configures act_as_commentable_with_threading gem [#7]

db/migrate/20150718091702_acts_as_commentable_with_threading_migration.rb

@@ -0,0 +1,21 @@
+class ActsAsCommentableWithThreadingMigration < ActiveRecord::Migration
+  def self.up
+    create_table :comments, :force => true do |t|
+      t.integer :commentable_id
+      t.string :commentable_type
+      t.string :title
+      t.text :body
+      t.string :subject
+      t.integer :user_id, :null => false
+      t.integer :parent_id, :lft, :rgt
+      t.timestamps
+    end
+
+    add_index :comments, :user_id
+    add_index :comments, [:commentable_id, :commentable_type]
+  end
+
+  def self.down
+    drop_table :comments
+  end
+end