пытаюсь использовать шаблон проектирования объекта формы, но получаю эту ошибку: ActiveModel :: UnknownAttributeError в PersonalTrainersController # create

Question

Я очень плохо знаком с рельсами, поэтому не знаю, что я делаю, но я пытаюсь использовать шаблон проектирования объектов формы. Я пытался отладить некоторое время и не могу понять это. Изменить: я добавил это в верхней части моего контроллера: требовать './ lib / assets / personal_trainer_from'. Теперь я получаю эту ошибку: ( неинициализированная константа PersonalTrainerForm :: Virtus ). Это форма, которую я пытаюсь использовать для базы данных

class PersonalTrainerForm
    include ActiveModel::Model
    include Virtus.model

    attribute :firstName, String
    attribute :secondName, String
    attribute :desription, String
    attribute :amountOfClients, Integer

    attr_reader :record

    def persist
        @personal_trainer = id ? PersonalTrainer.find(id) : PersonalTrainer.new
        if valid?
            @personal_trainer.save!
            true
        else
            false
        end
    end
end  

Это мой файл контроллера

require './lib/assets/personal_trainer_from'
class PersonalTrainersController < ApplicationController
  before_action :set_personal_trainer, only: [:show, :edit, :update, :destroy]

  # GET /personal_trainers
  # GET /personal_trainers.json
  def index
    @personal_trainers = PersonalTrainer.all

  end

  # GET /personal_trainers/1
  # GET /personal_trainers/1.json
  def show
    @personal_trainer_decorator = helpers.decorate(personal_trainer)

  end

  # GET /personal_trainers/new
  def new
    @personal_trainer = PersonalTrainer.new
  end

  # GET /personal_trainers/1/edit
  def edit
  end

  # POST /personal_trainers
  # POST /personal_trainers.json
  def create
    @personal_trainer = PersonalTrainerForm.new(personal_trainer_params)

    respond_to do |format|
      if @personal_trainer.save
        format.html { redirect_to @personal_trainer, notice: 'Personal trainer was successfully created.' }
        format.json { render :show, status: :created, location: @personal_trainer }
      else
        format.html { render :new }
        format.json { render json: @personal_trainer.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /personal_trainers/1
  # PATCH/PUT /personal_trainers/1.json
  def update
    respond_to do |format|
      if @personal_trainer.update(personal_trainer_params)
        format.html { redirect_to @personal_trainer, notice: 'Personal trainer was successfully updated.' }
        format.json { render :show, status: :ok, location: @personal_trainer }
      else
        format.html { render :edit }
        format.json { render json: @personal_trainer.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /personal_trainers/1
  # DELETE /personal_trainers/1.json
  def destroy
    @personal_trainer.destroy
    respond_to do |format|
      format.html { redirect_to personal_trainers_url, notice: 'Personal trainer was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_personal_trainer
      @personal_trainer = PersonalTrainer.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def personal_trainer_params
      params.require(:personal_trainer).permit(:firstName, :secondName, :desription, :amountOfClients)
    end
end

И, наконец, это полный след.

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