class Game(models.Model):
    name = models.CharField(max_length=45)
    uri = models.CharField(max_length=45)
    developer = models.ForeignKey(Developer)
    genre = models.ForeignKey(Genre)
    platform = models.ForeignKey(Platform)
    properties = models.ManyToManyField(GameProperty)

    class Meta:
        ordering = ['name']

    def __unicode__(self):
        return self.name

class GameProperty(models.Model):
    name = models.CharField(max_length=45)
    game = models.ForeignKey(Game)

    class Meta:
        verbose_name_plural = 'game properties'

class Platform(models.Model):
    name = models.CharField(max_length=45)
    tag = models.CharField(max_length=10)

    def __unicode__(self):
        return self.name