Python 向模型添加多个标记

我有以下型号：

class Investor(Profile):
ROLE = (
    ('AN', 'Angel Investor'),
    ('VC', 'Venture Capital'),
    ('SC', 'Seed Capital')
)
role = models.CharField(max_length=2, default='AN', choices=ROLE)
min_inv = models.DecimalField(
    default=0, max_digits=20, decimal_places=2,
    verbose_name='Minimum Investments per year')
max_inv = models.DecimalField(
    default=0, max_digits=20, decimal_places=2,
    verbose_name='Maximum investments per year')
no_startups = models.IntegerField(
    default=0, verbose_name='Number of investments per year')
rating_sum = models.FloatField(default=0)
no_raters = models.IntegerField(default=0)

我想在此模型中添加多个标记。 -类别 -舞台 -资助

我希望投资者被分配到多个类别、阶段和资金。 因此，投资者可以绑定到多个类别 多阶段 以及多种资金类型

我如何编辑模型才能做到这一点？

您能为连接的模型添加关系吗

class Investor(Profile):
  ROLE = (
    ('AN', 'Angel Investor'),
    ('VC', 'Venture Capital'),
    ('SC', 'Seed Capital')
  )
  role = models.CharField(max_length=2, default='AN', choices=ROLE)
  min_inv = models.DecimalField(
    default=0, max_digits=20, decimal_places=2,
    verbose_name='Minimum Investments per year')
  max_inv = models.DecimalField(
    default=0, max_digits=20, decimal_places=2,
    verbose_name='Maximum investments per year')
  no_startups = models.IntegerField(
    default=0, verbose_name='Number of investments per year')
  rating_sum = models.FloatField(default=0)
  no_raters = models.IntegerField(default=0)
  categories = models.ManyToMany(Category)
  stages = models.ManyToMany(Stage)
  fundings = models.ManyToMany(Funding)

然后，使用manytomen可以指定阶段

investor = Investor.objects.all()[0]
investor.categories.add(category_instance_one, category_instance_two)
investor.categories.all() # retrieves all categories that this investor has