Rails - Jul 2006 - Adding attributes to many through associations

Hi,

I can''t figure out how to add the additional attributes in my join 
table.

I''m having a through-association between two models (Machine and 
Service). Each machine can have a certain number of services and a 
service can belong to several machines. When I create machines, I define 
which ones out of all services can be applied to this particular 
machine. Every chosen service should have several attributes (prices in 
this case) which will be different for each machine. Here''s my models:

class Machine < ActiveRecord::Base
  has_many :machine_service_items
  has_many :services, :through => :machine_service_items
end

class Service < ActiveRecord::Base
  has_many :machine_service_items
  has_many :machines, :through => :machine_service_items
end

class MachineServiceItem < ActiveRecord::Base
  belongs_to :machine
  belongs_to :service
end

In my add_machine view I list all the services and under them textfields 
to fill in the additional attributes for each of the services. What I 
find difficult is how to create many objects of MachineServiceItem from 
this form and also adding the right service id. I "think" I want
params
filled with arrays so I can create all the objects of MachineServiceItem 
in my controller but I don''t know how to get it. In my head the 
controller looks something like this:

def create
for machineserviceitem in params([:machineserviceitems])
   Machine.create(params([machineserviceitem])
end
end

Maybe... Really need some help on this one, been stuck here for some 
time now! :)

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