Rails - Aug 2006 - How update a record which hasn''t id column?

Hi, I''ve two database tables 1-N related and one of them
doesn''t have id
column:

matches (id, more columns), match_details(match_id, ... more columns)

Also have two models that represents these tables:

Match                     MatchDetail
has_one :match_detail     belongs_to :match,
                                     :foreign_key =>
''match_id''

When I create a Match object with a new MatchDetail object related to 
it,
everything works fine, but when I try to update some MatchDetail 
attributes
I get an update error from DB:

@match = Match.new
@match.match_detail = MatchDetail.new
@match.save
OK!!!

@match = Match.find(params[:id])
@match.play <-------- THIS METHOD MODIFIY SOME VALUES OF match_detail
@match.save

Mysql::Error: Unknown column ''id'' in ''where
clause'': UPDATE
match_details SET
`home_goals` = 2, `match_id` = 1, `away_goals` = 0 WHERE id = NULL

id doesn''t exist because the migration for this table specified not id 
column:

    create_table :match_details, :id => false do |t|
      t.column :match_id, :integer, :null => false
      t.column :home_goals, :integer, :default => 0
      t.column :away_goals, :integer, :default => 0
    end

I also have try to declare match_id column as primary key, but doesn''t 
work,
it raises the same error.
What I forgot to do?



-- 
Posted via http://www.ruby-forum.com/.

As almost always I answer to myself. I didn''t find the solution,
but I have cerate match_details table with an id, it easier and I don''t
wanna waste time and effort to solve that problem.

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Posted via http://www.ruby-forum.com/.