mongoDB : renaming column name in collection [duplicate]

Answer 1

You can use a $rename modifier.

db.collection.update({}, {$rename: {'XUknown': 'XString'}}, false, true);

You might also refresh your knowledge of update().

Answer 2

You can rename all the document by specify "Multi true" applicable to all the documents in the collection.

db.collection.update({}, {$rename: {'XUknown': 'XString'}}, {multi:true});