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://mongoid.org/en/moped/docs/driver.html define methods to override database but do not define a way to get the current database in use.
Got it!
Mongoid.default_session.options[:database]
The new way to get this is
Mongoid::Config.clients["default"]["database"]
You can also just have a look at
Mongoid::Config.clients
to see what else is available.
If you want the overrided database you actually need to use
Mongoid::Threaded.database_override
Running Mongoid.default_session.options[:database] gives an error that default_session is invalid. It is now default_client. That works wonderfully.
Run it without the [:database] to get all the option and see the full configuration of your database.
Mongoid::Config.clients["default"]["database"] assumes you are NOT using the uri version of mongoid.yml. You will get nil in all cases. Use Mongoid::Config.clients["default"] to get the full configuration of the current database, or Mongoid::Config.clients["default"]['uri'] to give you just the full uri.
Pick the database name from the URI after the last port number/. There could be severalif using a sharded configuration
来源：https://stackoverflow.com/questions/13039368/how-to-programmatically-get-the-current-database-mongoid-is-writing-to