Uploading files via forms

Uploading files via forms, and doing it properly, is usually a matter of concern for many web frameworks. In this recipe, we will see how Flask and WTForms handle this for us in a simple and streamlined manner.

How to do it...

First, we will start with the configuration bit. We need to provide a parameter to our application configuration, that is, UPLOAD_FOLDER. This parameter tells Flask about the location where our uploaded files will be stored. We will implement a feature to store product images.

One way to store product images can be to store images in a binary type field in our database, but this method is highly inefficient and never recommended in any application. We should always store images...