Ruby Gem NoMethodError - undefined method `map'

[vi...@ujoin.co]

Do you know if anything has changed with the OpenState Ruby Gem?  The code to find Legislators doesn't seem to work anymore.  We have had this code in production for a while, but are now getting this error

NoMethodError - undefined method `map' for #<String:0x007ff0b51941c0>

openstates (0.0.1) lib/openstates/model.rb:37:in `where'

This is the how we are calling the method.

OpenStates::Legislator.where(parameters)

parameters = {:state=>"Ca"}  # this is a hash