Hi There,

On the mission to find a ash friendly way to add versioning to my project. I found ash-paper-trail.
My requirements were:

• postgres compatible
• no additional database extensions
• testing friendly (no workaround to run tests)
• support to add versioning to single resources instead of all tables
• option to only store the attributes which changed

after browsing a bit through the forum I found this post which gave me a great idea of whats possible and I started using ash-paper-trail because it ticks all the boxes.

After setting up things and migrating the database, I faced errors while executing my tests:

** (Ash.Error.Invalid) Input Invalid

     * Invalid value provided for version_source_id: got invalid prefixed term.

     "rec_02vbruyKluKnzDyCkFExo8"
     
     code: assert {:ok, %Record{} = _record} = Record.create(attrs)
     stacktrace:
       (ash 2.18.2) lib/ash/api/api.ex:2711: Ash.Api.unwrap_or_raise!/3
       (ash_paper_trail 0.1.0) lib/resource/changes/create_new_version.ex:93: AshPaperTrail.Resource.Changes.CreateNewVersion.build_notifications/2
       (ash_paper_trail 0.1.0) lib/resource/changes/create_new_version.ex:22: anonymous fn/2 in AshPaperTrail.Resource.Changes.CreateNewVersion.create_new_version/1
...

then I checked my resource definition:

...
  use Ash.Resource,
    data_layer: AshPostgres.DataLayer,
    extensions: [
      AshUUID,
      AshPaperTrail.Resource
    ]
...
  attributes do
    uuid_attribute :id, prefix: "rec"
    attribute :name, :string
    attribute :description, :string
    timestamps private?: false, writable?: false
  end

  paper_trail do
    change_tracking_mode :changes_only
    store_action_name? true
    ignore_attributes [:inserted_at, :updated_at]
  end
...

And I was wondering if the use of AshUUID and the prefixed primary key definition leads to the fact that I can’t use ash-paper-trail at all or if I missed the one hint to make it work in this case?
It would be really a shame if it would not work, because it’s such a smooth and nice integration compared to other solutions.

All the Best