gistfile1.rb

# add column to article model
class AddActiveToArticles< ActiveRecord::Migration
  def change
    add_column :articles, :active, :boolean
  end
end

# now we need to modify our destroy method on our ArticleController
class ArticlesController < ApplicationController
  def destroy
    article = Article.find(params[:id])
    article.update_attribute(:active, false)
    redirect_to articles_path
  end
end

# We now need a scope so that we are only getting active articles
class Article < ActiveRecord::Base
  scope active, -> { where(active: true) }
end

# We now modify our index method in the ArticleController
def index
  @articles = Article.active
end