Searching in MongoDB

Question

Imagine you need to implement a search in MongoDB. You have collection of documents that look like this:

{text: \"This is some Text }
{text: \"this is another te         


        

Answer 1

Might be fun to do a Map Reduce:

mapper=function(){
    var words=this.text.match(/\S+\s*/g);
    for (w in words){
        emit(this._id, {'words':words})
    }
}

reducer=function(k,v){return {'words':this[0].words}}

This should get you a collection with the words separated out. There's probably a way of doing this with aggregations.

Answer 2

Maybe the full-text-search is your answer http://docs.mongodb.org/manual/core/index-text/ http://docs.mongodb.org/manual/reference/operator/query/text/

Code snippets from these references:

1 - db.comments.ensureIndex( { comments: "text" } )

The following code searches for comments that contain the words This or another but do not contain the term hehe:

2- db.comments.find( { $text: { $search: "This another -hehe" } } )