I'm trying to dump a collection from a database and restore it to another, using mongodump and mongorestore with the --uri CLI option, and -c for the collection name. Mongodump works as expected, but mongorestore fails with "cannot restore a collection without a specified database".

mongodump --uri=mongodb://user1:pass1@host1:port1/dbname -c mycoll

mongorestore --uri=mongodb://u2:p2@host2:port2/dbname -c mycoll dump/dbname/mycoll.bson

I would expect mongorestore to accept the same options as mongodump, but I have to specify the database name again using -d:

mongorestore --uri=mongodb://u2:p2@host2:port2/dbname -d dbname -c mycoll dump/dbname/mycoll.bson

This seems redundant, since the database name is already specficied in the uri option.