Book Image

Web Development with Django - Second Edition

By : Ben Shaw, Saurabh Badhwar, Chris Guest, Bharath Chandra K S
4.7 (3)
Book Image

Web Development with Django - Second Edition

4.7 (3)
By: Ben Shaw, Saurabh Badhwar, Chris Guest, Bharath Chandra K S

Overview of this book

Do you want to develop reliable and secure applications that stand out from the crowd without spending hours on boilerplate code? You’ve made the right choice trusting the Django framework, and this book will tell you why. Often referred to as a “batteries included” web development framework, Django comes with all the core features needed to build a standalone application. Web Development with Django will take you through all the essential concepts and help you explore its power to build real-world applications using Python. Throughout the book, you’ll get the grips with the major features of Django by building a website called Bookr – a repository for book reviews. This end-to-end case study is split into a series of bitesize projects presented as exercises and activities, allowing you to challenge yourself in an enjoyable and attainable way. As you advance, you'll acquire various practical skills, including how to serve static files to add CSS, JavaScript, and images to your application, how to implement forms to accept user input, and how to manage sessions to ensure a reliable user experience. You’ll cover everyday tasks that are part of the development cycle of a real-world web application. By the end of this Django book, you'll have the skills and confidence to creatively develop and deploy your own projects.
Table of Contents (19 chapters)

ModelForms and file uploads

We’ve seen how using form.ImageField on a form can prevent non-images from being uploaded. We’ve also seen how models.ImageField makes it easy to store an image for a model. But we need to be aware that Django does not stop you from setting a non-image file to ImageField. For example, consider a form that has both FileField and ImageField:

class ExampleForm(forms.Form):
    uploaded_file = forms.FileField()
    uploaded_image = forms.ImageField()

In the following view, the form would not validate if the uploaded_image field on the form was not an image, so some data validity is ensured for uploaded data. The following is an example of this:

def view(request):
    form = ExampleForm(request.POST, request.FILES)
    if form.is_valid():
        m = ExampleModel()
        m.file_field...