Rails - Jul 2006 - Saving an ActiveRecord object

I get this error when I try to save an object that extends of 
ActiveRecord:

NoMethodError in TeamController#add_player

You have a nil object when you didn''t expect it!
The error occured while evaluating nil.keys

....
....

#{RAILS_ROOT}/app/models/player.rb:17:in `create_player''
#{RAILS_ROOT}/app/controllers/team_controller.rb:53:in `add_player''

And my Player model is:

class Player < ActiveRecord::Base
  belongs_to :team

  # Crea un jugador con los valores por defecto
  def Player.create_player(team_id)
    player = Player.new
    player.relate_to_team(team_id)
    player.save <-------------------------------- LINE 17
    return player
  end

  # Relaciona el jugador con un equipo
  def relate_to_team(team_id)
    @team_id = team_id
  end
end

What means that error? Do Player class hasn''t a save method?





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

Well, the full stacktrace is:

/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:1557:in
`attribute_names''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:2060:in
`clone_attributes''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:1519:in
`attributes''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:1945:in
`attributes_with_quotes''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:1725:in
`update_without_lock''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/locking.rb:33:in
`update_without_callbacks''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/callbacks.rb:274:in
`update_without_timestamps''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/timestamp.rb:39:in
`update''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:1718:in
`create_or_update_without_callbacks''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/callbacks.rb:249:in
`create_or_update''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:1392:in
`save_without_validation''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/validations.rb:724:in
`save_without_transactions''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/transactions.rb:126:in
`save''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/connection_adapters/abstract/database_statements.rb:51:in
`transaction''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/transactions.rb:91:in
`transaction''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/transactions.rb:118:in
`transaction''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/transactions.rb:126:in
`save''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:1398:in
`save_without_validation!''
/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/validations.rb:734:in
`save!''
#{RAILS_ROOT}/app/models/player.rb:15:in `create_player''
#{RAILS_ROOT}/app/controllers/team_controller.rb:53:in `add_player''


And seeing the source code for base.rb, I notice it failed at:

# Returns an array of names for the attributes available on this object 
sorted alphabetically.

def attribute_names
  @attributes.keys.sort <---------- HERE IS THE ERROR
end

What I''m doing wrong?

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