class CreateActiveAdminComments

def self.down
  drop_table :active_admin_comments
end

def self.up
  create_table :active_admin_comments do |t|
    t.string :namespace
    t.text   :body
    t.string :resource_id,   :null => false
    t.string :resource_type, :null => false 
    t.references :author, :polymorphic => true
    t.timestamps
  end
  add_index :active_admin_comments, [:namespace]
  add_index :active_admin_comments, [:author_type, :author_id]
  add_index :active_admin_comments, [:resource_type, :resource_id]
end