Андрей Воскресенский

class Blog (models.Model):
    title = models.CharField(max_length=100, verbose_name="Все категории")

    def __str__(self):
        return self.title

def add_product_to_cart(request):
	if request.method == 'POST':
		id = int(request.POST['product_id'])
		if 'cart' not in request.session:
			request.session['cart'] = []
		request.session['cart'].append(int(id))
		request.session.modified = True
		return redirect("/")

def show_cart(request):
	cart = request.session.get('cart')
	product_items = Product.objects.filter(id__in=cart) #можно и так Product.objects.filter(id__in=request.session['cart'])
	content={
		"product_items":product_items
	}
	return render (request, "orderdetail.html", content)

def add_product_to_cart(request):
	if request.method == 'POST':
		id = int(request.POST['product_id'])
		price = int(request.POST['price'])
		if 'cart' not in request.session:
			request.session['cart'] = []
		request.session['cart'].append(dict({'product_id': id, 'price': price}))
		request.session.modified = True
		return redirect("/")

def show_cart(request):
	cart = request.session.get('cart')
	product_items = Product.objects.filter(id__in=(x['product_id'] for x in cart) )#можно прописать и для price вот только фактически это не нужно...
	content={
		"product_items":product_items
	}
	return render (request, "orderdetail.html", content)

from django.contrib import messages

def feedback(request):
    form = FeedbackForm(request.POST or None)
    if form.is_valid():
        instance = form.save(commit=False)
        instance.save()
        messages.success(request, 'Ваше сообщение отправлено! Мы свяжемвся с Вами в скором времени!')
        return render(request, "feedback.html")
    context = {
        'form': form,
    }
    return render(request, 'feedback.html', context)

{% for message in messages %}
    <li{% if message.tags %} class="{{ message.tags }}"{% endif %}>{{ message }}</li>
    {% endfor %}

from django.forms import ModelForm
class FeedbackForm(ModelForm):