Dirty tracking on Rails 4.2 with remote_foo_url considers upload field changed even when unchanged, messing with PaperTrail

[henrik]

I've got a Company with a mounted logo.

Changing just the company name is dirty-tracked as expected:

c.name = "Bar"
c.changed_attributes
# => {"name"=>"Foo"}

But I've got a form with direct-to-S3-uploads that will then post a hidden-field remote_logo_url when submitted. If I just edit the name via the form and leave the remote_logo_url hidden-field empty, this happens:

c.name = "Bar"
c.remote_logo_url = ""
c.changed_attributes
# => {"name"=>"Foo", "logo"=> #<CompanyLogoUploader:0x00005604560dbac8 …

This in turn means that PaperTrail will track the logo as changed every time the form is used, even if the logo is left unchanged.

I have not checked if this is also the case on later versions of Rails, or if you're not using the remote_foo_url functionality.

[henrik]

After upgrading to Rails 5.1 it seems this issue went away.

EDIT: Spoke too soon. It did not.

[henrik]

@mshibuya Oh, did not expect this to suddenly get adressed. Thanks for that :)