Django model field constraint content-CodePudding

A teacher's table, a class list

 
The class the 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 (the Teacher, 
On_delete=models. PROTECT, 
Related_name='teacher_c') 
Teacher_math=models. ForeignKey (the Teacher, 
On_delete=models. PROTECT, 
Related_name='teacher_m') 
Teacher_english=models. ForeignKey (the Teacher, 
On_delete=models. PROTECT, 
Related_name='teacher_e') 

The class Meta: 
Unique_together=(' grade ', 'class_no)

Class teacher_chinese can only is the teacher of the subject in the table is the Chinese teacher
How do I achieve?

CodePudding user response:

When inserting data to judgment