使用build不会在has_many上创建连接模型：通过关联

My 2 models:

我的2个型号：

Class TeamHistory < ActiveRecord::Base
  has_many :player_to_team_histories
  has_many :players, through: :player_to_team_histories

  belongs_to :team
end

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