fix: Add slug to articles (#5500)

db/migrate/20220926164441_add_slug_to_article.rb

@@ -0,0 +1,21 @@
+class AddSlugToArticle < ActiveRecord::Migration[6.1]
+  def up
+    add_column :articles, :slug, :string
+
+    update_past_articles_with_slug
+
+    add_index :articles, :slug
+    change_column_null(:articles, :slug, false)
+  end
+
+  def down
+    remove_column(:articles, :slug)
+  end
+
+  def update_past_articles_with_slug
+    Article.all.each_with_index do |article, index|
+      slug = article.title.underscore.parameterize(separator: '-')
+      article.update!(slug: "#{slug}-#{index}")
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2022_09_20_014549) do
+ActiveRecord::Schema.define(version: 2022_09_26_164441) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_stat_statements"
@@ -131,8 +131,10 @@ ActiveRecord::Schema.define(version: 2022_09_20_014549) do
     t.bigint "author_id"
     t.bigint "associated_article_id"
     t.jsonb "meta", default: {}
+    t.string "slug", null: false
     t.index ["associated_article_id"], name: "index_articles_on_associated_article_id"
     t.index ["author_id"], name: "index_articles_on_author_id"
+    t.index ["slug"], name: "index_articles_on_slug"
   end
 
   create_table "attachments", id: :serial, force: :cascade do |t|