django rest framework暴露api

一、创建序列化模型文件serializers.py

class Course(models.Model):
    """
    课程
    """
    title = models.CharField(verbose_name="课程名称", max_length=128)
    course_img = models.CharField(verbose_name="课程图片", max_length=128)
    level_choices = (
        (1,"初级"),
        (2,"中级"),
        (3,"高级"),
    )
    level = models.IntegerField(verbose_name="难易程度", choices=level_choices, default=1)

    def __str__(self):
        return self.title

class CourseDetail(models.Model):
    """
    课程详细
    """
    course = models.OneToOneField(to="Course", on_delete=models.CASCADE)
    slogon = models.CharField(verbose_name="口号", max_length=255)
    why = models.CharField(verbose_name="为什么要学？", max_length=255)
    recommend_course = models.ManyToManyField(verbose_name="推荐课程", to="Course", related_name="rc")

    def __str__(self):
        return "课程详细"+self.course.title

class Chapter(models.Model):
    """
    章节
    """
    num = models.IntegerField(verbose_name="章节")
    name = models.CharField(verbose_name="章节名称",max_length=32)
    course = models.ForeignKey(verbose_name="所属课程", to="Course", on_delete=models.CASCADE)

    def __str__(self):
        return self.name

models.py