There are two problems here:

• MongoShardedClient#from_uri and URIParser#connection do not support returning a MongoShardedClient instance. This should either be fixed, or an exception should be thrown when this is used from a MongoShardedClient instance.

• When specifying the connection string URI from ENV['MONGODB_URI'], MongoShardedClient.new raises an exception when you specify more than one mongos.

ENV['MONGODB_URI'] = 'mongodb://brandonblack-mbpr.local:3333,brandonblack-mbpr.local:3334'
client = Mongo::MongoShardedClient.new
=> NoMethodError: undefined method `split' for #<Array:0x007fecc405a3d0>