auto-populate Model-B with Model-A and/or Model-C

[user-django]

firstly abstractly speaking - each time i create an order via Model A i want to auto-populate Model B with the data from Model-A and/or Model-C.

now straight to the point - i want both, the customer's name & the product (which they are purchasing) to automatically appear as a concatenated string in the third model, a different one.

class Customer name = models.CharField(max_length=200, null=True)
plus
class Product name = models.CharField(max_length=200, null=True)
equals to
class Account... customer + product

how to achieve this ?


here are my main files.

models.py

from django.db import models

# Create your models here.

class CustomerKlase(models.Model):

    name = models.CharField(max_length=200, null=True)

    phone = models.CharField(max_length=200, null=True)

    email = models.CharField(max_length=200, null=True)

    dateCreated = models.DateTimeField(auto_now_add=True)

    def __str__(self):

        return '{}'.format(self.name)

class TagKlase(models.Model):

    name = models.CharField(max_length=200, null=True)

    def __str__(self):

        return '{},'.format(self.name)

class ProductKlase(models.Model):

    THE_CATEGORY = (

        ("Indoor0","Indoor1"),

        ("Outdoor0","Outdoor1")

        )

    name = models.CharField(max_length=200, null=True)

    price = models.FloatField(null=True)

    category = models.CharField(max_length=200, null=True, choices=THE_CATEGORY, blank=True)

    description = models.CharField(max_length=200, null=True, blank=True)

    dateCreated = models.DateTimeField(auto_now_add=True)

    tags = models.ManyToManyField(TagKlase)

    def __str__(self):

        return '{}'.format(self.name)

class AccountKlase(models.Model):

    customer = models.ForeignKey(CustomerKlase, null=True, on_delete=models.SET_NULL)

    product = models.ForeignKey(ProductKlase, null=True, on_delete=models.SET_NULL)

    def __str__(self):

        return '{} & {}'.format(self.customer, self.product)

class OrderKlase(models.Model):

    THE_STATUS = (

        ("Pending-0","Pending-1"),

        ("Out for delivery 0","Out for delivery 1"),

        ("delivered-0","delivered-1")

        )

    customer = models.ForeignKey(CustomerKlase, null=True, on_delete=models.SET_NULL)

    product = models.ForeignKey(ProductKlase, null=True, on_delete=models.SET_NULL)

    account = models.ForeignKey(AccountKlase, null=True, on_delete=models.SET_NULL)

    dateCreated = models.DateTimeField(auto_now_add=True)

    status = models.CharField(max_length=200, null=True, choices=THE_STATUS)

    def __str__(self):

        return '{}'.format(self.account)

views.py

from django.shortcuts import render

# Create your views here.

from .models import *

def homepageFuncte(request):

    return render(request, "myapp1/my-templates/homepage.html")

def productsFuncte(request):

    products = ProductKlase.objects.all()

    context = {"my_Products":products}

    return render(request, "myapp1/my-templates/products.html", context)

def customersFuncte(request):

    customers = CustomerKlase.objects.all()

    context = {"my_Customers":customers}

    return render(request, "myapp1/my-templates/customers.html", context)

def ordersFuncte(request):

    orders = OrderKlase.objects.all()

    #customers = orders.customerklase_set.all()[0]#"customers":customers, 

    context = {"my_Orders":orders}

    return render(request, "myapp1/my-templates/orders.html", context)