设计用户的rails pg db迁移未定义方法“database_authenticatable”

undefined method database_authenticatable' for #<ActiveRecord::ConnectionAdapters::PostgreSQLAdapter::TableDefinition:0xd715388>

迁移是：

class DeviseCreateUsers < ActiveRecord::Migration
  def self.up
    create_table(:users) do |t|
      t.database_authenticatable :null => false
      t.recoverable
      t.rememberable
      t.trackable
      t.timestamps
    end
    add_index :users, :email,                :unique => true
    add_index :users, :reset_password_token, :unique => true
  end
  def self.down
    drop_table :users
  end
end

如果我没记错的话，设计改变了它生成的迁移风格

create_table(:user) do |t|
  t.database_authenticatable
end

to

create_table(:user) do |t|
  ## Database authenticatable
  t.string :email,              :null => false, :default => ""
  t.string :encrypted_password, :null => false, :default => ""
end

2.0版本之后。

更新：看这个wiki https://github.com/plataformatec/devise/wiki/How-To%3a-Upgrade-to-Devise-2.0-migration-schema-style.