Rails 4 с драгоценным камнем Pundit & Statesman - политика, когда объект находится в состоянии

Я пытаюсь сделать приложение в Rails 4.

Я пытаюсь использовать stateman gem для состояний, а затем pundit для политик.

В моем gemfile есть:

gem 'statesman', '~> 1.3', '>= 1.3.1'
gem 'pundit'

У меня есть модель статьи и модель переходов статей и модель article_state_machine.

Моя цель - определить политику публикации (используя pundit) в моей политике статей, которая позволяет пользователю, которому принадлежит статья, публиковать эту статью, если она находится в состоянии "одобрено".

Я пытаюсь это в моей политике статьи pundit:

class ArticlePolicy < ApplicationPolicy

def publish?

user.present? && user == article.user 
# if requires approval, then approved

# and article.in_state(:approve) - why doesnt this work - see statesman docs? 

 # user && user.article.exists?(article.id)

 end
end

Когда я пытаюсь проверить, находится ли статья в состоянии: утвердить (как указано выше), появляется сообщение об ошибке, которое говорит undefined method 'in_state'.

Как я могу использовать конечный автомат в политике? Или она предназначена для того, чтобы политика позволяла пользователю публиковать все время, но вы показываете только кнопку на странице показа статьи, когда статья находится в состоянии одобрить (хотя я думал, что это была точка pundit).

Article.rb

class Article < ActiveRecord::Base
  include Statesman::Adapters::ActiveRecordQueries
has_many :transitions, class_name: "ArticleTransition", autosave: false  
def state_machine
    @state_machine ||= ArticleStateMachine.new(self, transition_class: ArticleTransition, association_name: :transitions)
  end

  # delegate :can_transition_to?. :trans

  # def reindex_articles
  #   article.reindex_async
  # end

  private

  def self.transition_name
    :transitions
  end

  def self.transition_class
    ArticleTransition
  end

  def self.initial_state
    # ArticleTransition.initial_state
    :draft
  end
end

Модель конечного автомата статьи:

class ArticleStateMachine
    include Statesman::Machine

  state :draft, initial: :true #while author is drafting
  state :review #while approver comments are being addressed (really still in draft)
  state :reject # not suitable for publication
  state :approve # suitable for publication
  state :publish #published
  state :remove #  destroyed
  # state :spotlight

  transition from: :draft, to: [:reject, :approve, :publish, :remove]
  # transition from: :review, to: [:rejected, :approved, :removed]
  transition from: :reject, to: [:draft, :remove]
  transition from: :approve, to: [:publish, :remove]
  transition from: :publish, to: :remove

end

Модель перехода статьи:

class ArticleTransition < ActiveRecord::Base
  include Statesman::Adapters::ActiveRecordTransition


  belongs_to :article, inverse_of: :article_transitions



end

Контроллер статьи:

  def approve
    article = Article.find(params[:id])
    if article.state_machine.transition_to!(:approve)
      flash[:notice] = "This article has been approved for publication"
      redirect_to action: :show, id: article_id
      # add mailer to send message to article owner that article has been approved
    else
      flash[:error] = "You're not able to approve this article"
      redirect_to action: :show, id: article_id
    end
  end

def publish
    article = Article.find(params[:id])
    authorize @article

    if article.state_machine.transition_to!(:publish)
      redirect_to action: :show, id: article_id
      # how do you catch the date the state became published?
    else
      flash[:error] = "You're not able to publish this article"
      redirect_to action: :show, id: article_id
    end
  end

Может ли кто-нибудь увидеть, что я сделал неправильно?

Весь контроллер товаров имеет:

class ArticlesController < ApplicationController
  before_action :set_article, only: [:show, :edit, :update, :destroy, :reject, :approve, :publish, :remove]
  before_action :authenticate_user!, except: [:index, :show, :search, :reject, :approve, :publish, :remove]


  respond_to :html, :json
# GET /articles
  # GET /articles.json
  def index
    @articles = policy_scope(Article)
    # query = params[:query].presence || "*"
    # @articles = Article.search(query)
  end

  # def index
  #   if params[:query].present?
  #     @books = Book.search(params[:query], page: params[:page])
  #   else
  #     @books = Book.all.page params[:page]
  #   end
  # end

  # GET /articles/1
  # GET /articles/1.json
  def show

  end

  # GET /articles/new
  def new
    @article = Article.new
    @article.comments.build
  end

  # GET /articles/1/edit
  def edit

    authorize @article
  end

  # POST /articles
  # POST /articles.json
  def create
    # before_action :authenticate_user!
    # authorize @article
    @article = current_user.articles.new(article_params)

    respond_to do |format|
      if @article.save
        format.html { redirect_to(@article) }
        format.json { render :show, status: :created, location: @article }
      else
        format.html { render :new }
        format.json { render json: @article.errors, status: :unprocessable_entity }
      end
    end
  end

  def search
    if params[:search].present?
      @articless = Article.search(params[:search])
    else 
      @articles = Articles.all
    end
  end


  # PATCH/PUT /articles/1
  # PATCH/PUT /articles/1.json
  def update
    # before_action :authenticate_user!
    authorize @article
    respond_to do |format|
    #   if @article.update(article_params)
    #     format.json { render :show, status: :ok, location: @article }
    #   else
    #     format.html { render :edit }
    #     format.json { render json: @article.errors, status: :unprocessable_entity }
    #   end
    # end
      if @article.update(article_params)
         format.html { redirect_to(@article) }
        format.json { render :show, status: :ok, location: @article }
      else
        format.json { render json: @article.errors, status:      :unprocessable_entity }
      end
      format.html { render :edit }
    end
  end



  # DELETE /articles/1
  # DELETE /articles/1.json
  def destroy
    before_action :authenticate_user!
    authorize @article
    @article.destroy
    respond_to do |format|
      format.json { head :no_content }
    end
  end

  # def review
  #   article = Article.find(params[:id])
  #   if article.state_machine.transition_to!(:review)
  #     flash[:notice] = "Comments on this article have been made for your review"
  #     redirect_to action: :show, id: article_id
  #   else
  #     flash[:error] = "You're not able to review this article"
  #     redirect_to action: :show, id: article_id
  #   end
  # end

  def reject
  end

  def approve
    article = Article.find(params[:id])
    if article.state_machine.transition_to!(:approve)
      flash[:notice] = "This article has been approved for publication"
      redirect_to action: :show, id: article_id
      # add mailer to send message to article owner that article has been approved
    else
      flash[:error] = "You're not able to approve this article"
      redirect_to action: :show, id: article_id
    end
  end

  def publish
    article = Article.find(params[:id])
    if article.state_machine.transition_to!(:publish)
      redirect_to action: :show, id: article_id
      # how do you catch the date the state became published?
    else
      flash[:error] = "You're not able to publish this article"
      redirect_to action: :show, id: article_id
    end
  end

  def remove
    article = Article.find(params[:id])
    if article.state_machine.transition_to!(:remove)
      redirect_to root_path
    else
      flash[:error] = "You're not able to destroy this article"
      redirect_to action: :show, id: article_id
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_article
      @article = Article.find(params[:id])
      authorize @article
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def article_params
      params.require(:article).permit(:body, :title, :image, :tag_list,
        comment_attributes: [:opinion])
    end

end