connection=

# File activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb, line 287
    def self.connection=(spec) #:nodoc:
      if spec.kind_of?(ActiveRecord::ConnectionAdapters::AbstractAdapter)
        active_connections[name] = spec
      elsif spec.kind_of?(ConnectionSpecification)
        config = spec.config.reverse_merge(:allow_concurrency => @@allow_concurrency)
        self.connection = self.send(spec.adapter_method, config)
      elsif spec.nil?
        raise ConnectionNotEstablished
      else
        establish_connection spec
      end
    end