Rails - Aug 2007 - has_many through, model lost their methods after second load

hello

I''m using the has_many through association, because i want additional
attributes in the assignment-table. my association looks like this:

class Task < ActiveRecord::Base
  has_many :assignments, :dependent => :destroy
  has_many :users, :through => :assignments

...

class Assignment < ActiveRecord::Base
  belongs_to :user
  belongs_to :task
end


class User < ActiveRecord::Base
  has_many :assignments, :dependent => :destroy
  has_many :tasks, :through => :assignments

....

my Assignment-Model has also the attribut "accepted". When I search
for
unaccepted Tasks for a certain user I use the class-method:

class User ....
  def unaccepted_tasks
    self.tasks.find :all, :conditions => ["accepted = ?", false],
:order
=> "due_date DESC"
  end

Ok. that works. but when I now try loop over the tasks and use its own
method users (task.users...), i get an error.

my controller:
def myTasks
    @tasks = @current_user.unaccepted_tasks
end

my view:
<%for task in @tasks %>
    <tr>
      <td>
        <%= link_to task.name, :controller => "tasks", :action
=>
"show", :id => task %>
      </td>
      <td>
      <% unless task.users.empty?
          owner = Array.new
          task.assignments.each do |ass|
      if ass.accepted?
          nick = "<span
class=''accepted''>#{ass.user.nick.to_s}</span>"
      else
           nick = "<span
class=''unaccepted''>#{ass.user.nick.to_s}</span>"
            end
      owner << nick
    end %>
          <%= owner.join(", ")%>
    <% end %>
    </td>
<% end %>

the error:
undefined method `users'' for #<Task:0xb69dc964>

funny information. the first time I load the action myTaks works. but
the second (and later) request fails.

Any ideas?

greetings
benni
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