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MongoDB: Combine data from multiple collections into one..how?
... together by using the "reduce" out option in MongoDB 1.8+ map/reduce (see http://www.mongodb.org/display/DOCS/MapReduce#MapReduce-Outputoptions). You need to have some key in both collections that you can use as an _id.
For example, let's say you have a users collection and a comments collection ...
Why does the Scala compiler disallow overloaded methods with default arguments?
...hese lines mentioned in several threads.
The named argument spec is here:
http://www.scala-lang.org/sites/default/files/sids/rytz/Mon,%202009-11-09,%2017:29/named-args.pdf
It states:
Overloading If there are multiple overloaded alternatives of a method, at most one is
allowed to specify default...
Parse (split) a string in C++ using string delimiter (standard C++)
I am parsing a string in C++ using the following:
17 Answers
17
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Why does the C# compiler not fault code where a static method calls an instance method?
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How should I use try-with-resources with JDBC?
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How do you call Connection::setAutoCommit? Such a call is not allowed within the try between the con = and ps =. When getting a Connection from a DataSource that may be backed with a connection pool, we cannot assume how autoCommit is set.
...
How to move all files including hidden files into parent directory via *
...
You can find a comprehensive set of solutions on this in UNIX & Linux's answer to How do you move all files (including hidden) from one directory to another?. It shows solutions in Bash, zsh, ksh93, standard (POSIX) sh, etc.
You can ...
How can I use break or continue within for loop in Twig template?
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基于PECL OAuth打造微博应用 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...同时发送到多个微博平台，出于安全性的考虑，不会使用HTTP Basic，而会使用OAuth，这就需要我们先拿到Access Token和Access Token Secret。
以新浪微博为例，大致的代码如下：
<?php
session_start();
$request_token_url = 'http://api.t.sina.com.c...
How do I trim whitespace?
Is there a Python function that will trim whitespace (spaces and tabs) from a string?
15 Answers
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android on Text Change Listener
I have a situation, where there are two fields. field1 and field2 . All I want
to do is empty field2 when field1 is changed and vice versa. So at the end only
one field has content on it.
...