specialized collections using has_many

Here's the following scenario:

You have a ticketing system. You have a User that can create tickets. That same User can be assigned tickets. So how can you specify a has_many for both cases for the User?

Table Schema:

CREATE TABLE User
(
  id    INT,
  title   VARCHAR(42),
  created_by    INT,
  assigned_to    INT,
)

The answer:

class User
has_many :assigned_tickets, :foreign_key => 'assigned_to', :class => 'Ticket'
has_many :created_tickets, :foreign_key => 'created_by', :class => 'Ticket'
end

In action:

u = User.find(:first)

render :partial => 'tickets/assigned_tickets', :collection => u.assigned_tickets
render :partial => 'tickets/created_tickets', :collection => u.created_tickets