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我正在尝试使用Node.js来编写MongoDB map/reduce作业。我有调用map reduce的node.js代码正常工作,但我需要在mapper方法中执行Node.js调用。它看起来像是将映射器(和reducer)解释为Javascript,而不是Node.js.是否可以在mongoDB map reduce的map函数中使用node.js?
有没有一种方法来执行映射器和Reducer作为Node.js函数?有一些技巧或解决方法,我可以通过Javascript调用Node.js吗?
我的代码:
var mongo = require('mongodb'),
Server = mongo.Server,
Db = mongo.Db;
var fbFeed = require('./getFeeds');
var server = new Server('localhost', 27017, {auto_reconnect: true});
var db = new Db('test', server);
var map = function() {
fbFeed.getFbFeed(this.dbId, function(record) {
emit(record.fbId, record);
});
}
var reduce = function (key, values) {
return values;
}
db.open(function (err, db) {
if (!err) {
db.collection('facebookToScan', function (err, collection) {
if (!err) {
collection.mapReduce(map, reduce, {'out': "fbClicks"}, function(err, collection) {
});
}
});
}
});
(其中” ./getFeeds'包含getFbFeed
)
而且我的错误是:
mr failed, removing collection :: caused by :: 9014 map invoke failed: JS Error: ReferenceError: fbFeed is not defined nofile_b:1