1.try 永远不会抛出异常 在 没有的时候 返回 nil
province_id = Province.find_by_name(prov).try(:id)
2.find(:first, :condotions) 方法 不言而与
mobile_info = MobileInfo.find(:first, :conditions => ["mobile_num = ? ", mobi...
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其他好文 时间:
2014-08-06 10:32:31
阅读次数:
304
分享下JQuery如何设置获取下拉菜单某个选项的值,多种方法,值得收藏。JQuery获取和设置Select选项获取Select :获取select 选中的 text :$(“#ddlRegType”).find(“option:selected”).text();获取select选中的 value:...
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Web程序 时间:
2014-08-06 06:15:10
阅读次数:
294
题目:Given two words (start and end), and a dictionary, find all shortest transformation sequence(s) from start to end, such that:Only one letter can b....
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编程语言 时间:
2014-08-06 01:52:30
阅读次数:
251
Problem DescriptionGiven two matrices A and B of size n×n, find the product of them.bobo hates big integers. So you are only asked to find the result ...
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其他好文 时间:
2014-08-06 01:43:40
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334
题目:Given two words (start and end), and a dictionary, find the length of shortest transformation sequence from start to end, such that:Only one letter...
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编程语言 时间:
2014-08-06 01:35:30
阅读次数:
389
Problem Description
bobo has a sequence a1,a2,…,an. He is allowed to swap two
adjacent numbers for no more than k times.
Find the minimum number of inversions after his swaps.
Note: The number...
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其他好文 时间:
2014-08-05 22:44:03
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248
Problem Description
Given two matrices A and B of size n×n, find the product of them.
bobo hates big integers. So you are only asked to find the result modulo 3.
Input
The input consists of...
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其他好文 时间:
2014-08-05 22:38:00
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248
Given an array of integers, every element appears three times except for one. Find that single one.
Note:
Your algorithm should have a linear runtime complexity. Could you implement it without u...
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其他好文 时间:
2014-08-05 22:35:00
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277
1、删掉工程中main.storyboard 后要删除plist文件中对应的键值,否则会报如下错误:Could not find a storyboard named 'Main' in bundle NSBundle2、删除main.storyboard后,需要在AppDelegate.m中初始化...
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其他好文 时间:
2014-08-05 22:27:20
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188
1.1 如果被打开程序不是自己的,则要找到被打开App的URL Schemes。 http://jbguide.me/2012/09/12/how-to-find-url-schemes%EF%BC%9F/ 1.2 如果被打开程序是自己写的,那么写程序时要实现 1) appname-info.plist里...
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移动开发 时间:
2014-08-05 19:42:40
阅读次数:
250