How to create "form" from "model" with 2 foreign keys?

'''
REFERENCE: https://stackoverflow.com/questions/53091688/modeling-product-orders-in-django
'''


from django.db import models
from django.utils import timezone
from django.core.validators import RegexValidator


import datetime


# Create your models here.
class Customer(models.Model):
name = models.CharField(max_length=50)

phone_regex = RegexValidator(regex='^\+?1?\d{9,15}$', message="Phone number must be entered in the format: '+999999999'. Up to 15 digits allowed.")
phone_number = models.CharField(validators=[phone_regex], max_length=17, blank=False)

email = models.EmailField(max_length=254)
dob = models.DateField(blank=True)

def __str__(self):
return self.name


class Product(models.Model):
item_name = models.CharField(max_length=255)
price = models.PositiveIntegerField()

def __str__(self):
return self.item_name


class OrderDetail(models.Model):
order = models.ForeignKey(Customer, on_delete=models.CASCADE)
product = models.ForeignKey(Product, on_delete=models.CASCADE)
quantity = models.PositiveIntegerField(default=1)
order_date_time = models.DateTimeField()

def __str__(self):
return self.order.name

Context: I'm new to Django. I've just completed the tutorial on the Docs page. I'm trying to make a coffee ordering application. Basically a person has to enter his details and select coffee along with number of cups.

Now a person may select 2 or 3 of the same type of coffee, or he may select multiple coffee types.

I've attached my models.py file. How do i make a form for this mode?

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