.

class FooUploader < CarrierWave::Uploader::Base
  def filename
    (Time.now.to_f * 1000).to_s + '.png'
  end
end

Here is additional information.

foo = Foo.create!(image: File.open('oldfile.png'))
foo.update!(image: File.open('newfile.png'))
puts foo.changes
=> {"image"=>["1694578531581.793.png", "newfile.png"]}

[rajyan]

Thank you for the detailed information!
I think #2707 fixes this bug.