创建具有两级父表的django rest framework视图集

• 部门
• 课程

A CourseInstance Department CourseInstanceTime . 简化模型如下:

class Department(models.Model):
    """Academic Department"""

    name = models.CharField(max_length=30, unique=True)

class Course(models.Model):
    """Courses in the course catalog"""

    course_name = models.CharField(max_length=30, unique=True)
    department = models.ForeignKey(Department, on_delete=models.PROTECT)
    course_number = models.DecimalField(decimal_places=0, max_digits=3, unique=True)

    class Meta:
        unique_together = (("department", "course_number"),)

class CourseInstance(models.Model):
    """A Scheduled running of a particular coursee"""

    start_date = models.DateField(help_text='Course Start Date', verbose_name='Start Date')
    end_date = models.DateField(help_text='Course Start Date', verbose_name='Start Date')
    course = models.ForeignKey(Course, on_delete=models.deletion.CASCADE)

class CourseInstanceTime(models.Model):

    day = models.CharField(max_length=3)
    start_time = models.TimeField()
    end_time = models.TimeField()
    course_instance = models.ForeignKey(CourseInstance, on_delete=models.deletion.CASCADE)

我想创建一个 课程实例 包括部门名称。我可以用 SlugField

课程=serializers.SlugRelatedField( 多=假, 只读=假, slug\u field='课程编号', 查询集=models.Course.objects.all() )

class Meta:
    model = models.Course
    fields = (
        'id', 
        #'department',
        'course', 
        'start_date',
        'end_date',
    )

我不知道该怎么做。