小编ubu*_*ral的帖子

我成功安装了ActiveAdmin:

我的gemfile代码:

来源' https://rubygems.org '

 gem 'rails', '3.2.10'

 # Bundle edge Rails instead:
 # gem 'rails', :git => 'git://github.com/rails/rails.git'

 gem 'sqlite3'


 # Gems used only for assets and not required
 # in production environments by default.
 group :assets do
   gem 'sass-rails',   '~> 3.2.3'
   gem 'coffee-rails', '~> 3.2.1'

   # See https://github.com/sstephenson/execjs#readme for more supported runtimes
   # gem 'therubyracer', :platforms => :ruby

   gem 'uglifier', '>= 1.0.3'
 end

 gem 'jquery-rails'

 gem 'twitter-bootstrap-rails'

 gem 'activeadmin'

  # gem "meta_search",    '>= 1.1.0.pre'
 gem "spud_photos"
 gem 'devise' …

我想在application.html.erb中注释掉一些东西

 <!--
    <div id="user_nav">
 <% if user_signed_in? %>
   Signed in as <%= current_user.email %>. Not you?
   <%= link_to "Sign out", destroy_user_session_path %>
 <% else %>
   <%= link_to "Sign up", new_user_registration_path %> or
   <%= link_to "Sign in", new_user_session_path %>
<% end %>
</div>

//-->

这不可能.怎么办？