mongodb move documents from one collection to another collection

Question

How can documents be moved from one collection to another collection in MongoDB?? For example: I have lot of documents in

Answer 1

First option (Using mongo dump)

1.Get a dump from collection

mongodump -d db -c source_collection

2.Restore from collection

mongorestore -d db -c target_collection dir=dump/db_name/source_collection.bson

Second Option

Running aggregate

db.getCollection('source_collection').aggregate([ { $match: {"emailAddress" : "apitester@mailinator.com"} }, { $out: "target_collection" } ])

Third Option (Slowest)

Running a through for loop

db.getCollection('source_collection').find().forEach(function(docs){ db.getCollection('target_collection').insert(docs); }) print("Rolleback Completed!");