How create custom template tags and use Forms?

I create custom django template and used Form (this tag has to be universal):

This is file ratings.py use tags:

from django import template

from django.contrib.contenttypes.models import ContentType

from Ratings.forms import RatingsForm

register = template.Library()

class RatingFormNode(template.Node):

    def __init__(self, content, id, varname):

        self.content = content.split('.')

        self.varname = varname

        self.id = template.Variable(id)

    def render(self, context):

        id = self.id.resolve(context)

        content = ContentType.objects.get(app_label=self.content[0], model=str(self.content[1]).lower())

        context[self.varname] = RatingsForm(initial={'content_type': content, 'object_id': id})

        return ''

@register.tag(name='rating')

def rating(parser, token):

    """

    {% rating appname.Modelname 1 as Newsletter_Form %}

    """

    bits = token.split_contents()

    if bits[3] != 'as':

        raise template.TemplateSyntaxError, "third argument to the get_latest tag must be 'as'"

    return RatingFormNode(bits[1], bits[2], bits[4])

and I use this tag in tempalte file:

{% rating appname.Modelname id as rating_form %}

<form action="{% url 'ratings_add' %}" method="POST">

    {% csrf_token %}

    {{ rating_form }}

    <input type="hidden" name="url" value="{{ post.slug }}" />

    <input type="submit" value="Wyślij" />

</form>

 

this is urls.py:

from django.conf.urls import patterns, url

urlpatterns = patterns('Ratings.views',

    url(r'^add/$', 'ratings_add', name='ratings_add'),

)

 

and create views to get the url:

# -*- coding: utf-8 -*-

from django.core.urlresolvers import reverse

from django.http.response import Http404

from django.http import HttpResponseRedirect

from django.shortcuts import redirect

from Ratings.forms import RatingsForm

def ratings_add(request):

    if not request.method == 'POST':

        return Http404

    form = RatingsForm(request.POST)

    if form.is_valid():

        form.save()

        return HttpResponseRedirect(reverse('post', args=[request.POST.get('url')]))

    else:

        request.session['form_data'] = request.POST

        return redirect(reverse('post', args=[request.POST.get('url')]), form=form)

 

I use this tag in the template with the url: "/post/name-this-post/". Tag creates a form of "RatingForm" of the model "Rating". When the person viewing your page and use the form and form is valid this is work (save form and redirect to page "/post/name-this-post/"), but when an error occurs, you are redirected but does not display an error. How do I fix this?

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