使用Rails 5.2.4.2，我有以下模型：

Team
  has_many :player_teams
  has_many :players, through: :player_teams

Role
  has_many :player_teams
  has_many :players, through: :player_teams

Player
  has_many :player_teams
  has_many :teams, through: :player_teams
  has_many :roles, through: :player_teams

PlayerTeam
  belongs_to :team
  belongs_to :player
  belongs_to :role

不知道如何将玩家添加到团队中。像下面这样添加是正确的方法吗？还是我需要先用角色和团队创建PlayerTeam示例？

role = Role.create(...)
team = Team.create(...)
player = Player.create(...)

player.roles << role => Ok
team.players << player => ActiveRecord::RecordInvalid Exception: Validation failed: Player teams team must exist

更新1

我知道下面的代码和皮埃尔的是正确的，但是有没有其他的方法来添加球员到球队？

player_teams = PlayerTeam.create(team: evaluator.team, role: evaluator.player_role)
player.player_teams << player_teams => Ok

假设我将角色添加到播放器

player.roles << Role.create()

如果我把球员加入球队，新的球员团队示例会被启动吗？如果没有新的球员团队示例，如何把球员加入球队？

更新2

看起来如果我想把球员加到队伍里

team.players << player

比我需要设置可选：true或单独的Role连接表将PlayerTeam的belongs_to：角色移动到单独的模型。