Rails - Nov 2007 - Error edit user view page

Hi there..

I have created a table and a join table

class CreateArrangements < ActiveRecord::Migration
  def self.up
    create_table :arrangements do |t|
      t.column :name, :string
    end
  end

  def self.down
    drop_table :arrangements
  end
end

****Join table**************

class AddTableArragementUsers < ActiveRecord::Migration
  def self.up
  create_table :arrangements_users, :id => false do |t|
      t.column :arrangement_id, :integer, :null => false
      t.column :user_id, :integer, :null => false

 end
 add_index "arrangements_users", "arrangement_id"
 add_index "arrangements_users", "user_id"
  end

  def self.down
  end
end

*************************

In the user-edit-view page a put in the following code:

<p><label
for="user[arrangement_ids][]">arrangement</label><br/>
<%= select_tag ''user[arrangement_ids][]'',
      options_from_collection_for_select(@arrangement, :id, :name,
@user.arrangements.collect{|arrangement| arrangement.id}),
    { :multiple => true, :size => 5 }%>
</p>

But i get the following error

You have a nil object when you didn''t expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.inject

Anyone idea?

Swoany
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