Draper::UninferrableDecoratorError (Could not infer a decorator)-CodePudding

I want to infer a decorator in a controller, so I generate a decorator the normal way (rails g decorator) and infer it in the controller. However, when I test with Postman, I get the error:

Could not infer a decorator for Employers::Job.

The error message shows that my syntax in the controller is incorrect (where .decorate is used), I don't know where I am going wrong.

I have tried changing the way of writing and specifying the decorator explicitly ( @job = Api::V2::Employers::JobDecorator.find(params[:id]).decorate), but again this gives a NoMethodError (undefined method `find' for Api::V2::Employers::JobDecorator:Class).

This is part of the controller:

class Api::V2::Employers::JobsController < Api::V2::Employers::BaseController

  before_action :get_job, except: [:index, :create, :renew]
  before_action :get_tags, only: [:create, :update]
  before_action :get_address, only: :update

  def show
    @job = @employer.jobs.find(params[:id]).decorate
    render json: @job
  end
end

This is the decorator at the beginning:

 class Api::V2::Employers::JobDecorator < Draper::Decorator
  delegate_all
  decorates_association :employer

  def attributes
    #somethings
  end

end

UPDATE 2 Thanks to the suggestion in the comments, things changed after I used Api::V2::Employers::JobDecorator.decorate(@job) in the controller, but I got a new error. The message says undefined method 'attributes' for nil:NilClass, the source is a line of code from the following file:

#app/decorators/api/v2/employers/job_decorator.rb

class Api::V2::Employers::JobDecorator < Draper::Decorator
  delegate_all
  decorates_association :employer

  def attributes
    super.merge(
      {
        id: nil, 
        employer: nil, 
      }).delete_if { |k, v| 
          ['class_name'].include?(k)
        }
  end

end

What is the reason for this?

CodePudding user response：

Draper infers the decorator from the object that is decorated and in your scenario is Employers::Job.

Because the decorator you want to be used has a totally different name, Api::V2::Employers::JobDecorator, you need to explicitly specify it.

So, Api::V2::Employers::JobDecorator.decorate(@job) is what you need.

More information, here