Mongo: count the number of word occurrences in a set of documents

Question

I have a set of documents in Mongo. Say:

[
    { summary:\"This is good\" },
    { summary:\"This is bad\" },
    { summary:\"Something that is neither good         


        

Answer 1

You can use #split. Try Below query

db.summary.aggregate([
{ $project : { summary : { $split: ["$summary", " "] } } },
{ $unwind : "$summary" },
{ $group : { _id:  "$summary" , total : { "$sum" : 1 } } },
{ $sort : { total : -1 } }
]);