JavaScript MongoDB: Update a string field in all documents mongodb update string to date,mongodb update string to objectid,

I have a MongoDB database with many documents in a collection. Each of those articles has a field called myField containing a string.

Is it possible for me to run a bulk update on all documents in the collection, modifying the value of myField for each document?

In my case I just want to strip off a trailing ".html" from each of the fields. I'm using node.js to interact with Mongo in my application but I'd prefer to be able to run a single command on the mongo command prompt to do this update if that's possible.

Answer:1

Yest it possible to update mongoDB document information from command prompt using mongo.

say script file name migration.js and go to this file directory and open command prompt and run this command.

mongo localhost/dbName migration.js

and migration.js code like:

print('Please wait it may will take some time to complete migration');
print('....');

db.collectionName.find().forEach( function(doc) {

    if(!doc._id) {
        print('No doc found');
        return;
    }
    // if need can apply logic to update myField

    db.collectionName.update({_id: doc._id}, {$set: {myField: "newVale"}});
});

print('Migration has been completed :)');
Answer:2

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