我有3个模型,每3个模型是相互依赖的。当我选择学生姓名时通过表格添加Studentfee模型时,课程价格应该只与该学生的课程选择有关
models.py
from django.db import models
from django.db.models import CASCADE
class Course(models.Model):
title = models.CharField(max_length=250)
basic_price = models.CharField(max_length=100)
advanced_price = models.CharField(max_length=100)
basic_duration = models.CharField(max_length=50)
advanced_duration = models.CharField(max_length=50)
def __str__(self):
return self.title
class Student(models.Model):
name = models.CharField(max_length=100)
courses = models.ManyToManyField(Course)
address = models.CharField(max_length=200)
email = models.EmailField()
phone = models.CharField(max_length=15)
image = models.ImageField(upload_to='Students',blank=True)
joined_date = models.DateField()
def __str__(self):
return self.name
class StudentFee(models.Model):
student = models.ForeignKey(Student,on_delete=CASCADE)
total_fee = models.ForeignKey(Course,on_delete=CASCADE) # should dynamically generate in the form based on the selection of student.how ??
first_installment = models.IntegerField(blank=True)
second_installment = models.IntegerField(blank=True)
third_installment = models.IntegerField(blank=True)
remaining = models.IntegerField(blank=True)
def __str__(self):
return self.total_fee
答案 0 :(得分:0)
我认为您正在处理有关应该计算什么和应该存储什么的问题。
我认为您将需要另一个模型来管理此问题,例如
CourseSelection
,费用应在付款时计算,然后存储为CourseSelectionPayment