Django-Compressor Tricks and Gotchas | Snakey Code
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Django-Compressor Tricks and Gotchas
Although it looks simple enough, getting Django-Compressor working is a little tricky. Here are my notes.
Do Not Nest {% Compress %} Blocks
This one comes from https://blog.imposeren.org/2012/10/django-compressor-notes-and-tricks.html
If you accidentally nest blocks you will get an error like this:
You have offline compression enabled but key "%s" is missing from offline manifest.
Make Sure Your Server is Setup to Server GZIP
If you do offline compression, then django-compressor will create a minified file and a compressed (*.gz) file. The content on your page will point to the minified file. It is up to your server to send the *.gz version when the minified version is requested.
In nginx, the setting that does that is:
location / {
gzip_static on;
}
To make sure the gzip version is being used, make sure the “Content-Encoding” of the response header is “gzip”.
Test Run “compress” Locally
One of the tricky things about using django-compressor is it is off when DEBUG is True. This means you can have problems with your *.html files and not know about them until you push them to a server.
In order to find those errors, I have a settings file that is my dev settings along with DEBUG=False and the COMPRESS settings from production. This allows the “compress” command to be run locally.
Beware of Context Variables in your Javascript
This is an easy mistake to make. Maybe your page has a dynamic link and you are using something like:
const url = "{% url 'my_url' var1 %}";
The problem with this is var1 is not defined at the time the offline compression is done. There are lots of ways to handle this, including using some of the django-compressor settings.
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