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主题: 让ActiveRecord更加active

作者 正文
rainchen
等级: 1星会员
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文章: 79
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来自: 广州

       时间: 2007-08-30 19:42   关键字:  rails       

广告语:你觉得Rails现在的ActiveRecord还不够活跃、还不够DSL吗?想让它更有抱负吗?那么你需要Ambition,马上装上这颗“野心”,让数据来的更猛烈些。

使用了本产品,你将可以:
User.first
"SELECT * FROM users LIMIT 1"

User.select { |m| m.name != 'macgyver' }
"SELECT * FROM users WHERE users.`name` <> 'macgyver'"

User.select { |u| u.email =~ /chris/ }.first
"SELECT * FROM users WHERE (users.`email` REGEXP 'chris') LIMIT 1"

User.select { |u| u.karma > 20 }.sort_by(&:karma).first(5)
"SELECT * FROM users WHERE (users.`karma` > 20)
ORDER BY users.karma LIMIT 5"

User.select { |u| u.email =~ 'ch%' }.size
"SELECT count(*) AS count_all FROM users
WHERE (users.`email` LIKE 'ch%')"

User.sort_by { |u| [ u.email, -u.created_at ] }
"SELECT * FROM users ORDER BY users.email, users.created_at DESC"

User.detect { |u| u.email =~ 'chris%' && u.profile.blog == 'Err' }
"SELECT users.`id` AS t0_r0 ... FROM users
LEFT OUTER JOIN profiles ON profiles.user_id = users.id
WHERE ((users.`email` LIKE 'chris%' AND profiles.blog = 'Err'))
LIMIT 1"

ORM?ROM?!
>> user = User.select { |u| u.name == 'Dio' }
=> (Query object: call #to_sql or #to_hash to inspect...)
>> user.to_sql
=> "SELECT * FROM users WHERE users.`name` = 'Dio'"

还担心从C中取到的数据而在V中根本没有用上而觉得浪费感情吗?
class BandsController < ApplicationController
def index
@bands = Band.sort_by(&:name)
end
end

现在 @bands 不再是一个数据集合在战斗,只有当真正访问到里面的数据条目时它才会召唤db engine附身,如:
<h1>Rocktastic Bands<h1>
<ul>
<% @bands.each do |band| %>
<li><%= band %></li>
<% end %>
</ul>

更过份的是,你的缓存终于可以放开手脚可以大显身手了:
<h1>Rocktastic Bands<h1>
<% cache do %>
<ul>
<% @bands.each do |band| %>
<li><%= band %></li>
<% end %>
</ul>
<% end %>

还等什么,赶紧打开你的console通过gem来订购吧:
http://projects.require.errtheblog.com/browser/ambition/README

更多详情请敲打我们的24小时热线URL:http://errtheblog.com/post/10722

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