Rails - Mar 2008 - Creating a default, empty row in Table with user_id fails

Hi, I''m stuck with something quite easy. I''ve done this before
to create
an empty row in a table connected to a current_user...and that looks
like this (placed in the user_controller''s create method):

# Creating a default, empty row in Presentations Table
  @presentation = current_user.presentation
  @presentation = current_user.create_presentation unless @presentation

# Creating a default, empty row in Entries Table
  @entry = current_user.entry
  @entry = current_user.create_entry unless @entry

Then I added a third table called Specs and wanted to create the same
thing.

 @spec = current_user.spec
 @spec = current_user.create_spec unless @spec

But it refuses to create an empty row in the table connected to a
user_id...

Can''t understand why...
Models involved are: User.rb & Spec.rb
###################################################
class User < ActiveRecord::Base #class definition
has_one :spec
has_one :presentation
has_one :entry

###################################################
class Spec < ActiveRecord::Base
belongs_to :user

###################################################
(the specs table works as long as I manually insert the user_id and
whitespace)
###################################################
 create_table "specs", :force => true do |t|
    t.column "user_id",                    :integer
    t.column "first_name",                 :string
    t.column "last_name",                  :string
    t.column "gender",                     :string
    t.column "occupation",                 :string
    t.column "brithdate",                  :datetime
    t.column "city",                       :string
    t.column "country",                    :string
    t.column "zip_code",                   :string

####################################################

please, this such a stupid error...anyone provide me with a solution
...I''m going blind by my own code
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