connected?

# File activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb, line 115
    def self.connected?
      klass = self
      until klass == ActiveRecord::Base.superclass
        if active_connections[klass.name]
          return true
        else
          klass = klass.superclass
        end
      end
      return false
    end