module SubjectableController
  extend ActiveSupport::Concern

  included do
    before_action :authenticate_user!, only: [:subjecting, :unsubjecting]
  end

    # POST /v1/learning_objects/1/subjects
    # POST /v1/learning_objects/1/subjects.json
    def subjecting
      subjectable.add_subjects(ids: params[:subjects])
      render json: subjectable.subjects, status: :created
    end

    # DELETE /v1/learning_objects/1/subjects
    # DELETE /v1/learning_objects/1/subjects.json
    def unsubjecting
      subjectable.remove_subjects(ids: params[:subjects])
      render json: subjectable.subjects, status: :ok
    end

    protected

    def subjectable
      raise NotImplementedError
    end

end