一、创建表

# 创建班级表
class Grade(models.Model):
    g_name = models.CharField(max_length=16)

# 创建学生表
class Student(models.Model):
    s_name = models.CharField(max_length=16)
    s_grade = models.ForeignKey(Grade,on_delete=models.CASCADE)

 

二、查询

# 跨关系查询,查询姓名为mozili所在的班级
def get_grade(request):
    grades = Grade.objects.all().filter(student__s_name='mozili')
    context = {
        'grades':grades,
    }

    return render(request, 'grade.html',context=context)