Book Image

Django Project Blueprints

By : Asad Jibran Ahmed
Book Image

Django Project Blueprints

By: Asad Jibran Ahmed

Overview of this book

Django is a high-level web framework that eases the creation of complex, database-driven websites. It emphasizes on the reusability and pluggability of components, rapid development, and the principle of don't repeat yourself. It lets you build high-performing, elegant web applications quickly. There are several Django tutorials available online, which take as many shortcuts as possible, but leave you wondering how you can adapt them to your own needs. This guide takes the opposite approach by demonstrating how to work around common problems and client requests, without skipping the important details. If you have built a few Django projects and are on the lookout for a guide to get you past the basics and to solve modern development tasks, this is your book. Seven unique projects will take you through the development process from scratch, leaving no stone unturned. In the first two projects, you will learn everything from adding ranking and voting capabilities to your App to building a multiuser blog platform with a unique twist. The third project tackles APIs with Django and walks us through building a Nagios-inspired infrastructure monitoring system. And that is just the start! The other projects deal with customizing the Django admin to create a CMS for your clients, translating your web applications to multiple languages, and using the Elasticsearch search server with Django to create a high performing e-commerce web site. The seventh chapter includes a surprise usage of Django, and we dive deep into the internals of Django to create something exciting! When you're done, you'll have consistent patterns and techniques that you can build on for many projects to come.
Table of Contents (15 chapters)
Django Project Blueprints
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Showing triggered alerts on the status page


As I said before, we want our users to see any nodes that have an alert triggered highlighted on the status page. Say that they defined an alert for when the disk usage on any node goes beyond 0.85 and the latest data point that we have for dbmaster disk usage has the value 0.9. When the user visits the status page, we would like the row showing the disk usage of the dbmaster node to be highlighted in red so that the user is immediately aware of the alert and is able to take actions to correct this.

Change StatusView in data_collector/view.py to match the following code. The changed bits are highlighted:

class StatusView(TemplateView):
    template_name = 'status.html'

    def get_context_data(self, **kwargs):
        ctx = super(StatusView, self).get_context_data(**kwargs)

        alerts = Alert.objects.filter(is_active=True)

        nodes_and_data_types = DataPoint.objects.all().values('node_name', 'data_type').distinct()

        status_data_dict...