Django 通过在其他查询中使用来过滤对象

我有两个模特.Procedures和ProcedureCategories.现在，每个Procedure都可以有一个ProcedureCategory的外键.

我想做两件事:为我的用户组获取所有特定类型的Procedures个.并获取这Procedures项中使用的所有类别.

以下是我的模特:

class ProcedureCategories(models.Model):
    name = models.CharField(
        max_length=200,
        help_text="Enter category name."
    )

    def __str__(self):
        return self.name

    def __lt__(self, other):
        return self.name < other.name

class Procedure(models.Model):
    """Model representing a task (but not a specific copy of a procedure)."""
    title = models.CharField(max_length=200)
    type = models.ManyToManyField(ProcedureTypes, help_text="Select a type for this procedure")
    summary = RichTextField(max_length=1000, help_text="Enter a brief description of the task", blank=True)
    groups = models.ManyToManyField(Group, help_text="Select which groups should be assigned for the task", blank=True)
    category = models.ForeignKey(ProcedureCategories, on_delete=models.PROTECT, help_text="Select which category should be assigned for the task", blank=True, null=True)
    date_done = models.DateTimeField(null=True, blank=True)

    def __str__(self):
        """String for representing the Model object."""
        return self.title

第一件事很简单:

procedureModels = Procedure.objects.filter(type=2, groups__user=request.user)

这为我提供了类型2的全部Procedures个正确的用户组.

但我如何才能得到这Procedures个项目中使用的所有ProcedureCategorires个项目呢？

ProcedureCategories.filter()?

我可能需要以某种方式加入其中.在Django 怎么才能做到这一点？