学习-Agile Web Development with Rails, 4th Edition

由于安装的是最新版Rails3.2+Ruby1.93,和书中当时的Rails 3.0.5不太一样，学习例子中遇到一些问题，总结如下：

1.Routing Error
No route matches [GET] "/assets/depot.css"
No route matches [GET] "/assets/logo.png"
Try running rake routes for more information on available routes.

原因：是由于Rails3.1以后Asset Pipeline默认是开着的，这样helper生产的连接不是以前public/javascripts而是/assets/javascripts/，同理/images和/stylesheets.
http://guides.rubyonrails.org/layouts_and_rendering.html#asset-tag-helpers

引用

If you are using Rails with the Asset Pipeline enabled, this helper will generate a link to /assets/javascripts/ rather than public/javascripts which was used in earlier versions of Rails. This link is then served by the Sprockets gem, which was introduced in Rails 3.1.

而这时assets目录在这三个目录任何一个下面即可：app/assets, lib/assets or vendor/assets

http://guides.rubyonrails.org/asset_pipeline.html

引用

Pipeline assets can be placed inside an application in one of three locations: app/assets, lib/assets or vendor/assets.

解决：rubyform上有人答复推荐降低rails版本到3.0.5，这个算是个快的解决办法，但总觉得没解决问题，回头用新的开发还是会遇到。其实可以很简答解决问题：
在app/assets下的对应目录加入相应的css,js,pic即可

C:\Ruby193\work\depot\app\assets 的目录

2012/03/13  13:52    <DIR>          .
2012/03/13  13:52    <DIR>          ..
2012/03/13  13:35    <DIR>          images
2012/03/13  09:58    <DIR>          javascripts
2012/03/13  13:52    <DIR>          stylesheets

2.Ajax无渐变效果(Highlighting Changes)
error:Missing template line_items/create, application/create

原因：3.1以后变化
解决：
1.\app\views\layouts\application.html.erb
<%= javascript_include_tag :defaults %> to <%= javascript_include_tag "application" %>
2.app/views/line_items/create.js.rjs 成create.js.erb，并修改内容：

page.replace_html('cart', render(@cart))

page[:current_item].visual_effect :highlight,
                                  :startcolor => "#88ff88",
                                  :endcolor => "#114411"
 改成
$('#cart').html("<%= escape_javascript(render(@cart)) %>");

$('#current_item').css({ 'background-color': "#88ff88" }).animate({ 'background-color': "#114411" }, 1000); //在jquery中animate不支持background-color,所以看不到变回去的动画效果，如果要实现得加载jquery.color.js,详情见官网api

3.隐藏提交订单后的提示信息(Iteration G1: Capturing an Order)

app/views/line_items/create.js.erb
page.select("#notice").each { |notice| notice.hide}
改成
$('#notice').hide();

4.well-paginate出错(Iteration G3: Pagination)
error:
NoMethodError: undefined method `paginate' for

原因：得安装well-paginate,安装完后重启rails server才行
按官网：（https://github.com/mislav/will_paginate/wiki/Installation）
在depot\Gemfile添加：

## Gemfile for Rails 3, Sinatra, or Merb
gem 'will_paginate'

然后：

bundle install

接着：
重启rails server