레일을 통해 has_many가 작동하지 않는 것 같습니다.

Question

두 번째 눈이 필요합니다. 두 플레이어 간의 경기를 만들면 Tournament.players는 빈 배열을 반환합니다.

코드 당신은 이중 :through 관계를 가질 필요가

class Tournament < ActiveRecord::Base 
    has_many :player_matches 
    has_many :matches 
    has_many :players, :through => :player_matches 
end 

class PlayerMatch < ActiveRecord::Base 
    belongs_to :player 
    belongs_to :match 
    belongs_to :tournament 
end 

class Player < ActiveRecord::Base 
    has_many :player_matches 
    has_many :matches, :through => :player_matches 
    has_many :tournaments, :through => :player_matches 
end 

Answer 1

: player_matches을 통해 matches 및 players을 통해

player_matches합니다.

class Tournament < ActiveRecord::Base 
    has_many :matches 
    has_many :player_matches, :through => :matches 
    has_many :players, :through => :player_matches 
end 

class PlayerMatch < ActiveRecord::Base 
    belongs_to :player 
    belongs_to :match 
end 

class Player < ActiveRecord::Base 
    has_many :player_matches 
    has_many :matches, :through => :player_matches 
    has_many :tournaments, :through => :player_matches 
end 

class Match < ActiveRecord::Base 
    belongs_to :tournament 
    has_many :player_matches 
    has_many :players, :through => :player_matches 
end