Ruby on Rails 笔记

刚才无意中发现一个不常用但很实用的方法, 赶快记下来

一直计较在Views模板输出ruby代码只能用<%= ... %>,这样很容易破坏其他代码的结构, 原来Rails有在<% ... %>里输出的方法呀 :roll: :

show.html.erb

以前总是这么写:
<ul>
<% 10.times do |i| -%>
  <li><%= i %></li>
<% end -%>
</ul>

原来也可以这么写:
<ul>
  <% 10.times do |i|
    concat "<li>#{i}</li>", binding
  end
  -%>
</ul>

舒服了... :D

[i]2009-12-23[/i]
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刚才看Rails API时发现原来可以在module里使用ActionController的方法, 在ActionController::UrlWriter文档中举了在module中调用具名路由的两个例子:

class User < ActiveRecord::Base
    include ActionController::UrlWriter         # !!!

    def name=(value)
      write_attribute('name', value)
      write_attribute('base_uri', users_path)   # !!!
    end
  end

class User < ActiveRecord::Base
    def name=(value)
      write_attribute('name', value)
      path = ActionController::UrlWriter.users_path   # !!!
      write_attribute('base_uri', path)               # !!!
    end
  end

但第二种方法没有测试成功
经过测试, 还可以调用url_for方法. 同理我想应该也可以调用其他的方法(如session?,以后测试再看吧) :wink:

[i]2010-1-21[/i]
==========================================

查看已安装gems文档

$ gem server -p <port>

在浏览器中打开地址: http://localhost:<port>/

更多gem信息见 http://docs.rubygems.org/

[i]2010-3-26[/i]
==========================================

[del]刚才看Railscasts[url=http://railscasts.com/episodes/78]第78节[/url]时发现原来还有formatted_..._path(:format)这样的方法，受用了，快快记下。[/del]
[i]2010-4-6[/i]
==========================================

删除所有Gems

# for *nix
GEMS=`gem list --no-versions`
for x in $GEMS ; do gem uninstall --a --ignore-dependencies $x; done

# for windows
gem list | cut -d" " -f1 | xargs gem uninstall -aIx

[i]2011-10-28[/i]
==========================================

我的.gemrc

---
:backtrace: falset
:benchmark: false
:bulk_threshold: 1000
:sources:
- http://rubygems.org
- http://gems.rubyforge.org
:update_sources: true
:verbose: true
#http_proxy: http://proxy.com
gem: --no-ri --no-rdoc

[i]2011-10-28[/i]
==========================================

兼容AR中Boolean的统一方法

def deleted=(value)
  self[:deleted_at] = ActiveRecord::ConnectionAdapters::Column.value_to_boolean(value) ? current_time : nil
end

[i]2011-12-19[/i]
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