问未定义局部变量或方法`permitted_task_attributes‘用于#<Api::V1::TasksController

EN

module Api
  module V1
    class TasksController < ApiController
      def index
        task = Task.all
        render json: task
      end

      def create
        task = Task.create!(create_action_params)
        if task
          render json: task
        else
          render json: task.errors
        end
      end

      private

      def create_action_params
        params.require(:task).permit(permitted_task_attributes) # The problem is with this variable `permitted_task_attributes`
      end
    end
  end
end

class ApiController < ApplicationController
  before_action :set_api_request

  private

  def set_api_request
    request.format = request.format == :xml ? :xml : :json
  end
end

module ControllerHelpers
  module StrongParameters
    def permitted_attributes
      PermittedAttributes
    end

    delegate(*PermittedAttributes::ATTRIBUTES,
             to: :permitted_attributes,
             prefix: :permitted)

    def permitted_task_attributes
      permitted_attributes.task_attributes
    end
  end
end

module PermittedAttributes
  ATTRIBUTES = [
    :task_attributes
  ].freeze

  mattr_reader(*ATTRIBUTES)

  @@task_attributes = [
    :avatar_url, :description, :recorded_on
  ]
end

undefined local variable or method `permitted_task_attributes’ for #<Api::V1::TasksController:0x0000000000b7c0>