Django snippets

#models.py
from datetime import datetime
from django.db import models
from django.utils.translation import gettext_lazy as _

class MotdMessageManager(models.Manager):
    def active_messages(self):
        dtnow = datetime.utcnow()
        return super(MotdMessageManager, self).get_query_set().filter(
            enabled=True, start_time__lte=dtnow, end_time__gte=dtnow)

class MotdMessage(models.Model):
    enabled = models.BooleanField(default=True)
    start_time = models.DateTimeField()
    end_time = models.DateTimeField()
    name = models.CharField(_('name'), unique=True, max_length=100)
    content = models.TextField(_('content'), blank=True)
    
    objects = MotdMessageManager()
    
    class Meta:
        ordering = ['start_time']
    
    def __unicode__(self):
        return self.name


#views.py
from django.contrib.auth import REDIRECT_FIELD_NAME
from django.conf import settings
from django.http import HttpResponseRedirect
from django.shortcuts import render_to_response
from django.template import RequestContext
from models import MotdMessage

def motd(request, template_name='motd/messages.html', redirect_field_name=REDIRECT_FIELD_NAME):
    redirect_to = request.REQUEST.get(redirect_field_name, '')
    if not redirect_to or '//' in redirect_to or ' ' in redirect_to:
        redirect_to = settings.LOGIN_REDIRECT_URL
    messages = MotdMessage.objects.active_messages()
    if not messages:
        return HttpResponseRedirect(redirect_to)
    return render_to_response(template_name, {redirect_field_name: redirect_to,
                'messages': messages}, context_instance=RequestContext(request))

#admin.py
from django.contrib import admin
import models

admin.site.register(models.MotdMessage)

#templates/motd/messages.html
{% extends "base.html" %}

{% block content %}

{% for message in messages %}
<h2>{{ message.name }}</h2>
<p>{{ message.content|safe }}</p>
<br/>
{% endfor %}

<a href="{{ next }}">Continue</a>

{% endblock %}