Django模型字段限制从其他模型字段中选择

Question

好吧，我正在做足球应用程序，我有一个固定装置或游戏模型，它要做的是得到两个团队，而且它为比赛的进行增加了时间和东西，但是我还有FixtureRedCard和FixtureGoals，现在正在发生的是FixtureGoals和FixtureRedCard拥有3个字段，分别是灯具的外键和团队的进球，然后球队又进球来显示哪个球员做到了……

基本治具类

class Fixture(TitleAndSlugModel):
    """
    A division match fixture
    """
    division = models.ForeignKey(Division)
    fixture_date_time = models.DateTimeField()
    team_a = models.ForeignKey("team.Team", related_name="team_a")
    team_b = models.ForeignKey("team.Team", related_name="team_b")

治具目标

class FixtureGoal(BaseModel):
    """
    A goal recorded against a match fixture
    """
    fixture = models.ForeignKey(Fixture)
    team = models.ForeignKey("team.Team")
    player = ChainedForeignKey(
      "team.TeamPlayer", 
      chained_field="team", 
      chained_model_field="team", 
      show_all=False,
      auto_choose=True,
      blank=True, null=True)

    class Meta:
        ordering = ["fixture", "team",]

    def __unicode__(self):
        return u'%s (%s)' % (self.fixture, self.player)

灯具红卡

class FixtureRedCard(BaseModel):
    """
    A red card recorded against a match fixture
    """
    fixture = models.ForeignKey(Fixture)
    team = models.ForeignKey("team.Team")
    player = ChainedForeignKey(
      "team.TeamPlayer", 
      chained_field="team", 
      chained_model_field="team", 
      show_all=False,
      auto_choose=True,
      blank=True, null=True)

    class Meta:
        ordering = ["fixture", "team",]

    def __unicode__(self):
        return u'%s (%s)' % (self.fixture, self.player)

我要做的是将选择限制在Fixture上选择的team_a和team_b中，对于fixtureredcard和Fixturegoal类中的现场团队，我该如何实现？

谢谢

Answer 1

请查看此Django代码段中的示例。