Question

我正在尝试进行模式匹配并替换我的MongoDB mapReduce。我在map中减少了推文的来源。并获得重复的结果，如

1 - web has 38867
2 - <a href="http://www.tweetdeck.com" rel="nofollow">TweetDeck</a> has 23873
3 - <a href="http://www.hootsuite.com" rel="nofollow">HootSuite</a> has 10696
4 - <a href="http://twitterfeed.com" rel="nofollow">twitterfeed</a> has 9562
5 - <a href="http://twitter.com/#!/download/iphone" rel="nofollow">Twitter for iPhone</a> has 6818
6 - <a href="http://www.echofon.com/" rel="nofollow">Echofon</a> has 5869
7 - <a href="http://www.tweetdeck.com/" rel="nofollow">TweetDeck</a> has 5497

＃2和＃7之间的唯一区别是href中的“.com /”vs“.com”。我想在我的map函数中进行模式匹配，但是我遇到了编译错误。我可能会在翻译层面迷失方向。

PHP ==＆gt; Mongo ==＆gt;的JavaScript。

这是我的代码块

$map = 'function() {
            if (!this.source) {
                return;
            }
            s = this.source;
            s = s.replace(/\/\"/i,"/"");

            emit(s,1);
        }';

$reduce = "function(previous, current) {
    var count = 0;
    for (index in current) {
        count += current[index];
    }
    return count;
}";

$mapFunc = new MongoCode($map);
$reduceFunc = new MongoCode($reduce);
$collectionOutName = 'mrTweetSource';
$mr = $db->command(array(
    'mapreduce' => 'tweet',
    'map' => $mapFunc,
    'reduce' => $reduceFunc,
    'out'=>$collectionOutName));

结果是

(
    [assertion] => couldn't compile code for: _map
    [assertionCode] => 13598
    [errmsg] => db assertion failure
    [ok] => 0
)

Answer 1

通常，最简单的测试方法就是从shell运行M / R.这将有助于编译b / c shell可以识别错误的语法。

如果我使用“人类编译”技能，则以下内容看起来不对。

s = s.replace(/\/\"/i,"/"");

您正在转发/"并将其替换为/？看看"/""，这似乎是一个太多的双引号。

MongoDB中的replace（）MapReduce映射函数

1 个答案: