一張教師表，一張班級表
class Teacher(models.Model):
name = models.CharField(max_length=10)
subject = models.CharField(max_length=10)
class Classname(models.Model):
grade = models.CharField(max_length=10)
class_no = models.PositiveSmallIntegerField()
teacher_chinese = models.ForeignKey(Teacher,
on_delete=models.PROTECT,
related_name='teacher_c')
teacher_math = models.ForeignKey(Teacher,
on_delete=models.PROTECT,
related_name='teacher_m')
teacher_english = models.ForeignKey(Teacher,
on_delete=models.PROTECT,
related_name='teacher_e')
class Meta:
unique_together = ('grade', 'class_no')
班級的teacher_chinese只能是teacher表中subject是語文的老師
請問如何實作？
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