Question

我想创建一个依赖项下拉列表以获取结果和学生表。

从学生模型中，我必须在页面的下拉列表中获得可用的批次。
，然后在第二个下拉列表中获取对应/取决于批次的可用课程。
如果我点击“提交”，它将显示所有具有相同条件的学生的列表在页面中的所选课程上批量处理和显示其结果
列表项

我的models.py是：

from django.db import models
from django.contrib.auth.models import User
from django.urls import reverse
from django.db.models.signals import post_save
from django.dispatch import receiver
from django.core.validators import RegexValidator
from smart_selects.db_fields import ChainedForeignKey
class Course(models.Model):
    cid = models.AutoField(primary_key=True)
    cnam = models.CharField(max_length=200)
    cidn = models.IntegerField()
    cred = models.IntegerField()

    def __str__(self):
        return 'IT-' + str(self.cidn) + ' - ' + self.cnam

class Student(models.Model):
    snam = models.CharField(max_length=200)
    sid = models.AutoField(primary_key=True)
    sroll = models.IntegerField()
    sreg = models.IntegerField()
    sbtc = models.IntegerField()
    sses = models.CharField(max_length=10)

    def __str__(self):
        return self.snam

class Teacher(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    phone_regex = RegexValidator(regex=r'^\0?1?\d{11}$')
    mobile = models.CharField(validators=[phone_regex], max_length=11, blank=True)
    avatar = models.ImageField(upload_to='avater', blank=True)

    def __str__(self):
        return self.user.first_name + ' '+self.user.last_name

    @receiver(post_save, sender=User)
    def create_user_profile(sender, instance, created, **kwargs):
        if created:
            Teacher.objects.create(user=instance)

    @receiver(post_save, sender=User)
    def save_user_profile(sender, instance, **kwargs):
        instance.teacher.save()

class Session(models.Model):
    sesid = models.IntegerField(primary_key=True,verbose_name= ('Session'))

    def __str__(self):
        return str(self.sesid)
    def get_absolute_url(self):
        return reverse('Dashboard:session')

class Registration(models.Model):
    session = models.ForeignKey(Session, on_delete=models.CASCADE)
    teacher = models.ForeignKey(Teacher, on_delete=models.CASCADE, null=True)
    course = models.ForeignKey(Course, on_delete=models.CASCADE)

    def get_absolute_url(self):
        return reverse("Dashboard:session")

    def __str__(self):
        return str(self.session) + " - " + self.course.cnam + " - " +self.teacher.user.first_name + ' '+self.teacher.user.last_name

class Result(models.Model):
    reg = models.ForeignKey(Registration, on_delete=models.CASCADE, null=True)
    student = models.ForeignKey(Student, on_delete=models.CASCADE, null=True)
    ct1 = models.FloatField(null=True, blank=True)
    ct2 = models.FloatField(null=True, blank=True)
    ct3 = models.FloatField(null=True, blank=True)
    asn = models.FloatField(null=True, blank=True)
    # avg
    atd = models.IntegerField(null=True, blank=True)
    #total
    def __str__(self):
        return str(self.reg.session) + ' - ' + 'IT-' + str(self.reg.course.cidn) + ' - ' + self.student.snam

如何从两个不同的模型在Django中创建依赖下拉框？

0 个答案: