rails提供了相当方便的扩展，你可以这样实现：
在application.rb中加入：
config.paths["config/routes"] += Dir[Rails.root.join("config/routes/*.rb")]在config中创建routes文件夹，将mobile_routes.rb放到routes文件夹下即可，rails会自动将routes文件夹下的文件加载。mobile_routes.rb文件的写法与routes.rb文件一样！
分拆routes.rb
2012.03.12
项目需要给移动平台提供API，在routes.rb中已经配置了很多resources，如果再加入API的resources会使得routes.rb变得非常庞大，不利于管理，解决办法当然是希望能将API的resources写到另一个文件中去，如：mobile_routes.rb。
mobile_routes.rb文件的写法与routes.rb文件一样！
mobile_routes.rb文件的写法与routes.rb文件一样！
ROR开发小技巧
2011.12.25ruby-1.9.2-p180 :055 > File.join("lib/","ruby","gem.rb")
=> "lib/ruby/gem.rb"
ruby-1.9.2-p180 :058 > [1,2,3] - [1,2]
=> [3]
ruby-1.9.2-p180 :059 > [1,2,3] & [1,2]
=> [1, 2]
ruby-1.9.2-p180 :060 > [1,2,3] + [1,2,3,4]
=> [1, 2, 3, 1, 2, 3, 4]
ruby-1.9.2-p180 :066 > %w(a d c d 1 2 3)
=> ["a", "d", "c", "d", "1", "2", "3"]
ruby-1.9.2-p180 :074 > Hash["a",1,"b",2]
=> {"a"=>1, "b"=>2}
ruby-1.9.2-p180 :075 > Hash[*["a",1,"b",2]]
=> {"a"=>1, "b"=>2}
ruby-1.9.2-p180 :075 > Array("a".."z").select.with_index {|x,i| i%3 == 2}
=> ["c", "f", "i", "l", "o", "r", "u", "x"]
# coding:utf-8 # unicode转义 "" << 0x6f22 #=> 漢
class Object
# returns instance methods of current object's class and its singleton methods
def lm # abbr of local methods
self.methods.sort - self.class.superclass.instance_methods
end
end参考：http://ruby-china.org/topics/541
rails中的html_escape,escape_javascript
2011.12.17
ERB::Util
ActionView::Helpers::JavaScriptHelper actionpack/lib/action_view/helpers/javascript_helper.rb
activesupport/lib/active_support/core_ext/string/output_safety.rb
html_escape(s)
A utility method for escaping HTML tag characters. This method is also aliased as h.
In your ERB templates, use this method to escape any unsafe content. For example:
<%=h @person.name %>
Example:
puts html_escape("is a > 0 & a < 10?") # => is a > 0 & a < 10?
Also aliased as: h
Source: hide
# File activesupport/lib/active_support/core_ext/string/output_safety.rb, line 18 def html_escape(s) s = s.to_s if s.html_safe? s else s.gsub(/&/, "&").gsub(/\"/, """).gsub(/>/, ">").gsub(/</, "<").html_safe end end
escape_javascript(javascript)
Escape carrier returns and single and double quotes for JavaScript segments. Also available through the alias j(). This is particularly helpful in JavaScript responses, like:
$('some_element').replaceWith('<%=j render 'some/element_template' %>');
Also aliased as: j
Source: hide
# File actionpack/lib/action_view/helpers/javascript_helper.rb, line 19 def escape_javascript(javascript) if javascript result = javascript.gsub(/(\\|<\/|\r\n|[\n\r"'])/) {|match| JS_ESCAPE_MAP[match] } javascript.html_safe? ? result.html_safe : result else '' end end
in_groups_of
2011.12.02
in_groups_of 这个方法可以将数组分组，的第一个参数指示几个元素一组，而第二个参数指示了当最后一组缺元素时用什么填补位置
%w(1 2 3 4 5 6 7).in_groups_of(3) {|g| p g}
["1", "2", "3"]
["4", "5", "6"]
["7", nil, nil]
%w(1 2 3).in_groups_of(2, ' ') {|g| p g}
["1", "2"]
["3", " "]
%w(1 2 3).in_groups_of(2, false) {|g| p g}
["1", "2"]
["3"]
<table>
<% @tasks.in_groups_of(4) do |row_tasks| %>
<tr>
<% for task in row_tasks %>
<td><%= task.name %></td>
<% end %>
</tr>
<% end %>
</table>