Django의 Many to Many 관계를 through로 확장시킨 후 정렬 기준을 many to many의 특정 필드 값으로 하고 싶을 경우
class Student(models.Model):
    images = models.ManyToManyField("StudentImage", related_name="students", blank=True, through="StudentImages")
    class Meta:
        db_table = "student"
class StudentImage(models.Model):
	
    ...
    ..
 
    class Meta:
        db_table = "student_image"
        
        
        
        ordering = ('student_images_ord_no__ord_no',)
class StudentImages(models.Model):
	
    ...
    ..
    postimage = models.ForeignKey("StudentImage", on_delete=models.CASCADE, related_name="student_images_ord_no")
    ord_no = models.IntegerField(blank=True, null=True)
    class Meta:
        db_table = "student_images"
        ordering = ("ord_no",)