Is there a function in mongo to return the number of documents that were updated in an update statement? I have tried to use count() but apparently the update statement only returns true or false ...

I am talking to multiple databases using Mongoid.override_database("database_name") using Mongoid with rails. How do I find the current database programmatically? Mongoid docs on sessions: http:/...

I have a query that takes too long to finish. I like to do some performance tests but after I check for one time (that takes currently ~30 seconds) the query start to run a lot faster (< 1 secon...

I have an array, which is output by a map/reduce method performed by MongoDB, it looks something like this: [{"minute"=>30.0, "hour"=>15.0, "date"=>5.0, "month"=>9.0, "year"=>2011.0...

I've been for some help on getting the highest value on a column for a mongo document. I can sort it and get the top/bottom, but I'm pretty sure there is a better way to do it. I tried the follow...

I am using MongoDB 1.6.3, to store a big collection (300k+ records). I added a composite index. db['collection_name'].getIndexes() [ { "name" : "_id_", "ns" : "db_name.event_logs", "key" : { ...

Assuming the following: irb> x irb> => {"_id"=> 123456, "welcome"=>"Hi!", "welcome2" => "Enjoy your stay!"} irb> coll.class irb> => Mongo::Collection How can I use the...