state sample

state_sample.rb

# app/models/article.rb
class Article < ApplicationRecord
  has_many :article_publications

  scope :draft, -> { left_joins(:article_publications).where(article_publications: { id: nil }) }
  scope :published, -> { joins(:article_publications) }
end

# app/models/article_publication.rb
class ArticlePublication < ApplicationRecord
  belongs_to :article
end

# app/controllers/article_publications_controller.rb
class ArticlePublicationsController < ApplicationController
  def create
    @article = Article.find(params[:article_id])
    @article_publication = ArticlePublication.new(article: @article)
    
    if @article_publication.save
      redirect_to article_path(@article), notice: "公開したよ"
    else
      render :new
    end
  end
end