Draper::UninferrableDecoratorError while decorating Delayed::Job

[MrShemek]

I just tried to decorate Delayed::Job but unfortunately it does not work.

My environment:

• Rails 5.0.0.1
• draper 3.0.0.pre1
• delayed_job 4.1.2
• delayed_job_active_record 4.1.1

My code:

decorators/delayed/job_decorator.rb

class Delayed::JobDecorator < Draper::Decorator
  delegate_all

  def status
    'queued'
  end

end

Admin::DiagnosticsController#index

@mailer_service = Delayed::Job.where("handler LIKE :service", service: '%SendClientSummaryJob%').first.decorate

The error:

Draper::UninferrableDecoratorError in Admin::DiagnosticsController#index
Could not infer a decorator for ActiveRecord::Base.

[seanlinsley]

It may just be the nested namespace that's causing the issue. Can you reproduce with simple Ruby classes?

[toppa]

I've run into the same issue trying to use Draper with the audited gem. The audits can be accessed as, e.g. Audited::Audit.new. I've tried a variety of syntax in a decorator for it, but get this same error (and Unable to autoload constant AuditDecorator with some of the syntax I've tried).

Is there a recommended syntax for defining a Draper decorator for use with a namespaced class?