Rails追加不添加对象has_many：通过

当我试图通过has_many：through关系添加对象时，我收到了奇怪的行为。Rails追加不添加对象has_many：通过

我的模型：

Class Player < ActiveRecord::Base 
    has_many :player_to_team_histories 
    has_many :team_histories, through: :player_to_team_histories 
end 
Class TeamHistory < ActiveRecord::Base 
    has_many :player_to_team_histories 
    has_many :players, through: :player_to_team_histories 
end

代码：

>>p = Player.first 
>>p.team_histories.count 
0 
>>p.team_histories.append TeamHistory.create 
>>p.team_histories.count 
0 
>>p.team_histories.push TeamHistory.create 
>>p.team_histories.count 
1 
>>p.team_histories << TeamHistory.create 
>>p.team_histories.count 
2

为什么append没有新创建TeamHistory添加到team_histories阵列？

我正在使用Ruby 1.9.2。

更新

发布一个问题Github上： https://github.com/rails/rails/issues/7364

来源

2012-08-09 Tyler DeWitt

不错的问题。我认为这是微不足道的，但我找不到任何附加方法的文档... – davidrac 2012-08-09 19:04:41