starting to flesh out instance model associations

lib/fog/aws/models/ec2/instance.rb

@@ -23,6 +23,14 @@ module Fog
         attribute :reason
         attribute :user_data
 
+        def address
+          connection.addresses.select {|address| address.instance_id == @instance_id}.first
+        end
+
+        def address=(new_address)
+          connection.associate_address(@instance_id, new_address.public_ip)
+        end
+
         def delete
           connection.terminate_instances(@instance_id)
           true
@@ -44,6 +52,14 @@ module Fog
           end
         end
 
+        def volumes
+          connection.volumes.all.select {|volume| volume.instance_id == @instance_id}
+        end
+
+        def volume=(new_volume)
+          connection.attach_volume(@instance_id, new_volume.volume_id, new_volume.device)
+        end
+
         def save
           options = {}
           if @availability_zone

lib/fog/aws/models/ec2/volume.rb

@@ -6,7 +6,8 @@ module Fog
 
         attribute :attachment_time,   'attachmentTime'
         attribute :availability_zone, 'availabilityZone'
-        attribute :device,            'createTime'
+        attribute :create_time,       'createTime'
+        attribute :device
         attribute :instance_id,       'instanceId'
         attribute :size
         attribute :snapshot_id,       'snapshotId'