Как я могу вставить значения в базу данных, которые будут получены из модели Category, Seller и Origin в django?

'''Я создал отношения внешнего ключа в продукте, приписанном к категории, продавцу и происхождению, но не смог сохранить и получить значения'''

models.py

from django.db import models
from django.contrib.auth.models import User
#from django.db import Seller
# Create your models here.

class Category(models.Model):
    category_name = models.CharField(max_length=10)

    def __str__(self):
        return self.category_name


class Origin(models.Model):
    origin_name = models.CharField(max_length=10,default=1)
    
    def __str__(self):
        return self.origin_name


class Seller(models.Model):
    seller_name = models.OneToOneField(User, on_delete=models.CASCADE,default=1)

    def __str__(self):
        return self.seller_name.username


class Product(models.Model):
    product_code = models.CharField(max_length=20)
    product_name = models.CharField(max_length=20)
    product_category = models.ForeignKey(Category, on_delete=models.CASCADE,null=True,related_name='cat',blank=True)
    product_quantity = models.PositiveBigIntegerField(null=True)
    product_seller = models.ForeignKey(Seller, on_delete=models.CASCADE,null=True,related_name='seller',blank=True)
    product_purchase_price =models.PositiveIntegerField(null=True)
    product_selling_price = models.PositiveIntegerField(null=True)
    product_origin = models.ForeignKey(Origin, on_delete=models.CASCADE,null=True,related_name='origin',blank=True)
    #product_image = m
    #profit_percentage = models.PositiveIntegerField(null=True)

    def __str__(self):
        return self.product_name

Вот views.py vile. Подскажите, пожалуйста, где я должен внести изменения? Я хочу вставить данные без использования файла forms.py. '''

views.py

from django.http.response import HttpResponse
from django.shortcuts import render
from django.contrib.auth.models import User
from .models import Product,Category, Seller, Origin
from django.contrib.auth import authenticate, login, logout
# from .models import *
# Create your views here.

def add_product(request):
    cat=Category.objects.all()

    sell=Seller.objects.all()
    ori=Origin.objects.all()
    if request.method=="POST":
        product_code=request.POST['product_code']
        product_name=request.POST['product_name']
        product_category=request.POST.get('product_category')
        product_quantity=request.POST['product_quantity']
        product_seller=request.POST.get('product_seller')
        product_purchase_price=request.POST['product_purchase_price']
        product_selling_price=request.POST['product_selling_price']
        product_origin=request.POST.get('product_origin')
        if Product.objects.filter(product_code=product_code).exists():
            return HttpResponse('This Product has already taken. Please Try another Product')
        else:
            new_product=Product(
            product_code=product_code, 
            product_name=product_name,
            product_quantity=product_quantity, 
            product_purchase_price=product_purchase_price, 
            product_selling_price=product_selling_price,
            product_category=product_category,
            product_seller=product_seller,
        
            product_origin=product_origin,
            
            
            )
            new_product.save()
            return HttpResponse('Your Product has successfully Added')
    con={
        'c': cat,
        's': sell,
        'o': ori,
    }
    return render(request, 'product/product_add.html',con)

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