title: undefined method `database_authenticatable' for #<ActiveRecord::ConnectionAdapters::TableDefinition:0x9dee690>
body: <p>I am using Active Admin gem for my small application based on Quiz. But when I execute <strong>rake db:migrate</strong> it gives me error. Following is the trace of the command :</p>
  
  <pre><code>$ rake db:migrate RAILS_ENV=production --trace
  ** Invoke db:migrate (first_time)
  ** Invoke environment (first_time)
  ** Execute environment
  ** Invoke db:load_config (first_time)
  ** Invoke rails_env (first_time)
  ** Execute rails_env
  ** Execute db:load_config
  ** Execute db:migrate
  ==  DeviseCreateAdminUsers: migrating =========================================
  -- create_table(:admin_users)
  rake aborted!
  An error has occurred, all later migrations canceled:
  
  undefined method `database_authenticatable' for #&lt;ActiveRecord::ConnectionAdapters::TableDefinition:0x9dee690&gt;
  /home/users/Documents/Quiz/db/migrate/20120509055635_devise_create_admin_users.rb:4:in `block in change'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/connection_adapters/abstract/schema_statements.rb:160:in `create_table'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/connection_adapters  /abstract_mysql_adapter.rb:432:in `create_table'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/migration.rb:466:in `block in method_missing'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/migration.rb:438:in `block in say_with_time'
  /home/users/.rvm/rubies/ruby-1.9.2-p318/lib/ruby/1.9.1/benchmark.rb:295:in `measure'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/migration.rb:438:in `say_with_time'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/migration.rb:458:in `method_missing'
  /home/users/Documents/Quiz/db/migrate/20120509055635_devise_create_admin_users.rb:3:in `change'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/migration.rb:407:in `block (2 levels) in migrate'
  /home/users/.rvm/rubies/ruby-1.9.2-p318/lib/ruby/1.9.1/benchmark.rb:295:in `measure'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/migration.rb:407:in `block in migrate'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:119:in `with_connection'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/migration.rb:389:in `migrate'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/migration.rb:528:in `migrate'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/migration.rb:720:in `block (2 levels) in migrate'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/migration.rb:777:in `call'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/migration.rb:777:in `ddl_transaction'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/migration.rb:719:in `block in migrate'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/migration.rb:700:in `each'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/migration.rb:700:in `migrate'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/migration.rb:570:in `up'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/migration.rb:551:in `migrate'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.3/lib/active_record/railties/databases.rake:153:in `block (2 levels) in &lt;top (required)&gt;'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `call'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `block in execute'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
  /home/users/.rvm/rubies/ruby-1.9.2-p318/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block (2 levels) in top_level'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `each'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block in top_level'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:88:in `top_level'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:66:in `block in run'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
  /home/users/.rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/bin/rake:33:in `&lt;top (required)&gt;'
  /home/users/.rvm/gems/ruby-1.9.2-p318/bin/rake:19:in `load'
  /home/users/.rvm/gems/ruby-1.9.2-p318/bin/rake:19:in `&lt;main&gt;'
  Tasks: TOP =&gt; db:migrate
  </code></pre>
  
  <p>Follwoing is my GemFile :</p>
  
  <pre><code>source 'https://rubygems.org'
  
  gem 'rails', '3.2.3'
  
  # Bundle edge Rails instead:
  # gem 'rails', :git =&gt; 'git://github.com/rails/rails.git'
  
  gem 'mysql2'
  gem 'devise'
  gem 'activeadmin', :git =&gt; 'https://github.com/gregbell/active_admin.git'
  gem 'therubyracer'
  gem 'formtastic'
  gem 'haml'
  gem 'paperclip'
  
  # Gems used only for assets and not required
  # in production environments by default.
  group :assets do
    gem 'sass-rails',   '~&gt; 3.2.3'
    gem 'coffee-rails', '~&gt; 3.2.1'
  
    # See https://github.com/sstephenson/execjs#readme for more supported runtimes
    # gem 'therubyracer', :platform =&gt; :ruby
  
    gem 'uglifier', '&gt;= 1.0.3'
  end
  
  gem 'jquery-rails'
  </code></pre>
  
  <p>Content of <strong>20120509055635_devise_create_admin_users.rb</strong> is</p>
  
  <pre><code>class DeviseCreateAdminUsers &lt; ActiveRecord::Migration
    def change
      create_table(:admin_users) do |t|
        t.database_authenticatable :null =&gt; false
        t.recoverable
        t.rememberable
        t.trackable
  
        # t.encryptable
        # t.confirmable
        # t.lockable :lock_strategy =&gt; :failed_attempts, :unlock_strategy =&gt; :both
        # t.token_authenticatable
  
  
        t.timestamps
      end
  
      # Create a default user
      AdminUser.create!(:email =&gt; 'admin@example.com', :password =&gt; 'password', :password_confirmation =&gt; 'password')
  
      add_index :admin_users, :email,                :unique =&gt; true
      add_index :admin_users, :reset_password_token, :unique =&gt; true
      # add_index :admin_users, :confirmation_token,   :unique =&gt; true
      # add_index :admin_users, :unlock_token,         :unique =&gt; true
      # add_index :admin_users, :authentication_token, :unique =&gt; true
    end
  
  end
  </code></pre>
  
  <p>I searched for the above issue and got <a href="https://github.com/plataformatec/devise/issues/833">this</a> , but this doesn't helped me out. Everywhere I found this solution only.
  Does any one came across this issue before, if yes what you did to tackle it? Any help on this will be appreciated. Thanks</p>