ruby on rails - ActiveRecord::AssociationTypeMismatch: for has_many :through relationship -

i modeling game has many players. players can play multiple games. have users, games , played_game acting join table.

this first foray has_many :through relationships i'm hopeful simple question. or @ least question simple resolution.

class user < activerecord::base    has_many :played_games    has_many :games, :through => :played_games   end  class game < activerecord::base    has_many :played_games    has_many :users, :through => :played_games end  class playedgame < activerecord::base   belongs_to :users   belongs_to :games end 

this happens when try add game user (from console):

user.first.played_games << game.first 

results in:

activerecord::associationtypemismatch: playedgame(#70279902258580) expected, got game(#70279901145600) 

ok, maybe i'm misunderstanding. perhaps it's games should try add to:

user.first.games << game.first.id 

results in:

nameerror: uninitialized constant user::games 

any or link documentation appreciated. in advance!

the problem appears you've defined belongs_to associations on playedgame incorrectly plural when should singular. change them to:

class playedgame < activerecord::base   belongs_to :user   belongs_to :game end 

and should able use:

user.first.games << game.first