How do I sync errors back to the model?

[NullVoxPopuli]

Complete Description of Issue

I'm trying to render jsonapi formatted errors, via

    def create
      model = resource_proxy.new(create_params)
      form = RegistrationForms::Create.new(model)
      valid = form.validate(create_params)
      form.sync

      if valid && model.save
        render jsonapi: model, status: :created
      else
        render jsonapi: model.errors, status: :unprocessable_entity
      end
    end

I can get form.errors, but it's not the right type of object for the jsonapi renderer to pick up -- which may be an issue I need to take up with active_model_serializers.... but.. not right now.

Is there a built-in way I can sync the errors back to the model?

I suppose I could make some method that

from.errors.each do |field, errors|
  errors.each do |error|
    model.errors.add(field, error)
  end
end

But, am wondering about a built-in way. thanks!

System configuration

Reform version: 2.2.4

[NullVoxPopuli]

This is how I did the sync:

in my api_controller.rb:

  def sync_form_and_model(form, model)
    form.sync

    form_errors = form.errors.messages
    return if form_errors.blank?

    form_errors.each do |field, errors|
      Array[*errors].each do |error|
        model.errors.add(field, error)
      end
    end
  end

I noticed that in master, this api doesn't work. I hope there is something similar for the next release for getting the raw errors hash.

[apotonick]

What method is missing when using master, I wonder? The Errors API from ActiveRecord is kinda fuzzy and changes every now and then, so your input is valuable here! ✨

[emaglio]

@apotonick should we have this as a new feature in the 3.x version?

[dmitry]

With new rails 6.1 it will be much easier: https://code.lulalala.com/2020/0531-1013.html