FEATURE: First Link badge

db/migrate/20140710005023_add_badge_posts_and_topics_view.rb

@@ -0,0 +1,20 @@
+class AddBadgePostsAndTopicsView < ActiveRecord::Migration
+  def up
+    add_column :categories, :allow_badges, :boolean, default: true, null: false
+
+    execute "CREATE VIEW badge_posts AS
+    SELECT p.*
+    FROM posts p
+    JOIN topics t ON t.id = p.topic_id
+    JOIN categories c ON c.id = t.category_id
+    WHERE c.allow_badges AND
+          p.deleted_at IS NULL AND
+          t.deleted_at IS NULL AND
+          t.visible"
+  end
+
+  def down
+    execute "DROP VIEW badge_posts"
+    remove_column :categories, :allow_badges
+  end
+end