Rails - Aug 2006 - how to work with has_many :through

I''m trying to understand how to use the has_many :through construct.

I have two tables:  customers and vendors associated through
"assignments"
table.

Class Customer
  has_many :assignments
  has_ many :vendors, :through => :assignments
 . . . # other fields
end
Class Vendor
  has_many :assignments
  has_many :customers, :through => :assignments
 . . . # other fields
end

Class Assignment
  belongs_to  :customer
  belongs_to :vendor
 . . . # other fields
end

How do I build assignments?  By that, I mean assign a vendor to a customer?
I''m thinking that I should be able to do this:

v = Vendor.find(1)
c = Customer.find(1)
v.customers << c

but, that doesn''t work. Would someone help me with the correct syntax?


-- 
Best Regards,
-Larry
"Work, work, work...there is no satisfactory alternative."
            --- E.Taft Benson
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