By accident I just found out that if you type the ActiveRecord model name in your Rails console session (script/console), it prints out all the attributes of your model.

Now more trips to your database, to find out how attributes are named!

Delayed:netmonic schmidp$ script/console 
Loading development environment (Rails 1.99.0)
>> XenServer
=> XenServer(id: integer, hostname: string,
created_at: datetime, updated_at: datetime, slots: integer,
created_by: integer, updated_by: integer)
>> XenVm
=> XenVm(id: integer, customer_id: integer,
xen_server_id: integer, name: string, memory_size: integer,
swap_size: integer, disk_size: integer, architecture: string,
distribution: string, filesystem: string,
created_at: datetime, updated_at: datetime, internal_name: string,
state_id: integer, created_by: integer,
updated_by: integer)
>>