mongoid-dynamic_clients

https://github.com/pavlo/mongoid-dynamic-clients

The gem makes it easier to switch databases at runtime without the need to configure them all in `mongoid.yml` file. This is helpful when you do not know the databases you're connecting to at the build time, say you're developing a multi-tenancy or a white-labeable application where every tenant has its own database and you do not have the ability to enumerate them all in `mongoid.yml`