class Customer < ActiveRecord::Base has_many :ordersendclass Order < ActiveRecord::Base belongs_to :customerend如上代码两个model在做如下查询的时候：c = Customer.fir.....
分类：
其他好文 时间：
2014-07-10 10:03:57
阅读次数：
293
循环同构的最小表示法。 1 #include 2 #include 3 4 #define MAXN 10005 5 #define MAXL 105 6 7 char map[MAXN][MAXL]; 8 char buf[MAXL]; 9 10 int Min_exp(char str[...
分类：
其他好文 时间：
2014-07-07 23:06:44
阅读次数：
213
You are climbing a stair case. It takes n steps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways can you cli...
分类：
其他好文 时间：
2014-07-07 21:03:15
阅读次数：
157
http://acm.hdu.edu.cn/showproblem.php?pid=1232 1 #include 2 #include 3 #include 4 #include 5 using namespace std; 6 int n,m; 7 int bin[2005]; 8 in...
分类：
其他好文 时间：
2014-07-07 16:14:33
阅读次数：
145
It always seems that your vacuum will malfunction right before company is set to arrive. What do you do if your vacuum is not working correctly? Many ...
分类：
其他好文 时间：
2014-07-01 22:38:53
阅读次数：
305
Before I owned a pool I always thought that pool maintenance was going to be a real pain and troublesome. I had heard many horror stories from friends...
分类：
其他好文 时间：
2014-06-30 21:58:20
阅读次数：
316
The following packages should be installed:python-ibusibusibus-clutteribus-gtkibus-m17n: input many non-latin charactersibus-pinyinibus-qt4ibus-tablei...
分类：
系统相关 时间：
2014-06-30 13:14:49
阅读次数：
455
1 import java.awt.event.InputEvent; 2 3 import javax.swing.KeyStroke; 4 5 /** 6 * class KeyEvent: include many static key 7 * class KeyStroke: g...
分类：
其他好文 时间：
2014-06-30 12:46:06
阅读次数：
229
JAVA大数....
How Many Fibs?
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 3906 Accepted Submission(s): 1545
Problem Descri...
分类：
其他好文 时间：
2014-06-30 09:06:32
阅读次数：
160
