value_object | A very small library for immutable value objects in Ruby

    def element_detail(request):
        designated_object = Designated.objects.all()
        element_object = Element.objects.all()
        value_object = Value.objects.all()
        product = Product.objects.all()
    
        if request.method == "POST":
                product_id = request.POST.get('value_code') # new
                product = Product.objects.get(product_code=product_id) # new
# Or 
        #product_ids = request.POST.getlist('value_code')
        #products = Product.objects.filter(product_code__in=product_ids)
        #loop all products and save example;
        #for product in products:
        #   join = Join()
        #   join.product_code = product
        #   join.username = request.user
        #   join.part_date = timezone.now()
        #   join.save()
                join = Join()
                join.product_code = product
                join.username = request.user
                join.part_date = timezone.now()
                join.save()
    
    
                return render(request, 'zeronine/list.html')