==  DeviseCreateUsers: migrating ==============================================
-- create_table(:users)
rake aborted!
An error has occurred,this and all later migrations canceled:

undefined method `database_authenticatable' for #<ActiveRecord::ConnectionAdapters::TableDefinition:0x00000103fa1ff0>

Tasks: TOP => db:migrate
(See full trace by running task with --trace)

我使用–trace函数运行完整的跟踪,但似乎无法弄清楚问题是什么.
这是迁移文件：

class DeviseCreateUsers < ActiveRecord::Migration
def self.up
create_table(:users) do |t|
  t.database_authenticatable :null => false
  t.recoverable
  t.rememberable
  t.trackable
  t.confirmable

  # t.encryptable
  # t.lockable :lock_strategy => :Failed_attempts,:unlock_strategy => :both
  # t.token_authenticatable


  t.timestamps
 end

add_index :users,:email,:unique => true
add_index :users,:reset_password_token,:confirmation_token,:unique => true
# add_index :users,:unlock_token,:authentication_token,:unique => true
end

def self.down
  drop_table :users
  end
end